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c219d9b0a5
This reduces unnecessary exposure of other headers through htup.h, which is very widely included by many files. I have chosen to move the function prototypes to the new file as well, because that means htup.h no longer needs to include tupdesc.h. In itself this doesn't have much effect in indirect inclusion of tupdesc.h throughout the tree, because it's also required by execnodes.h; but it's something to explore in the future, and it seemed best to do the htup.h change now while I'm busy with it.
668 lines
13 KiB
C
668 lines
13 KiB
C
/*
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* op function for ltree
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* Teodor Sigaev <teodor@stack.net>
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* contrib/ltree/ltree_op.c
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*/
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#include "postgres.h"
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#include <ctype.h>
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#include "access/htup_details.h"
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#include "catalog/pg_statistic.h"
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#include "utils/builtins.h"
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#include "utils/lsyscache.h"
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#include "utils/selfuncs.h"
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#include "ltree.h"
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PG_MODULE_MAGIC;
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/* compare functions */
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PG_FUNCTION_INFO_V1(ltree_cmp);
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PG_FUNCTION_INFO_V1(ltree_lt);
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PG_FUNCTION_INFO_V1(ltree_le);
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PG_FUNCTION_INFO_V1(ltree_eq);
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PG_FUNCTION_INFO_V1(ltree_ne);
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PG_FUNCTION_INFO_V1(ltree_ge);
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PG_FUNCTION_INFO_V1(ltree_gt);
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PG_FUNCTION_INFO_V1(nlevel);
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PG_FUNCTION_INFO_V1(ltree_isparent);
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PG_FUNCTION_INFO_V1(ltree_risparent);
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PG_FUNCTION_INFO_V1(subltree);
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PG_FUNCTION_INFO_V1(subpath);
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PG_FUNCTION_INFO_V1(ltree_index);
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PG_FUNCTION_INFO_V1(ltree_addltree);
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PG_FUNCTION_INFO_V1(ltree_addtext);
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PG_FUNCTION_INFO_V1(ltree_textadd);
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PG_FUNCTION_INFO_V1(lca);
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PG_FUNCTION_INFO_V1(ltree2text);
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PG_FUNCTION_INFO_V1(text2ltree);
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PG_FUNCTION_INFO_V1(ltreeparentsel);
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Datum ltree_cmp(PG_FUNCTION_ARGS);
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Datum ltree_lt(PG_FUNCTION_ARGS);
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Datum ltree_le(PG_FUNCTION_ARGS);
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Datum ltree_eq(PG_FUNCTION_ARGS);
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Datum ltree_ne(PG_FUNCTION_ARGS);
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Datum ltree_ge(PG_FUNCTION_ARGS);
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Datum ltree_gt(PG_FUNCTION_ARGS);
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Datum nlevel(PG_FUNCTION_ARGS);
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Datum subltree(PG_FUNCTION_ARGS);
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Datum subpath(PG_FUNCTION_ARGS);
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Datum ltree_index(PG_FUNCTION_ARGS);
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Datum ltree_addltree(PG_FUNCTION_ARGS);
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Datum ltree_addtext(PG_FUNCTION_ARGS);
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Datum ltree_textadd(PG_FUNCTION_ARGS);
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Datum lca(PG_FUNCTION_ARGS);
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Datum ltree2text(PG_FUNCTION_ARGS);
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Datum text2ltree(PG_FUNCTION_ARGS);
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Datum ltreeparentsel(PG_FUNCTION_ARGS);
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int
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ltree_compare(const ltree *a, const ltree *b)
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{
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ltree_level *al = LTREE_FIRST(a);
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ltree_level *bl = LTREE_FIRST(b);
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int an = a->numlevel;
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int bn = b->numlevel;
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int res = 0;
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while (an > 0 && bn > 0)
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{
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if ((res = memcmp(al->name, bl->name, Min(al->len, bl->len))) == 0)
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{
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if (al->len != bl->len)
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return (al->len - bl->len) * 10 * (an + 1);
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}
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else
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return res * 10 * (an + 1);
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an--;
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bn--;
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al = LEVEL_NEXT(al);
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bl = LEVEL_NEXT(bl);
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}
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return (a->numlevel - b->numlevel) * 10 * (an + 1);
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}
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#define RUNCMP \
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ltree *a = PG_GETARG_LTREE(0); \
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ltree *b = PG_GETARG_LTREE(1); \
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int res = ltree_compare(a,b); \
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PG_FREE_IF_COPY(a,0); \
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PG_FREE_IF_COPY(b,1); \
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Datum
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ltree_cmp(PG_FUNCTION_ARGS)
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{
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RUNCMP
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PG_RETURN_INT32(res);
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}
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Datum
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ltree_lt(PG_FUNCTION_ARGS)
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{
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RUNCMP
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PG_RETURN_BOOL((res < 0) ? true : false);
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}
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Datum
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ltree_le(PG_FUNCTION_ARGS)
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{
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RUNCMP
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PG_RETURN_BOOL((res <= 0) ? true : false);
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}
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Datum
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ltree_eq(PG_FUNCTION_ARGS)
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{
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RUNCMP
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PG_RETURN_BOOL((res == 0) ? true : false);
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}
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Datum
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ltree_ge(PG_FUNCTION_ARGS)
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{
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RUNCMP
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PG_RETURN_BOOL((res >= 0) ? true : false);
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}
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Datum
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ltree_gt(PG_FUNCTION_ARGS)
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{
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RUNCMP
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PG_RETURN_BOOL((res > 0) ? true : false);
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}
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Datum
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ltree_ne(PG_FUNCTION_ARGS)
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{
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RUNCMP
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PG_RETURN_BOOL((res != 0) ? true : false);
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}
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Datum
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nlevel(PG_FUNCTION_ARGS)
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{
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ltree *a = PG_GETARG_LTREE(0);
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int res = a->numlevel;
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PG_FREE_IF_COPY(a, 0);
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PG_RETURN_INT32(res);
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}
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bool
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inner_isparent(const ltree *c, const ltree *p)
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{
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ltree_level *cl = LTREE_FIRST(c);
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ltree_level *pl = LTREE_FIRST(p);
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int pn = p->numlevel;
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if (pn > c->numlevel)
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return false;
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while (pn > 0)
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{
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if (cl->len != pl->len)
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return false;
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if (memcmp(cl->name, pl->name, cl->len))
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return false;
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pn--;
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cl = LEVEL_NEXT(cl);
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pl = LEVEL_NEXT(pl);
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}
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return true;
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}
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Datum
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ltree_isparent(PG_FUNCTION_ARGS)
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{
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ltree *c = PG_GETARG_LTREE(1);
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ltree *p = PG_GETARG_LTREE(0);
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bool res = inner_isparent(c, p);
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PG_FREE_IF_COPY(c, 1);
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PG_FREE_IF_COPY(p, 0);
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PG_RETURN_BOOL(res);
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}
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Datum
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ltree_risparent(PG_FUNCTION_ARGS)
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{
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ltree *c = PG_GETARG_LTREE(0);
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ltree *p = PG_GETARG_LTREE(1);
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bool res = inner_isparent(c, p);
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PG_FREE_IF_COPY(c, 0);
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PG_FREE_IF_COPY(p, 1);
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PG_RETURN_BOOL(res);
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}
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static ltree *
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inner_subltree(ltree *t, int32 startpos, int32 endpos)
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{
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char *start = NULL,
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*end = NULL;
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ltree_level *ptr = LTREE_FIRST(t);
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ltree *res;
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int i;
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if (startpos < 0 || endpos < 0 || startpos >= t->numlevel || startpos > endpos)
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ereport(ERROR,
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(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
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errmsg("invalid positions")));
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if (endpos > t->numlevel)
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endpos = t->numlevel;
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start = end = (char *) ptr;
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for (i = 0; i < endpos; i++)
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{
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if (i == startpos)
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start = (char *) ptr;
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if (i == endpos - 1)
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{
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end = (char *) LEVEL_NEXT(ptr);
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break;
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}
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ptr = LEVEL_NEXT(ptr);
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}
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res = (ltree *) palloc(LTREE_HDRSIZE + (end - start));
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SET_VARSIZE(res, LTREE_HDRSIZE + (end - start));
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res->numlevel = endpos - startpos;
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memcpy(LTREE_FIRST(res), start, end - start);
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return res;
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}
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Datum
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subltree(PG_FUNCTION_ARGS)
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{
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ltree *t = PG_GETARG_LTREE(0);
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ltree *res = inner_subltree(t, PG_GETARG_INT32(1), PG_GETARG_INT32(2));
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PG_FREE_IF_COPY(t, 0);
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PG_RETURN_POINTER(res);
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}
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Datum
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subpath(PG_FUNCTION_ARGS)
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{
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ltree *t = PG_GETARG_LTREE(0);
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int32 start = PG_GETARG_INT32(1);
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int32 len = (fcinfo->nargs == 3) ? PG_GETARG_INT32(2) : 0;
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int32 end;
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ltree *res;
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end = start + len;
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if (start < 0)
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{
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start = t->numlevel + start;
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end = start + len;
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}
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if (start < 0)
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{ /* start > t->numlevel */
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start = t->numlevel + start;
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end = start + len;
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}
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if (len < 0)
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end = t->numlevel + len;
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else if (len == 0)
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end = (fcinfo->nargs == 3) ? start : 0xffff;
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res = inner_subltree(t, start, end);
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PG_FREE_IF_COPY(t, 0);
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PG_RETURN_POINTER(res);
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}
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static ltree *
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ltree_concat(ltree *a, ltree *b)
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{
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ltree *r;
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r = (ltree *) palloc(VARSIZE(a) + VARSIZE(b) - LTREE_HDRSIZE);
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SET_VARSIZE(r, VARSIZE(a) + VARSIZE(b) - LTREE_HDRSIZE);
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r->numlevel = a->numlevel + b->numlevel;
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memcpy(LTREE_FIRST(r), LTREE_FIRST(a), VARSIZE(a) - LTREE_HDRSIZE);
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memcpy(((char *) LTREE_FIRST(r)) + VARSIZE(a) - LTREE_HDRSIZE,
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LTREE_FIRST(b),
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VARSIZE(b) - LTREE_HDRSIZE);
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return r;
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}
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Datum
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ltree_addltree(PG_FUNCTION_ARGS)
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{
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ltree *a = PG_GETARG_LTREE(0);
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ltree *b = PG_GETARG_LTREE(1);
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ltree *r;
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r = ltree_concat(a, b);
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PG_FREE_IF_COPY(a, 0);
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PG_FREE_IF_COPY(b, 1);
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PG_RETURN_POINTER(r);
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}
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Datum
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ltree_addtext(PG_FUNCTION_ARGS)
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{
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ltree *a = PG_GETARG_LTREE(0);
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text *b = PG_GETARG_TEXT_PP(1);
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char *s;
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ltree *r,
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*tmp;
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s = text_to_cstring(b);
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tmp = (ltree *) DatumGetPointer(DirectFunctionCall1(ltree_in,
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PointerGetDatum(s)));
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pfree(s);
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r = ltree_concat(a, tmp);
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pfree(tmp);
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PG_FREE_IF_COPY(a, 0);
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PG_FREE_IF_COPY(b, 1);
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PG_RETURN_POINTER(r);
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}
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Datum
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ltree_index(PG_FUNCTION_ARGS)
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{
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ltree *a = PG_GETARG_LTREE(0);
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ltree *b = PG_GETARG_LTREE(1);
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int start = (fcinfo->nargs == 3) ? PG_GETARG_INT32(2) : 0;
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int i,
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j;
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ltree_level *startptr,
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*aptr,
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*bptr;
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bool found = false;
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if (start < 0)
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{
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if (-start >= a->numlevel)
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start = 0;
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else
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start = (int) (a->numlevel) + start;
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}
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if (a->numlevel - start < b->numlevel || a->numlevel == 0 || b->numlevel == 0)
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{
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PG_FREE_IF_COPY(a, 0);
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PG_FREE_IF_COPY(b, 1);
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PG_RETURN_INT32(-1);
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}
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startptr = LTREE_FIRST(a);
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for (i = 0; i <= a->numlevel - b->numlevel; i++)
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{
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if (i >= start)
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{
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aptr = startptr;
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bptr = LTREE_FIRST(b);
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for (j = 0; j < b->numlevel; j++)
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{
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if (!(aptr->len == bptr->len && memcmp(aptr->name, bptr->name, aptr->len) == 0))
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break;
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aptr = LEVEL_NEXT(aptr);
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bptr = LEVEL_NEXT(bptr);
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}
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if (j == b->numlevel)
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{
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found = true;
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break;
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}
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}
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startptr = LEVEL_NEXT(startptr);
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}
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if (!found)
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i = -1;
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PG_FREE_IF_COPY(a, 0);
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PG_FREE_IF_COPY(b, 1);
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PG_RETURN_INT32(i);
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}
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Datum
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ltree_textadd(PG_FUNCTION_ARGS)
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{
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ltree *a = PG_GETARG_LTREE(1);
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text *b = PG_GETARG_TEXT_PP(0);
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char *s;
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ltree *r,
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*tmp;
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s = text_to_cstring(b);
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tmp = (ltree *) DatumGetPointer(DirectFunctionCall1(ltree_in,
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PointerGetDatum(s)));
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pfree(s);
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r = ltree_concat(tmp, a);
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pfree(tmp);
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PG_FREE_IF_COPY(a, 1);
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PG_FREE_IF_COPY(b, 0);
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PG_RETURN_POINTER(r);
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}
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ltree *
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lca_inner(ltree **a, int len)
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{
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int tmp,
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num = ((*a)->numlevel) ? (*a)->numlevel - 1 : 0;
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ltree **ptr = a + 1;
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int i,
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reslen = LTREE_HDRSIZE;
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ltree_level *l1,
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*l2;
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ltree *res;
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if ((*a)->numlevel == 0)
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return NULL;
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while (ptr - a < len)
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{
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if ((*ptr)->numlevel == 0)
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return NULL;
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else if ((*ptr)->numlevel == 1)
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num = 0;
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else
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{
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l1 = LTREE_FIRST(*a);
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l2 = LTREE_FIRST(*ptr);
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tmp = num;
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num = 0;
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for (i = 0; i < Min(tmp, (*ptr)->numlevel - 1); i++)
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{
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if (l1->len == l2->len && memcmp(l1->name, l2->name, l1->len) == 0)
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num = i + 1;
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else
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break;
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l1 = LEVEL_NEXT(l1);
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l2 = LEVEL_NEXT(l2);
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}
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}
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ptr++;
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}
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l1 = LTREE_FIRST(*a);
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for (i = 0; i < num; i++)
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{
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reslen += MAXALIGN(l1->len + LEVEL_HDRSIZE);
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l1 = LEVEL_NEXT(l1);
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}
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res = (ltree *) palloc(reslen);
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SET_VARSIZE(res, reslen);
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res->numlevel = num;
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l1 = LTREE_FIRST(*a);
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l2 = LTREE_FIRST(res);
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for (i = 0; i < num; i++)
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{
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memcpy(l2, l1, MAXALIGN(l1->len + LEVEL_HDRSIZE));
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l1 = LEVEL_NEXT(l1);
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l2 = LEVEL_NEXT(l2);
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}
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return res;
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}
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Datum
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lca(PG_FUNCTION_ARGS)
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{
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int i;
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ltree **a,
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*res;
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a = (ltree **) palloc(sizeof(ltree *) * fcinfo->nargs);
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for (i = 0; i < fcinfo->nargs; i++)
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a[i] = PG_GETARG_LTREE(i);
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res = lca_inner(a, (int) fcinfo->nargs);
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for (i = 0; i < fcinfo->nargs; i++)
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PG_FREE_IF_COPY(a[i], i);
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pfree(a);
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if (res)
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PG_RETURN_POINTER(res);
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else
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PG_RETURN_NULL();
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}
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Datum
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text2ltree(PG_FUNCTION_ARGS)
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{
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text *in = PG_GETARG_TEXT_PP(0);
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char *s;
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ltree *out;
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s = text_to_cstring(in);
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out = (ltree *) DatumGetPointer(DirectFunctionCall1(ltree_in,
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PointerGetDatum(s)));
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pfree(s);
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PG_FREE_IF_COPY(in, 0);
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PG_RETURN_POINTER(out);
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}
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Datum
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ltree2text(PG_FUNCTION_ARGS)
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{
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ltree *in = PG_GETARG_LTREE(0);
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char *ptr;
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int i;
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ltree_level *curlevel;
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text *out;
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out = (text *) palloc(VARSIZE(in) + VARHDRSZ);
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ptr = VARDATA(out);
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curlevel = LTREE_FIRST(in);
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for (i = 0; i < in->numlevel; i++)
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{
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if (i != 0)
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{
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|
*ptr = '.';
|
|
ptr++;
|
|
}
|
|
memcpy(ptr, curlevel->name, curlevel->len);
|
|
ptr += curlevel->len;
|
|
curlevel = LEVEL_NEXT(curlevel);
|
|
}
|
|
|
|
SET_VARSIZE(out, ptr - ((char *) out));
|
|
PG_FREE_IF_COPY(in, 0);
|
|
|
|
PG_RETURN_POINTER(out);
|
|
}
|
|
|
|
|
|
#define DEFAULT_PARENT_SEL 0.001
|
|
|
|
/*
|
|
* ltreeparentsel - Selectivity of parent relationship for ltree data types.
|
|
*/
|
|
Datum
|
|
ltreeparentsel(PG_FUNCTION_ARGS)
|
|
{
|
|
PlannerInfo *root = (PlannerInfo *) PG_GETARG_POINTER(0);
|
|
Oid operator = PG_GETARG_OID(1);
|
|
List *args = (List *) PG_GETARG_POINTER(2);
|
|
int varRelid = PG_GETARG_INT32(3);
|
|
VariableStatData vardata;
|
|
Node *other;
|
|
bool varonleft;
|
|
double selec;
|
|
|
|
/*
|
|
* If expression is not variable <@ something or something <@ variable,
|
|
* then punt and return a default estimate.
|
|
*/
|
|
if (!get_restriction_variable(root, args, varRelid,
|
|
&vardata, &other, &varonleft))
|
|
PG_RETURN_FLOAT8(DEFAULT_PARENT_SEL);
|
|
|
|
/*
|
|
* If the something is a NULL constant, assume operator is strict and
|
|
* return zero, ie, operator will never return TRUE.
|
|
*/
|
|
if (IsA(other, Const) &&
|
|
((Const *) other)->constisnull)
|
|
{
|
|
ReleaseVariableStats(vardata);
|
|
PG_RETURN_FLOAT8(0.0);
|
|
}
|
|
|
|
if (IsA(other, Const))
|
|
{
|
|
/* Variable is being compared to a known non-null constant */
|
|
Datum constval = ((Const *) other)->constvalue;
|
|
FmgrInfo contproc;
|
|
double mcvsum;
|
|
double mcvsel;
|
|
double nullfrac;
|
|
int hist_size;
|
|
|
|
fmgr_info(get_opcode(operator), &contproc);
|
|
|
|
/*
|
|
* Is the constant "<@" to any of the column's most common values?
|
|
*/
|
|
mcvsel = mcv_selectivity(&vardata, &contproc, constval, varonleft,
|
|
&mcvsum);
|
|
|
|
/*
|
|
* If the histogram is large enough, see what fraction of it the
|
|
* constant is "<@" to, and assume that's representative of the
|
|
* non-MCV population. Otherwise use the default selectivity for the
|
|
* non-MCV population.
|
|
*/
|
|
selec = histogram_selectivity(&vardata, &contproc,
|
|
constval, varonleft,
|
|
10, 1, &hist_size);
|
|
if (selec < 0)
|
|
{
|
|
/* Nope, fall back on default */
|
|
selec = DEFAULT_PARENT_SEL;
|
|
}
|
|
else if (hist_size < 100)
|
|
{
|
|
/*
|
|
* For histogram sizes from 10 to 100, we combine the histogram
|
|
* and default selectivities, putting increasingly more trust in
|
|
* the histogram for larger sizes.
|
|
*/
|
|
double hist_weight = hist_size / 100.0;
|
|
|
|
selec = selec * hist_weight +
|
|
DEFAULT_PARENT_SEL * (1.0 - hist_weight);
|
|
}
|
|
|
|
/* In any case, don't believe extremely small or large estimates. */
|
|
if (selec < 0.0001)
|
|
selec = 0.0001;
|
|
else if (selec > 0.9999)
|
|
selec = 0.9999;
|
|
|
|
if (HeapTupleIsValid(vardata.statsTuple))
|
|
nullfrac = ((Form_pg_statistic) GETSTRUCT(vardata.statsTuple))->stanullfrac;
|
|
else
|
|
nullfrac = 0.0;
|
|
|
|
/*
|
|
* Now merge the results from the MCV and histogram calculations,
|
|
* realizing that the histogram covers only the non-null values that
|
|
* are not listed in MCV.
|
|
*/
|
|
selec *= 1.0 - nullfrac - mcvsum;
|
|
selec += mcvsel;
|
|
}
|
|
else
|
|
selec = DEFAULT_PARENT_SEL;
|
|
|
|
ReleaseVariableStats(vardata);
|
|
|
|
/* result should be in range, but make sure... */
|
|
CLAMP_PROBABILITY(selec);
|
|
|
|
PG_RETURN_FLOAT8((float8) selec);
|
|
}
|