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Refactor ATExecAddColumn() to use BuildDescForRelation()

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BuildDescForRelation() has all the knowledge for converting a
ColumnDef into pg_attribute/tuple descriptor.  ATExecAddColumn() can
make use of that, instead of duplicating all that logic.  We just pass
a one-element list of ColumnDef and we get back exactly the data
structure we need.  Note that we don't even need to touch
BuildDescForRelation() to make this work.

Reviewed-by: Alvaro Herrera <alvherre@alvh.no-ip.org>
Discussion: https://www.postgresql.org/message-id/flat/52a125e4-ff9a-95f5-9f61-b87cf447e4da@eisentraut.org
This commit is contained in:
Peter Eisentraut 2024-01-12 16:05:15 +01:00
parent 882887e9b4
commit a1604237a6
1 changed files with 22 additions and 67 deletions
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89
src/backend/commands/tablecmds.c
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@ -6984,22 +6984,15 @@ ATExecAddColumn(List **wqueue, AlteredTableInfo *tab, Relation rel,
Relation pgclass,
attrdesc;
HeapTuple reltup;
FormData_pg_attribute attribute;
Form_pg_attribute attribute;
int newattnum;
char relkind;
HeapTuple typeTuple;
Oid typeOid;
int32 typmod;
Oid collOid;
Form_pg_type tform;
Expr *defval;
List *children;
ListCell *child;
AlterTableCmd *childcmd;
AclResult aclresult;
ObjectAddress address;
TupleDesc tupdesc;
FormData_pg_attribute *aattr[] = {&attribute};
/* At top level, permission check was done in ATPrepCmd, else do it */
if (recursing)
@ -7121,59 +7114,21 @@ ATExecAddColumn(List **wqueue, AlteredTableInfo *tab, Relation rel,
errmsg("tables can have at most %d columns",
MaxHeapAttributeNumber)));
typeTuple = typenameType(NULL, colDef->typeName, &typmod);
tform = (Form_pg_type) GETSTRUCT(typeTuple);
typeOid = tform->oid;
/*
* Construct new attribute's pg_attribute entry.
*/
tupdesc = BuildDescForRelation(list_make1(colDef));
aclresult = object_aclcheck(TypeRelationId, typeOid, GetUserId(), ACL_USAGE);
if (aclresult != ACLCHECK_OK)
aclcheck_error_type(aclresult, typeOid);
attribute = TupleDescAttr(tupdesc, 0);
collOid = GetColumnDefCollation(NULL, colDef, typeOid);
/* Fix up attribute number */
attribute->attnum = newattnum;
/* make sure datatype is legal for a column */
CheckAttributeType(colDef->colname, typeOid, collOid,
CheckAttributeType(NameStr(attribute->attname), attribute->atttypid, attribute->attcollation,
list_make1_oid(rel->rd_rel->reltype),
0);
/*
* Construct new attribute's pg_attribute entry. (Variable-length fields
* are handled by InsertPgAttributeTuples().)
*/
attribute.attrelid = myrelid;
namestrcpy(&(attribute.attname), colDef->colname);
attribute.atttypid = typeOid;
attribute.attstattarget = -1;
attribute.attlen = tform->typlen;
attribute.attnum = newattnum;
if (list_length(colDef->typeName->arrayBounds) > PG_INT16_MAX)
ereport(ERROR,
errcode(ERRCODE_PROGRAM_LIMIT_EXCEEDED),
errmsg("too many array dimensions"));
attribute.attndims = list_length(colDef->typeName->arrayBounds);
attribute.atttypmod = typmod;
attribute.attbyval = tform->typbyval;
attribute.attalign = tform->typalign;
if (colDef->storage_name)
attribute.attstorage = GetAttributeStorage(typeOid, colDef->storage_name);
else
attribute.attstorage = tform->typstorage;
attribute.attcompression = GetAttributeCompression(typeOid,
colDef->compression);
attribute.attnotnull = colDef->is_not_null;
attribute.atthasdef = false;
attribute.atthasmissing = false;
attribute.attidentity = colDef->identity;
attribute.attgenerated = colDef->generated;
attribute.attisdropped = false;
attribute.attislocal = colDef->is_local;
attribute.attinhcount = colDef->inhcount;
attribute.attcollation = collOid;
ReleaseSysCache(typeTuple);
tupdesc = CreateTupleDesc(lengthof(aattr), (FormData_pg_attribute **) &aattr);
InsertPgAttributeTuples(attrdesc, tupdesc, myrelid, NULL, NULL);
table_close(attrdesc, RowExclusiveLock);
@ -7203,7 +7158,7 @@ ATExecAddColumn(List **wqueue, AlteredTableInfo *tab, Relation rel,
RawColumnDefault *rawEnt;
rawEnt = (RawColumnDefault *) palloc(sizeof(RawColumnDefault));
rawEnt->attnum = attribute.attnum;
rawEnt->attnum = attribute->attnum;
rawEnt->raw_default = copyObject(colDef->raw_default);
/*
@ -7277,7 +7232,7 @@ ATExecAddColumn(List **wqueue, AlteredTableInfo *tab, Relation rel,
NextValueExpr *nve = makeNode(NextValueExpr);
nve->seqid = RangeVarGetRelid(colDef->identitySequence, NoLock, false);
nve->typeId = typeOid;
nve->typeId = attribute->atttypid;
defval = (Expr *) nve;
@ -7285,23 +7240,23 @@ ATExecAddColumn(List **wqueue, AlteredTableInfo *tab, Relation rel,
tab->rewrite |= AT_REWRITE_DEFAULT_VAL;
}
else
defval = (Expr *) build_column_default(rel, attribute.attnum);
defval = (Expr *) build_column_default(rel, attribute->attnum);
if (!defval && DomainHasConstraints(typeOid))
if (!defval && DomainHasConstraints(attribute->atttypid))
{
Oid baseTypeId;
int32 baseTypeMod;
Oid baseTypeColl;
baseTypeMod = typmod;
baseTypeId = getBaseTypeAndTypmod(typeOid, &baseTypeMod);
baseTypeMod = attribute->atttypmod;
baseTypeId = getBaseTypeAndTypmod(attribute->atttypid, &baseTypeMod);
baseTypeColl = get_typcollation(baseTypeId);
defval = (Expr *) makeNullConst(baseTypeId, baseTypeMod, baseTypeColl);
defval = (Expr *) coerce_to_target_type(NULL,
(Node *) defval,
baseTypeId,
typeOid,
typmod,
attribute->atttypid,
attribute->atttypmod,
COERCION_ASSIGNMENT,
COERCE_IMPLICIT_CAST,
-1);
@ -7314,17 +7269,17 @@ ATExecAddColumn(List **wqueue, AlteredTableInfo *tab, Relation rel,
NewColumnValue *newval;
newval = (NewColumnValue *) palloc0(sizeof(NewColumnValue));
newval->attnum = attribute.attnum;
newval->attnum = attribute->attnum;
newval->expr = expression_planner(defval);
newval->is_generated = (colDef->generated != '\0');
tab->newvals = lappend(tab->newvals, newval);
}
if (DomainHasConstraints(typeOid))
if (DomainHasConstraints(attribute->atttypid))
tab->rewrite |= AT_REWRITE_DEFAULT_VAL;
if (!TupleDescAttr(rel->rd_att, attribute.attnum - 1)->atthasmissing)
if (!TupleDescAttr(rel->rd_att, attribute->attnum - 1)->atthasmissing)
{
/*
* If the new column is NOT NULL, and there is no missing value,
@ -7337,8 +7292,8 @@ ATExecAddColumn(List **wqueue, AlteredTableInfo *tab, Relation rel,
/*
* Add needed dependency entries for the new column.
*/
add_column_datatype_dependency(myrelid, newattnum, attribute.atttypid);
add_column_collation_dependency(myrelid, newattnum, attribute.attcollation);
add_column_datatype_dependency(myrelid, newattnum, attribute->atttypid);
add_column_collation_dependency(myrelid, newattnum, attribute->attcollation);
/*
* Propagate to children as appropriate. Unlike most other ALTER