mirror of
https://github.com/postgres/postgres.git
synced 2025-11-03 00:08:23 -05:00
First cut at implementing IN (and NOT IN) via hashtables. There is
more to be done yet, but this is a good start.
This commit is contained in:
Tom Lane
parent
3e54e26bcf
commit
19b886332a
@ -8,7 +8,7 @@
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*
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*
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* IDENTIFICATION
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* $Header: /cvsroot/pgsql/src/backend/executor/execGrouping.c,v 1.1 2003/01/10 23:54:24 tgl Exp $
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* $Header: /cvsroot/pgsql/src/backend/executor/execGrouping.c,v 1.2 2003/01/12 04:03:34 tgl Exp $
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*
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*-------------------------------------------------------------------------
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*/
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@ -23,17 +23,14 @@
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/*****************************************************************************
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* Utility routines for grouping tuples together
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*
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* These routines actually implement SQL's notion of "distinct/not distinct".
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* Two tuples match if they are not distinct in all the compared columns,
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* i.e., the column values are either both null, or both non-null and equal.
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*****************************************************************************/
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/*
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* execTuplesMatch
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* Return true if two tuples match in all the indicated fields.
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* This is used to detect group boundaries in nodeGroup and nodeAgg,
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* and to decide whether two tuples are distinct or not in nodeUnique.
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*
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* This actually implements SQL's notion of "not distinct". Two nulls
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* match, a null and a not-null don't match.
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*
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* tuple1, tuple2: the tuples to compare
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* tupdesc: tuple descriptor applying to both tuples
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@ -112,11 +109,88 @@ execTuplesMatch(HeapTuple tuple1,
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return result;
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}
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/*
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* execTuplesUnequal
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* Return true if two tuples are definitely unequal in the indicated
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* fields.
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*
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* Nulls are neither equal nor unequal to anything else. A true result
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* is obtained only if there are non-null fields that compare not-equal.
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*
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* Parameters are identical to execTuplesMatch.
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*/
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bool
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execTuplesUnequal(HeapTuple tuple1,
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HeapTuple tuple2,
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TupleDesc tupdesc,
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int numCols,
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AttrNumber *matchColIdx,
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FmgrInfo *eqfunctions,
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MemoryContext evalContext)
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{
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MemoryContext oldContext;
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bool result;
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int i;
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/* Reset and switch into the temp context. */
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MemoryContextReset(evalContext);
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oldContext = MemoryContextSwitchTo(evalContext);
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/*
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* We cannot report a match without checking all the fields, but we
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* can report a non-match as soon as we find unequal fields. So,
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* start comparing at the last field (least significant sort key).
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* That's the most likely to be different if we are dealing with
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* sorted input.
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*/
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result = false;
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for (i = numCols; --i >= 0;)
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{
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AttrNumber att = matchColIdx[i];
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Datum attr1,
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attr2;
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bool isNull1,
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isNull2;
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attr1 = heap_getattr(tuple1,
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att,
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tupdesc,
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&isNull1);
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if (isNull1)
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continue; /* can't prove anything here */
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attr2 = heap_getattr(tuple2,
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att,
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tupdesc,
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&isNull2);
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if (isNull2)
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continue; /* can't prove anything here */
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/* Apply the type-specific equality function */
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if (!DatumGetBool(FunctionCall2(&eqfunctions[i],
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attr1, attr2)))
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{
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result = true; /* they are unequal */
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break;
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}
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}
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MemoryContextSwitchTo(oldContext);
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return result;
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}
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/*
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* execTuplesMatchPrepare
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* Look up the equality functions needed for execTuplesMatch.
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* The result is a palloc'd array.
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* Look up the equality functions needed for execTuplesMatch or
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* execTuplesUnequal.
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*
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* The result is a palloc'd array.
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*/
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FmgrInfo *
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execTuplesMatchPrepare(TupleDesc tupdesc,
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@ -266,8 +340,13 @@ BuildTupleHashTable(int numCols, AttrNumber *keyColIdx,
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* Find or create a hashtable entry for the tuple group containing the
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* given tuple.
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*
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* On return, *isnew is true if the entry is newly created, false if it
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* existed already. Any extra space in a new entry has been zeroed.
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* If isnew is NULL, we do not create new entries; we return NULL if no
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* match is found.
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*
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* If isnew isn't NULL, then a new entry is created if no existing entry
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* matches. On return, *isnew is true if the entry is newly created,
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* false if it existed already. Any extra space in a new entry has been
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* zeroed.
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*/
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TupleHashEntry
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LookupTupleHashEntry(TupleHashTable hashtable, TupleTableSlot *slot,
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@ -318,27 +397,31 @@ LookupTupleHashEntry(TupleHashTable hashtable, TupleTableSlot *slot,
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hashtable->eqfunctions,
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hashtable->tempcxt))
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{
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if (isnew)
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*isnew = false;
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MemoryContextSwitchTo(oldContext);
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*isnew = false;
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return entry;
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}
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}
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/* Not there, so build a new one */
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MemoryContextSwitchTo(hashtable->tablecxt);
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/* Not there, so build a new one if requested */
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if (isnew)
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{
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MemoryContextSwitchTo(hashtable->tablecxt);
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entry = (TupleHashEntry) palloc0(hashtable->entrysize);
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entry = (TupleHashEntry) palloc0(hashtable->entrysize);
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entry->hashkey = hashkey;
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entry->firstTuple = heap_copytuple(tuple);
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entry->hashkey = hashkey;
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entry->firstTuple = heap_copytuple(tuple);
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entry->next = hashtable->buckets[bucketno];
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hashtable->buckets[bucketno] = entry;
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entry->next = hashtable->buckets[bucketno];
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hashtable->buckets[bucketno] = entry;
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*isnew = true;
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}
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MemoryContextSwitchTo(oldContext);
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*isnew = true;
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return entry;
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}
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@ -8,7 +8,7 @@
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*
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*
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* IDENTIFICATION
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* $Header: /cvsroot/pgsql/src/backend/executor/execQual.c,v 1.122 2003/01/10 21:08:07 tgl Exp $
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* $Header: /cvsroot/pgsql/src/backend/executor/execQual.c,v 1.123 2003/01/12 04:03:34 tgl Exp $
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*
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*-------------------------------------------------------------------------
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*/
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@ -2324,8 +2324,13 @@ ExecCleanTargetListLength(List *targetlist)
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/* ----------------------------------------------------------------
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* ExecTargetList
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*
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* Evaluates a targetlist with respect to the current
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* expression context and return a tuple.
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* Evaluates a targetlist with respect to the given
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* expression context and returns a tuple.
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*
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* The caller must pass workspace for the values and nulls arrays
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* as well as the itemIsDone array. This convention saves palloc'ing
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* workspace on each call, and some callers may find it useful to examine
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* the values array directly.
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*
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* As with ExecEvalExpr, the caller should pass isDone = NULL if not
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* prepared to deal with sets of result tuples. Otherwise, a return
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@ -2335,21 +2340,15 @@ ExecCleanTargetListLength(List *targetlist)
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*/
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static HeapTuple
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ExecTargetList(List *targetlist,
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int nodomains,
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TupleDesc targettype,
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Datum *values,
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ExprContext *econtext,
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Datum *values,
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char *nulls,
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ExprDoneCond *itemIsDone,
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ExprDoneCond *isDone)
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{
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MemoryContext oldContext;
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#define NPREALLOCDOMAINS 64
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char nullsArray[NPREALLOCDOMAINS];
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ExprDoneCond itemIsDoneArray[NPREALLOCDOMAINS];
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char *nulls;
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ExprDoneCond *itemIsDone;
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List *tl;
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HeapTuple newTuple;
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bool isNull;
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bool haveDoneSets;
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static struct tupleDesc NullTupleDesc; /* we assume this inits to
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@ -2378,31 +2377,9 @@ ExecTargetList(List *targetlist,
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if (targettype == NULL)
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targettype = &NullTupleDesc;
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/*
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* allocate an array of char's to hold the "null" information only if
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* we have a really large targetlist. otherwise we use the stack.
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*
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* We also allocate another array that holds the isDone status for each
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* targetlist item. The isDone status is needed so that we can iterate,
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* generating multiple tuples, when one or more tlist items return
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* sets. (We expect the caller to call us again if we return
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* isDone = ExprMultipleResult.)
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*/
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if (nodomains > NPREALLOCDOMAINS)
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{
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nulls = (char *) palloc(nodomains * sizeof(char));
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itemIsDone = (ExprDoneCond *) palloc(nodomains * sizeof(ExprDoneCond));
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}
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else
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{
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nulls = nullsArray;
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itemIsDone = itemIsDoneArray;
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}
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/*
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* evaluate all the expressions in the target list
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*/
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if (isDone)
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*isDone = ExprSingleResult; /* until proven otherwise */
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@ -2451,8 +2428,7 @@ ExecTargetList(List *targetlist,
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*/
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*isDone = ExprEndResult;
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MemoryContextSwitchTo(oldContext);
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newTuple = NULL;
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goto exit;
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return NULL;
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}
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else
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{
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@ -2511,8 +2487,7 @@ ExecTargetList(List *targetlist,
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}
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MemoryContextSwitchTo(oldContext);
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newTuple = NULL;
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goto exit;
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return NULL;
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}
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}
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}
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@ -2522,20 +2497,7 @@ ExecTargetList(List *targetlist,
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*/
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MemoryContextSwitchTo(oldContext);
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newTuple = (HeapTuple) heap_formtuple(targettype, values, nulls);
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exit:
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/*
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* free the status arrays if we palloc'd them
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*/
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if (nodomains > NPREALLOCDOMAINS)
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{
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pfree(nulls);
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pfree(itemIsDone);
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}
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return newTuple;
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return heap_formtuple(targettype, values, nulls);
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}
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/* ----------------------------------------------------------------
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@ -2555,11 +2517,7 @@ TupleTableSlot *
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ExecProject(ProjectionInfo *projInfo, ExprDoneCond *isDone)
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{
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TupleTableSlot *slot;
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List *targetlist;
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int len;
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TupleDesc tupType;
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Datum *tupValue;
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ExprContext *econtext;
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HeapTuple newTuple;
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/*
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@ -2572,21 +2530,17 @@ ExecProject(ProjectionInfo *projInfo, ExprDoneCond *isDone)
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* get the projection info we want
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*/
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slot = projInfo->pi_slot;
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targetlist = projInfo->pi_targetlist;
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len = projInfo->pi_len;
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tupType = slot->ttc_tupleDescriptor;
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tupValue = projInfo->pi_tupValue;
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econtext = projInfo->pi_exprContext;
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/*
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* form a new result tuple (if possible --- result can be NULL)
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*/
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newTuple = ExecTargetList(targetlist,
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len,
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newTuple = ExecTargetList(projInfo->pi_targetlist,
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tupType,
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tupValue,
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econtext,
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projInfo->pi_exprContext,
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projInfo->pi_tupValues,
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projInfo->pi_tupNulls,
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projInfo->pi_itemIsDone,
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isDone);
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/*
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@ -8,7 +8,7 @@
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*
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*
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* IDENTIFICATION
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* $Header: /cvsroot/pgsql/src/backend/executor/execUtils.c,v 1.94 2002/12/18 00:14:47 tgl Exp $
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* $Header: /cvsroot/pgsql/src/backend/executor/execUtils.c,v 1.95 2003/01/12 04:03:34 tgl Exp $
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*
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*-------------------------------------------------------------------------
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*/
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@ -475,29 +475,51 @@ ExecGetResultType(PlanState *planstate)
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return slot->ttc_tupleDescriptor;
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}
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/* ----------------
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* ExecBuildProjectionInfo
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*
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* Build a ProjectionInfo node for evaluating the given tlist in the given
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* econtext, and storing the result into the tuple slot. (Caller must have
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* ensured that tuple slot has a descriptor matching the tlist!) Note that
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* the given tlist should be a list of ExprState nodes, not Expr nodes.
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* ----------------
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*/
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ProjectionInfo *
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ExecBuildProjectionInfo(List *targetList,
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ExprContext *econtext,
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TupleTableSlot *slot)
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{
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ProjectionInfo *projInfo = makeNode(ProjectionInfo);
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int len;
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len = ExecTargetListLength(targetList);
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projInfo->pi_targetlist = targetList;
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projInfo->pi_exprContext = econtext;
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projInfo->pi_slot = slot;
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if (len > 0)
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{
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projInfo->pi_tupValues = (Datum *) palloc(len * sizeof(Datum));
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projInfo->pi_tupNulls = (char *) palloc(len * sizeof(char));
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projInfo->pi_itemIsDone = (ExprDoneCond *) palloc(len * sizeof(ExprDoneCond));
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}
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return projInfo;
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}
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/* ----------------
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* ExecAssignProjectionInfo
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forms the projection information from the node's targetlist
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*
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* forms the projection information from the node's targetlist
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* ----------------
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*/
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void
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ExecAssignProjectionInfo(PlanState *planstate)
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{
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ProjectionInfo *projInfo;
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List *targetList;
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int len;
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targetList = planstate->targetlist;
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len = ExecTargetListLength(targetList);
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projInfo = makeNode(ProjectionInfo);
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projInfo->pi_targetlist = targetList;
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projInfo->pi_len = len;
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projInfo->pi_tupValue = (len <= 0) ? NULL : (Datum *) palloc(sizeof(Datum) * len);
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projInfo->pi_exprContext = planstate->ps_ExprContext;
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projInfo->pi_slot = planstate->ps_ResultTupleSlot;
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planstate->ps_ProjInfo = projInfo;
|
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planstate->ps_ProjInfo =
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ExecBuildProjectionInfo(planstate->targetlist,
|
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planstate->ps_ExprContext,
|
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planstate->ps_ResultTupleSlot);
|
||||
}
|
||||
|
||||
|
||||
|
||||
@ -7,7 +7,7 @@
|
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* Portions Copyright (c) 1994, Regents of the University of California
|
||||
*
|
||||
* IDENTIFICATION
|
||||
* $Header: /cvsroot/pgsql/src/backend/executor/nodeSubplan.c,v 1.42 2003/01/10 21:08:08 tgl Exp $
|
||||
* $Header: /cvsroot/pgsql/src/backend/executor/nodeSubplan.c,v 1.43 2003/01/12 04:03:34 tgl Exp $
|
||||
*
|
||||
*-------------------------------------------------------------------------
|
||||
*/
|
||||
@ -22,11 +22,24 @@
|
||||
#include "access/heapam.h"
|
||||
#include "executor/executor.h"
|
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#include "executor/nodeSubplan.h"
|
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#include "nodes/makefuncs.h"
|
||||
#include "parser/parse_expr.h"
|
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#include "tcop/pquery.h"
|
||||
|
||||
|
||||
static Datum ExecHashSubPlan(SubPlanState *node,
|
||||
ExprContext *econtext,
|
||||
bool *isNull);
|
||||
static Datum ExecScanSubPlan(SubPlanState *node,
|
||||
ExprContext *econtext,
|
||||
bool *isNull);
|
||||
static void buildSubPlanHash(SubPlanState *node);
|
||||
static bool findPartialMatch(TupleHashTable hashtable, TupleTableSlot *slot);
|
||||
static bool tupleAllNulls(HeapTuple tuple);
|
||||
|
||||
|
||||
/* ----------------------------------------------------------------
|
||||
* ExecSubPlan(node)
|
||||
* ExecSubPlan
|
||||
* ----------------------------------------------------------------
|
||||
*/
|
||||
Datum
|
||||
@ -35,6 +48,155 @@ ExecSubPlan(SubPlanState *node,
|
||||
bool *isNull)
|
||||
{
|
||||
SubPlan *subplan = (SubPlan *) node->xprstate.expr;
|
||||
|
||||
if (subplan->setParam != NIL)
|
||||
elog(ERROR, "ExecSubPlan: can't set parent params from subquery");
|
||||
|
||||
if (subplan->useHashTable)
|
||||
return ExecHashSubPlan(node, econtext, isNull);
|
||||
else
|
||||
return ExecScanSubPlan(node, econtext, isNull);
|
||||
}
|
||||
|
||||
/*
|
||||
* ExecHashSubPlan: store subselect result in an in-memory hash table
|
||||
*/
|
||||
static Datum
|
||||
ExecHashSubPlan(SubPlanState *node,
|
||||
ExprContext *econtext,
|
||||
bool *isNull)
|
||||
{
|
||||
SubPlan *subplan = (SubPlan *) node->xprstate.expr;
|
||||
PlanState *planstate = node->planstate;
|
||||
ExprContext *innerecontext = node->innerecontext;
|
||||
TupleTableSlot *slot;
|
||||
HeapTuple tup;
|
||||
|
||||
/* Shouldn't have any direct correlation Vars */
|
||||
if (subplan->parParam != NIL || node->args != NIL)
|
||||
elog(ERROR, "ExecHashSubPlan: direct correlation not supported");
|
||||
|
||||
/*
|
||||
* If first time through or we need to rescan the subplan, build
|
||||
* the hash table.
|
||||
*/
|
||||
if (node->hashtable == NULL || planstate->chgParam != NIL)
|
||||
buildSubPlanHash(node);
|
||||
|
||||
/*
|
||||
* The result for an empty subplan is always FALSE; no need to
|
||||
* evaluate lefthand side.
|
||||
*/
|
||||
*isNull = false;
|
||||
if (!node->havehashrows && !node->havenullrows)
|
||||
return BoolGetDatum(false);
|
||||
|
||||
/*
|
||||
* Evaluate lefthand expressions and form a projection tuple.
|
||||
* First we have to set the econtext to use (hack alert!).
|
||||
*/
|
||||
node->projLeft->pi_exprContext = econtext;
|
||||
slot = ExecProject(node->projLeft, NULL);
|
||||
tup = slot->val;
|
||||
|
||||
/*
|
||||
* Note: because we are typically called in a per-tuple context,
|
||||
* we have to explicitly clear the projected tuple before returning.
|
||||
* Otherwise, we'll have a double-free situation: the per-tuple context
|
||||
* will probably be reset before we're called again, and then the tuple
|
||||
* slot will think it still needs to free the tuple.
|
||||
*/
|
||||
|
||||
/*
|
||||
* Since the hashtable routines will use innerecontext's per-tuple
|
||||
* memory as working memory, be sure to reset it for each tuple.
|
||||
*/
|
||||
ResetExprContext(innerecontext);
|
||||
|
||||
/*
|
||||
* If the LHS is all non-null, probe for an exact match in the
|
||||
* main hash table. If we find one, the result is TRUE.
|
||||
* Otherwise, scan the partly-null table to see if there are any
|
||||
* rows that aren't provably unequal to the LHS; if so, the result
|
||||
* is UNKNOWN. (We skip that part if we don't care about UNKNOWN.)
|
||||
* Otherwise, the result is FALSE.
|
||||
*
|
||||
* Note: the reason we can avoid a full scan of the main hash table
|
||||
* is that the combining operators are assumed never to yield NULL
|
||||
* when both inputs are non-null. If they were to do so, we might
|
||||
* need to produce UNKNOWN instead of FALSE because of an UNKNOWN
|
||||
* result in comparing the LHS to some main-table entry --- which
|
||||
* is a comparison we will not even make, unless there's a chance
|
||||
* match of hash keys.
|
||||
*/
|
||||
if (HeapTupleNoNulls(tup))
|
||||
{
|
||||
if (node->havehashrows &&
|
||||
LookupTupleHashEntry(node->hashtable, slot, NULL) != NULL)
|
||||
{
|
||||
ExecClearTuple(slot);
|
||||
return BoolGetDatum(true);
|
||||
}
|
||||
if (node->havenullrows &&
|
||||
findPartialMatch(node->hashnulls, slot))
|
||||
{
|
||||
ExecClearTuple(slot);
|
||||
*isNull = true;
|
||||
return BoolGetDatum(false);
|
||||
}
|
||||
ExecClearTuple(slot);
|
||||
return BoolGetDatum(false);
|
||||
}
|
||||
|
||||
/*
|
||||
* When the LHS is partly or wholly NULL, we can never return TRUE.
|
||||
* If we don't care about UNKNOWN, just return FALSE. Otherwise,
|
||||
* if the LHS is wholly NULL, immediately return UNKNOWN. (Since the
|
||||
* combining operators are strict, the result could only be FALSE if the
|
||||
* sub-select were empty, but we already handled that case.) Otherwise,
|
||||
* we must scan both the main and partly-null tables to see if there are
|
||||
* any rows that aren't provably unequal to the LHS; if so, the result is
|
||||
* UNKNOWN. Otherwise, the result is FALSE.
|
||||
*/
|
||||
if (node->hashnulls == NULL)
|
||||
{
|
||||
ExecClearTuple(slot);
|
||||
return BoolGetDatum(false);
|
||||
}
|
||||
if (tupleAllNulls(tup))
|
||||
{
|
||||
ExecClearTuple(slot);
|
||||
*isNull = true;
|
||||
return BoolGetDatum(false);
|
||||
}
|
||||
/* Scan partly-null table first, since more likely to get a match */
|
||||
if (node->havenullrows &&
|
||||
findPartialMatch(node->hashnulls, slot))
|
||||
{
|
||||
ExecClearTuple(slot);
|
||||
*isNull = true;
|
||||
return BoolGetDatum(false);
|
||||
}
|
||||
if (node->havehashrows &&
|
||||
findPartialMatch(node->hashtable, slot))
|
||||
{
|
||||
ExecClearTuple(slot);
|
||||
*isNull = true;
|
||||
return BoolGetDatum(false);
|
||||
}
|
||||
ExecClearTuple(slot);
|
||||
return BoolGetDatum(false);
|
||||
}
|
||||
|
||||
/*
|
||||
* ExecScanSubPlan: default case where we have to rescan subplan each time
|
||||
*/
|
||||
static Datum
|
||||
ExecScanSubPlan(SubPlanState *node,
|
||||
ExprContext *econtext,
|
||||
bool *isNull)
|
||||
{
|
||||
SubPlan *subplan = (SubPlan *) node->xprstate.expr;
|
||||
PlanState *planstate = node->planstate;
|
||||
SubLinkType subLinkType = subplan->subLinkType;
|
||||
bool useOr = subplan->useOr;
|
||||
@ -52,9 +214,6 @@ ExecSubPlan(SubPlanState *node,
|
||||
*/
|
||||
oldcontext = MemoryContextSwitchTo(node->sub_estate->es_query_cxt);
|
||||
|
||||
if (subplan->setParam != NIL)
|
||||
elog(ERROR, "ExecSubPlan: can't set parent params from subquery");
|
||||
|
||||
/*
|
||||
* Set Params of this plan from parent plan correlation Vars
|
||||
*/
|
||||
@ -267,6 +426,203 @@ ExecSubPlan(SubPlanState *node,
|
||||
return result;
|
||||
}
|
||||
|
||||
/*
|
||||
* buildSubPlanHash: load hash table by scanning subplan output.
|
||||
*/
|
||||
static void
|
||||
buildSubPlanHash(SubPlanState *node)
|
||||
{
|
||||
SubPlan *subplan = (SubPlan *) node->xprstate.expr;
|
||||
PlanState *planstate = node->planstate;
|
||||
int ncols = length(node->exprs);
|
||||
ExprContext *innerecontext = node->innerecontext;
|
||||
MemoryContext tempcxt = innerecontext->ecxt_per_tuple_memory;
|
||||
MemoryContext oldcontext;
|
||||
int nbuckets;
|
||||
TupleTableSlot *slot;
|
||||
|
||||
Assert(subplan->subLinkType == ANY_SUBLINK);
|
||||
Assert(!subplan->useOr);
|
||||
|
||||
/*
|
||||
* If we already had any hash tables, destroy 'em; then create
|
||||
* empty hash table(s).
|
||||
*
|
||||
* If we need to distinguish accurately between FALSE and UNKNOWN
|
||||
* (i.e., NULL) results of the IN operation, then we have to store
|
||||
* subplan output rows that are partly or wholly NULL. We store such
|
||||
* rows in a separate hash table that we expect will be much smaller
|
||||
* than the main table. (We can use hashing to eliminate partly-null
|
||||
* rows that are not distinct. We keep them separate to minimize the
|
||||
* cost of the inevitable full-table searches; see findPartialMatch.)
|
||||
*
|
||||
* If it's not necessary to distinguish FALSE and UNKNOWN, then we
|
||||
* don't need to store subplan output rows that contain NULL.
|
||||
*/
|
||||
MemoryContextReset(node->tablecxt);
|
||||
node->hashtable = NULL;
|
||||
node->hashnulls = NULL;
|
||||
node->havehashrows = false;
|
||||
node->havenullrows = false;
|
||||
|
||||
nbuckets = (int) ceil(planstate->plan->plan_rows);
|
||||
if (nbuckets < 1)
|
||||
nbuckets = 1;
|
||||
|
||||
node->hashtable = BuildTupleHashTable(ncols,
|
||||
node->keyColIdx,
|
||||
node->eqfunctions,
|
||||
nbuckets,
|
||||
sizeof(TupleHashEntryData),
|
||||
node->tablecxt,
|
||||
tempcxt);
|
||||
|
||||
if (!subplan->unknownEqFalse)
|
||||
{
|
||||
if (ncols == 1)
|
||||
nbuckets = 1; /* there can only be one entry */
|
||||
else
|
||||
{
|
||||
nbuckets /= 16;
|
||||
if (nbuckets < 1)
|
||||
nbuckets = 1;
|
||||
}
|
||||
node->hashnulls = BuildTupleHashTable(ncols,
|
||||
node->keyColIdx,
|
||||
node->eqfunctions,
|
||||
nbuckets,
|
||||
sizeof(TupleHashEntryData),
|
||||
node->tablecxt,
|
||||
tempcxt);
|
||||
}
|
||||
|
||||
/*
|
||||
* We are probably in a short-lived expression-evaluation context.
|
||||
* Switch to the child plan's per-query context for calling ExecProcNode.
|
||||
*/
|
||||
oldcontext = MemoryContextSwitchTo(node->sub_estate->es_query_cxt);
|
||||
|
||||
/*
|
||||
* Reset subplan to start.
|
||||
*/
|
||||
ExecReScan(planstate, NULL);
|
||||
|
||||
/*
|
||||
* Scan the subplan and load the hash table(s). Note that when there are
|
||||
* duplicate rows coming out of the sub-select, only one copy is stored.
|
||||
*/
|
||||
for (slot = ExecProcNode(planstate);
|
||||
!TupIsNull(slot);
|
||||
slot = ExecProcNode(planstate))
|
||||
{
|
||||
HeapTuple tup = slot->val;
|
||||
TupleDesc tdesc = slot->ttc_tupleDescriptor;
|
||||
int col = 1;
|
||||
List *plst;
|
||||
bool isnew;
|
||||
|
||||
/*
|
||||
* Load up the Params representing the raw sub-select outputs,
|
||||
* then form the projection tuple to store in the hashtable.
|
||||
*/
|
||||
foreach(plst, subplan->paramIds)
|
||||
{
|
||||
int paramid = lfirsti(plst);
|
||||
ParamExecData *prmdata;
|
||||
|
||||
prmdata = &(innerecontext->ecxt_param_exec_vals[paramid]);
|
||||
Assert(prmdata->execPlan == NULL);
|
||||
prmdata->value = heap_getattr(tup, col, tdesc,
|
||||
&(prmdata->isnull));
|
||||
col++;
|
||||
}
|
||||
slot = ExecProject(node->projRight, NULL);
|
||||
tup = slot->val;
|
||||
|
||||
/*
|
||||
* If result contains any nulls, store separately or not at all.
|
||||
* (Since we know the projection tuple has no junk columns, we
|
||||
* can just look at the overall hasnull info bit, instead of
|
||||
* groveling through the columns.)
|
||||
*/
|
||||
if (HeapTupleNoNulls(tup))
|
||||
{
|
||||
(void) LookupTupleHashEntry(node->hashtable, slot, &isnew);
|
||||
node->havehashrows = true;
|
||||
}
|
||||
else if (node->hashnulls)
|
||||
{
|
||||
(void) LookupTupleHashEntry(node->hashnulls, slot, &isnew);
|
||||
node->havenullrows = true;
|
||||
}
|
||||
|
||||
/*
|
||||
* Reset innerecontext after each inner tuple to free any memory
|
||||
* used in hash computation or comparison routines.
|
||||
*/
|
||||
ResetExprContext(innerecontext);
|
||||
}
|
||||
|
||||
/*
|
||||
* Since the projected tuples are in the sub-query's context and not
|
||||
* the main context, we'd better clear the tuple slot before there's
|
||||
* any chance of a reset of the sub-query's context. Else we will
|
||||
* have the potential for a double free attempt.
|
||||
*/
|
||||
ExecClearTuple(node->projRight->pi_slot);
|
||||
|
||||
MemoryContextSwitchTo(oldcontext);
|
||||
}
|
||||
|
||||
/*
|
||||
* findPartialMatch: does the hashtable contain an entry that is not
|
||||
* provably distinct from the tuple?
|
||||
*
|
||||
* We have to scan the whole hashtable; we can't usefully use hashkeys
|
||||
* to guide probing, since we might get partial matches on tuples with
|
||||
* hashkeys quite unrelated to what we'd get from the given tuple.
|
||||
*/
|
||||
static bool
|
||||
findPartialMatch(TupleHashTable hashtable, TupleTableSlot *slot)
|
||||
{
|
||||
int numCols = hashtable->numCols;
|
||||
AttrNumber *keyColIdx = hashtable->keyColIdx;
|
||||
HeapTuple tuple = slot->val;
|
||||
TupleDesc tupdesc = slot->ttc_tupleDescriptor;
|
||||
TupleHashIterator hashiter;
|
||||
TupleHashEntry entry;
|
||||
|
||||
ResetTupleHashIterator(&hashiter);
|
||||
while ((entry = ScanTupleHashTable(hashtable, &hashiter)) != NULL)
|
||||
{
|
||||
if (!execTuplesUnequal(entry->firstTuple,
|
||||
tuple,
|
||||
tupdesc,
|
||||
numCols, keyColIdx,
|
||||
hashtable->eqfunctions,
|
||||
hashtable->tempcxt))
|
||||
return true;
|
||||
}
|
||||
return false;
|
||||
}
|
||||
|
||||
/*
|
||||
* tupleAllNulls: is the tuple completely NULL?
|
||||
*/
|
||||
static bool
|
||||
tupleAllNulls(HeapTuple tuple)
|
||||
{
|
||||
int ncols = tuple->t_data->t_natts;
|
||||
int i;
|
||||
|
||||
for (i = 1; i <= ncols; i++)
|
||||
{
|
||||
if (!heap_attisnull(tuple, i))
|
||||
return false;
|
||||
}
|
||||
return true;
|
||||
}
|
||||
|
||||
/* ----------------------------------------------------------------
|
||||
* ExecInitSubPlan
|
||||
* ----------------------------------------------------------------
|
||||
@ -289,8 +645,14 @@ ExecInitSubPlan(SubPlanState *node, EState *estate)
|
||||
*/
|
||||
node->needShutdown = false;
|
||||
node->curTuple = NULL;
|
||||
node->projLeft = NULL;
|
||||
node->projRight = NULL;
|
||||
node->hashtable = NULL;
|
||||
node->hashnulls = NULL;
|
||||
node->tablecxt = NULL;
|
||||
node->innerecontext = NULL;
|
||||
node->keyColIdx = NULL;
|
||||
node->eqfunctions = NULL;
|
||||
|
||||
/*
|
||||
* create an EState for the subplan
|
||||
@ -343,6 +705,137 @@ ExecInitSubPlan(SubPlanState *node, EState *estate)
|
||||
* it, for others - it doesn't matter...
|
||||
*/
|
||||
}
|
||||
|
||||
/*
|
||||
* If we are going to hash the subquery output, initialize relevant
|
||||
* stuff. (We don't create the hashtable until needed, though.)
|
||||
*/
|
||||
if (subplan->useHashTable)
|
||||
{
|
||||
int ncols,
|
||||
i;
|
||||
TupleDesc tupDesc;
|
||||
TupleTable tupTable;
|
||||
TupleTableSlot *slot;
|
||||
List *lefttlist,
|
||||
*righttlist,
|
||||
*leftptlist,
|
||||
*rightptlist,
|
||||
*lexpr;
|
||||
|
||||
/* We need a memory context to hold the hash table(s) */
|
||||
node->tablecxt =
|
||||
AllocSetContextCreate(CurrentMemoryContext,
|
||||
"Subplan HashTable Context",
|
||||
ALLOCSET_DEFAULT_MINSIZE,
|
||||
ALLOCSET_DEFAULT_INITSIZE,
|
||||
ALLOCSET_DEFAULT_MAXSIZE);
|
||||
/* and a short-lived exprcontext for function evaluation */
|
||||
node->innerecontext = CreateExprContext(estate);
|
||||
/* Silly little array of column numbers 1..n */
|
||||
ncols = length(node->exprs);
|
||||
node->keyColIdx = (AttrNumber *) palloc(ncols * sizeof(AttrNumber));
|
||||
for (i = 0; i < ncols; i++)
|
||||
node->keyColIdx[i] = i+1;
|
||||
/*
|
||||
* We use ExecProject to evaluate the lefthand and righthand
|
||||
* expression lists and form tuples. (You might think that we
|
||||
* could use the sub-select's output tuples directly, but that is
|
||||
* not the case if we had to insert any run-time coercions of the
|
||||
* sub-select's output datatypes; anyway this avoids storing any
|
||||
* resjunk columns that might be in the sub-select's output.)
|
||||
* Run through the combining expressions to build tlists for the
|
||||
* lefthand and righthand sides. We need both the ExprState list
|
||||
* (for ExecProject) and the underlying parse Exprs (for
|
||||
* ExecTypeFromTL).
|
||||
*
|
||||
* We also extract the combining operators themselves to initialize
|
||||
* the equality functions for the hash tables.
|
||||
*/
|
||||
lefttlist = righttlist = NIL;
|
||||
leftptlist = rightptlist = NIL;
|
||||
node->eqfunctions = (FmgrInfo *) palloc(ncols * sizeof(FmgrInfo));
|
||||
i = 1;
|
||||
foreach(lexpr, node->exprs)
|
||||
{
|
||||
FuncExprState *fstate = (FuncExprState *) lfirst(lexpr);
|
||||
OpExpr *opexpr = (OpExpr *) fstate->xprstate.expr;
|
||||
ExprState *exstate;
|
||||
Expr *expr;
|
||||
TargetEntry *tle;
|
||||
GenericExprState *tlestate;
|
||||
|
||||
Assert(IsA(fstate, FuncExprState));
|
||||
Assert(IsA(opexpr, OpExpr));
|
||||
Assert(length(fstate->args) == 2);
|
||||
|
||||
/* Process lefthand argument */
|
||||
exstate = (ExprState *) lfirst(fstate->args);
|
||||
expr = exstate->expr;
|
||||
tle = makeTargetEntry(makeResdom(i,
|
||||
exprType((Node *) expr),
|
||||
exprTypmod((Node *) expr),
|
||||
NULL,
|
||||
false),
|
||||
expr);
|
||||
tlestate = makeNode(GenericExprState);
|
||||
tlestate->xprstate.expr = (Expr *) tle;
|
||||
tlestate->arg = exstate;
|
||||
lefttlist = lappend(lefttlist, tlestate);
|
||||
leftptlist = lappend(leftptlist, tle);
|
||||
|
||||
/* Process righthand argument */
|
||||
exstate = (ExprState *) lsecond(fstate->args);
|
||||
expr = exstate->expr;
|
||||
tle = makeTargetEntry(makeResdom(i,
|
||||
exprType((Node *) expr),
|
||||
exprTypmod((Node *) expr),
|
||||
NULL,
|
||||
false),
|
||||
expr);
|
||||
tlestate = makeNode(GenericExprState);
|
||||
tlestate->xprstate.expr = (Expr *) tle;
|
||||
tlestate->arg = exstate;
|
||||
righttlist = lappend(righttlist, tlestate);
|
||||
rightptlist = lappend(rightptlist, tle);
|
||||
|
||||
/* Lookup the combining function */
|
||||
fmgr_info(opexpr->opfuncid, &node->eqfunctions[i-1]);
|
||||
|
||||
i++;
|
||||
}
|
||||
|
||||
/*
|
||||
* Create a tupletable to hold these tuples. (Note: we never bother
|
||||
* to free the tupletable explicitly; that's okay because it will
|
||||
* never store raw disk tuples that might have associated buffer
|
||||
* pins. The only resource involved is memory, which will be
|
||||
* cleaned up by freeing the query context.)
|
||||
*/
|
||||
tupTable = ExecCreateTupleTable(2);
|
||||
|
||||
/*
|
||||
* Construct tupdescs, slots and projection nodes for left and
|
||||
* right sides. The lefthand expressions will be evaluated in
|
||||
* the parent plan node's exprcontext, which we don't have access
|
||||
* to here. Fortunately we can just pass NULL for now and fill it
|
||||
* in later (hack alert!). The righthand expressions will be
|
||||
* evaluated in our own innerecontext.
|
||||
*/
|
||||
tupDesc = ExecTypeFromTL(leftptlist, false);
|
||||
slot = ExecAllocTableSlot(tupTable);
|
||||
ExecSetSlotDescriptor(slot, tupDesc, true);
|
||||
node->projLeft = ExecBuildProjectionInfo(lefttlist,
|
||||
NULL,
|
||||
slot);
|
||||
|
||||
tupDesc = ExecTypeFromTL(rightptlist, false);
|
||||
slot = ExecAllocTableSlot(tupTable);
|
||||
ExecSetSlotDescriptor(slot, tupDesc, true);
|
||||
node->projRight = ExecBuildProjectionInfo(righttlist,
|
||||
node->innerecontext,
|
||||
slot);
|
||||
}
|
||||
}
|
||||
|
||||
/* ----------------------------------------------------------------
|
||||
@ -476,11 +969,6 @@ ExecEndSubPlan(SubPlanState *node)
|
||||
node->planstate = NULL;
|
||||
node->needShutdown = false;
|
||||
}
|
||||
if (node->curTuple)
|
||||
{
|
||||
heap_freetuple(node->curTuple);
|
||||
node->curTuple = NULL;
|
||||
}
|
||||
}
|
||||
|
||||
void
|
||||
|
||||
@ -7,7 +7,7 @@
|
||||
* Portions Copyright (c) 1994, Regents of the University of California
|
||||
*
|
||||
* IDENTIFICATION
|
||||
* $Header: /cvsroot/pgsql/src/backend/optimizer/plan/subselect.c,v 1.63 2003/01/10 21:08:11 tgl Exp $
|
||||
* $Header: /cvsroot/pgsql/src/backend/optimizer/plan/subselect.c,v 1.64 2003/01/12 04:03:34 tgl Exp $
|
||||
*
|
||||
*-------------------------------------------------------------------------
|
||||
*/
|
||||
@ -197,9 +197,9 @@ make_subplan(SubLink *slink, List *lefthand)
|
||||
* NOTE: if you change these numbers, also change cost_qual_eval_walker()
|
||||
* in path/costsize.c.
|
||||
*
|
||||
* XXX If an ALL/ANY subplan is uncorrelated, we may decide to
|
||||
* materialize its result below. In that case it would've been better
|
||||
* to specify full retrieval. At present, however, we can only detect
|
||||
* XXX If an ALL/ANY subplan is uncorrelated, we may decide to hash or
|
||||
* materialize its result below. In that case it would've been better to
|
||||
* specify full retrieval. At present, however, we can only detect
|
||||
* correlation or lack of it after we've made the subplan :-(. Perhaps
|
||||
* detection of correlation should be done as a separate step.
|
||||
* Meanwhile, we don't want to be too optimistic about the percentage
|
||||
@ -525,10 +525,17 @@ subplan_is_hashable(SubLink *slink, SubPlan *node)
|
||||
if (subquery_size > SortMem * 1024L)
|
||||
return false;
|
||||
/*
|
||||
* The combining operators must be hashable and strict. (Without
|
||||
* strictness, behavior in the presence of nulls is too unpredictable.
|
||||
* We actually must assume even more than plain strictness, see
|
||||
* nodeSubplan.c for details.)
|
||||
* The combining operators must be hashable, strict, and self-commutative.
|
||||
* The need for hashability is obvious, since we want to use hashing.
|
||||
* Without strictness, behavior in the presence of nulls is too
|
||||
* unpredictable. (We actually must assume even more than plain
|
||||
* strictness, see nodeSubplan.c for details.) And commutativity ensures
|
||||
* that the left and right datatypes are the same; this allows us to
|
||||
* assume that the combining operators are equality for the righthand
|
||||
* datatype, so that they can be used to compare righthand tuples as
|
||||
* well as comparing lefthand to righthand tuples. (This last restriction
|
||||
* could be relaxed by using two different sets of operators with the
|
||||
* hash table, but there is no obvious usefulness to that at present.)
|
||||
*/
|
||||
foreach(opids, slink->operOids)
|
||||
{
|
||||
@ -542,7 +549,8 @@ subplan_is_hashable(SubLink *slink, SubPlan *node)
|
||||
if (!HeapTupleIsValid(tup))
|
||||
elog(ERROR, "cache lookup failed for operator %u", opid);
|
||||
optup = (Form_pg_operator) GETSTRUCT(tup);
|
||||
if (!optup->oprcanhash || !func_strict(optup->oprcode))
|
||||
if (!optup->oprcanhash || optup->oprcom != opid ||
|
||||
!func_strict(optup->oprcode))
|
||||
{
|
||||
ReleaseSysCache(tup);
|
||||
return false;
|
||||
|
||||
@ -7,7 +7,7 @@
|
||||
* Portions Copyright (c) 1996-2002, PostgreSQL Global Development Group
|
||||
* Portions Copyright (c) 1994, Regents of the University of California
|
||||
*
|
||||
* $Id: executor.h,v 1.86 2003/01/10 23:54:24 tgl Exp $
|
||||
* $Id: executor.h,v 1.87 2003/01/12 04:03:34 tgl Exp $
|
||||
*
|
||||
*-------------------------------------------------------------------------
|
||||
*/
|
||||
@ -46,6 +46,13 @@ extern bool execTuplesMatch(HeapTuple tuple1,
|
||||
AttrNumber *matchColIdx,
|
||||
FmgrInfo *eqfunctions,
|
||||
MemoryContext evalContext);
|
||||
extern bool execTuplesUnequal(HeapTuple tuple1,
|
||||
HeapTuple tuple2,
|
||||
TupleDesc tupdesc,
|
||||
int numCols,
|
||||
AttrNumber *matchColIdx,
|
||||
FmgrInfo *eqfunctions,
|
||||
MemoryContext evalContext);
|
||||
extern FmgrInfo *execTuplesMatchPrepare(TupleDesc tupdesc,
|
||||
int numCols,
|
||||
AttrNumber *matchColIdx);
|
||||
@ -214,6 +221,9 @@ extern void ExecAssignResultType(PlanState *planstate,
|
||||
extern void ExecAssignResultTypeFromOuterPlan(PlanState *planstate);
|
||||
extern void ExecAssignResultTypeFromTL(PlanState *planstate);
|
||||
extern TupleDesc ExecGetResultType(PlanState *planstate);
|
||||
extern ProjectionInfo *ExecBuildProjectionInfo(List *targetList,
|
||||
ExprContext *econtext,
|
||||
TupleTableSlot *slot);
|
||||
extern void ExecAssignProjectionInfo(PlanState *planstate);
|
||||
extern void ExecFreeExprContext(PlanState *planstate);
|
||||
extern TupleDesc ExecGetScanType(ScanState *scanstate);
|
||||
|
||||
@ -7,7 +7,7 @@
|
||||
* Portions Copyright (c) 1996-2002, PostgreSQL Global Development Group
|
||||
* Portions Copyright (c) 1994, Regents of the University of California
|
||||
*
|
||||
* $Id: execnodes.h,v 1.90 2003/01/10 23:54:24 tgl Exp $
|
||||
* $Id: execnodes.h,v 1.91 2003/01/12 04:03:34 tgl Exp $
|
||||
*
|
||||
*-------------------------------------------------------------------------
|
||||
*/
|
||||
@ -170,27 +170,34 @@ typedef struct ReturnSetInfo
|
||||
/* ----------------
|
||||
* ProjectionInfo node information
|
||||
*
|
||||
* This is all the information needed to perform projections
|
||||
* on a tuple. Nodes which need to do projections create one
|
||||
* of these. In theory, when a node wants to perform a projection
|
||||
* This is all the information needed to perform projections ---
|
||||
* that is, form new tuples by evaluation of targetlist expressions.
|
||||
* Nodes which need to do projections create one of these.
|
||||
* In theory, when a node wants to perform a projection
|
||||
* it should just update this information as necessary and then
|
||||
* call ExecProject(). -cim 6/3/91
|
||||
*
|
||||
* ExecProject() evaluates the tlist, forms a tuple, and stores it
|
||||
* in the given slot. As a side-effect, the actual datum values and
|
||||
* null indicators are placed in the work arrays tupValues/tupNulls.
|
||||
*
|
||||
* targetlist target list for projection
|
||||
* len length of target list
|
||||
* tupValue array of pointers to projection results
|
||||
* exprContext expression context for ExecTargetList
|
||||
* exprContext expression context in which to evaluate targetlist
|
||||
* slot slot to place projection result in
|
||||
* tupValues array of computed values
|
||||
* tupNull array of null indicators
|
||||
* itemIsDone workspace for ExecProject
|
||||
* ----------------
|
||||
*/
|
||||
typedef struct ProjectionInfo
|
||||
{
|
||||
NodeTag type;
|
||||
List *pi_targetlist;
|
||||
int pi_len;
|
||||
Datum *pi_tupValue;
|
||||
ExprContext *pi_exprContext;
|
||||
TupleTableSlot *pi_slot;
|
||||
Datum *pi_tupValues;
|
||||
char *pi_tupNulls;
|
||||
ExprDoneCond *pi_itemIsDone;
|
||||
} ProjectionInfo;
|
||||
|
||||
/* ----------------
|
||||
@ -495,8 +502,16 @@ typedef struct SubPlanState
|
||||
bool needShutdown; /* TRUE = need to shutdown subplan */
|
||||
HeapTuple curTuple; /* copy of most recent tuple from subplan */
|
||||
/* these are used when hashing the subselect's output: */
|
||||
ProjectionInfo *projLeft; /* for projecting lefthand exprs */
|
||||
ProjectionInfo *projRight; /* for projecting subselect output */
|
||||
TupleHashTable hashtable; /* hash table for no-nulls subselect rows */
|
||||
TupleHashTable hashnulls; /* hash table for rows with null(s) */
|
||||
bool havehashrows; /* TRUE if hashtable is not empty */
|
||||
bool havenullrows; /* TRUE if hashnulls is not empty */
|
||||
MemoryContext tablecxt; /* memory context containing tables */
|
||||
ExprContext *innerecontext; /* working context for comparisons */
|
||||
AttrNumber *keyColIdx; /* control data for hash tables */
|
||||
FmgrInfo *eqfunctions; /* comparison functions for hash tables */
|
||||
} SubPlanState;
|
||||
|
||||
/* ----------------
|
||||
|
||||
Loading…
x
Reference in New Issue
Block a user