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36ab600511
methods in a short-lived memory context, there is no need for GiST methods to do their own manual (and error-prone) memory management.
590 lines
13 KiB
C
590 lines
13 KiB
C
#include "btree_gist.h"
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#include "utils/pg_locale.h"
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#include "btree_utils_var.h"
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PG_FUNCTION_INFO_V1(gbt_var_decompress);
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Datum gbt_var_decompress(PG_FUNCTION_ARGS);
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Datum
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gbt_var_decompress(PG_FUNCTION_ARGS)
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{
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GISTENTRY *entry = (GISTENTRY *) PG_GETARG_POINTER(0);
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GBT_VARKEY *key = (GBT_VARKEY *) DatumGetPointer(PG_DETOAST_DATUM(entry->key));
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if (key != (GBT_VARKEY *) DatumGetPointer(entry->key))
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{
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GISTENTRY *retval = (GISTENTRY *) palloc(sizeof(GISTENTRY));
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gistentryinit(*retval, PointerGetDatum(key),
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entry->rel, entry->page,
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entry->offset, VARSIZE(key), FALSE);
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PG_RETURN_POINTER(retval);
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}
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PG_RETURN_POINTER(entry);
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}
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/* Returns a better readable representaion of variable key ( sets pointer ) */
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GBT_VARKEY_R
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gbt_var_key_readable(const GBT_VARKEY * k)
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{
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GBT_VARKEY_R r;
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r.lower = (bytea *) &(((char *) k)[VARHDRSZ]);
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if (VARSIZE(k) > (VARHDRSZ + (VARSIZE(r.lower))))
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r.upper = (bytea *) &(((char *) k)[VARHDRSZ + INTALIGN(VARSIZE(r.lower))]);
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else
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r.upper = r.lower;
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return r;
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}
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GBT_VARKEY *
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gbt_var_key_copy(const GBT_VARKEY_R * u, bool force_node)
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{
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GBT_VARKEY *r = NULL;
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if (u->lower == u->upper && !force_node)
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{ /* leaf key mode */
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r = (GBT_VARKEY *) palloc(VARSIZE(u->lower) + VARHDRSZ);
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memcpy((void *) VARDATA(r), (void *) u->lower, VARSIZE(u->lower));
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r->vl_len = VARSIZE(u->lower) + VARHDRSZ;
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}
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else
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{ /* node key mode */
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r = (GBT_VARKEY *) palloc(INTALIGN(VARSIZE(u->lower)) + VARSIZE(u->upper) + VARHDRSZ);
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memcpy((void *) VARDATA(r), (void *) u->lower, VARSIZE(u->lower));
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memcpy((void *) &(((char *) r)[VARHDRSZ + INTALIGN(VARSIZE(u->lower))]), (void *) u->upper, VARSIZE(u->upper));
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r->vl_len = INTALIGN(VARSIZE(u->lower)) + VARSIZE(u->upper) + VARHDRSZ;
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}
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return r;
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}
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static GBT_VARKEY *
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gbt_var_leaf2node(GBT_VARKEY * leaf, const gbtree_vinfo * tinfo)
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{
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GBT_VARKEY *out = leaf;
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if (tinfo->f_l2n)
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out = (*tinfo->f_l2n) (leaf);
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return out;
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}
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/*
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* returns the common prefix length of a node key
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*/
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static int32
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gbt_var_node_cp_len(const GBT_VARKEY * node, const gbtree_vinfo * tinfo)
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{
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int32 i;
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int32 s = (tinfo->str) ? (1) : (0);
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GBT_VARKEY_R r = gbt_var_key_readable(node);
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int32 t1len = VARSIZE(r.lower) - VARHDRSZ - s;
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int32 t2len = VARSIZE(r.upper) - VARHDRSZ - s;
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int32 ml = Min(t1len, t2len);
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char *p1 = VARDATA(r.lower),
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*p2 = VARDATA(r.upper);
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for (i = 0; i < ml; i++)
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{
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if (*p1 != *p2)
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return i;
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p1++;
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p2++;
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}
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return (ml);
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}
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/*
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* returns true, if query matches prefix using common prefix
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*/
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static bool
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gbt_bytea_pf_match(const bytea *pf, const bytea *query, const gbtree_vinfo * tinfo)
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{
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int k;
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int32 s = (tinfo->str) ? (1) : (0);
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bool out = FALSE;
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int32 qlen = VARSIZE(query) - VARHDRSZ - s;
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int32 nlen = VARSIZE(pf) - VARHDRSZ - s;
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if (nlen <= qlen)
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{
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char *q = VARDATA(query);
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char *n = VARDATA(pf);
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out = TRUE;
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for (k = 0; k < nlen; k++)
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{
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if (*n != *q)
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{
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out = FALSE;
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break;
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}
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if (k < (nlen - 1))
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{
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q++;
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n++;
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}
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}
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}
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return out;
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}
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/*
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* returns true, if query matches node using common prefix
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*/
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static bool
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gbt_var_node_pf_match(const GBT_VARKEY_R * node, const bytea *query, const gbtree_vinfo * tinfo)
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{
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return (
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gbt_bytea_pf_match(node->lower, query, tinfo) ||
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gbt_bytea_pf_match(node->upper, query, tinfo)
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);
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}
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/*
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* truncates / compresses the node key
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*/
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static GBT_VARKEY *
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gbt_var_node_truncate(const GBT_VARKEY * node, int32 length, const gbtree_vinfo * tinfo)
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{
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int32 s = (tinfo->str) ? (1) : (0);
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GBT_VARKEY *out = NULL;
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GBT_VARKEY_R r = gbt_var_key_readable(node);
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int32 len1 = VARSIZE(r.lower) - VARHDRSZ;
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int32 len2 = VARSIZE(r.upper) - VARHDRSZ;
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int32 si = 0;
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if (tinfo->str)
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length++; /* because of tailing '\0' */
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len1 = Min(len1, length);
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len2 = Min(len2, length);
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si = 2 * VARHDRSZ + INTALIGN(VARHDRSZ + len1) + len2;
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out = (GBT_VARKEY *) palloc(si);
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out->vl_len = si;
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memcpy((void *) &(((char *) out)[VARHDRSZ]), (void *) r.lower, len1 + VARHDRSZ - s);
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memcpy((void *) &(((char *) out)[VARHDRSZ + INTALIGN(VARHDRSZ + len1)]), (void *) r.upper, len2 + VARHDRSZ - s);
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if (tinfo->str)
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{
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((char *) out)[VARHDRSZ + INTALIGN(VARHDRSZ + len1) - 1] = '\0';
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((char *) out)[2 * VARHDRSZ + INTALIGN(VARHDRSZ + len1) + len2 - 1] = '\0';
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}
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*((int32 *) &(((char *) out)[VARHDRSZ])) = len1 + VARHDRSZ;
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*((int32 *) &(((char *) out)[VARHDRSZ + INTALIGN(VARHDRSZ + len1)])) = len2 + VARHDRSZ;
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return out;
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}
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void
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gbt_var_bin_union(Datum *u, GBT_VARKEY * e, const gbtree_vinfo * tinfo)
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{
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GBT_VARKEY *nk = NULL;
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GBT_VARKEY *tmp = NULL;
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GBT_VARKEY_R nr;
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GBT_VARKEY_R eo = gbt_var_key_readable(e);
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if (eo.lower == eo.upper) /* leaf */
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{
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tmp = gbt_var_leaf2node(e, tinfo);
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if (tmp != e)
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eo = gbt_var_key_readable(tmp);
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}
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if (DatumGetPointer(*u))
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{
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GBT_VARKEY_R ro = gbt_var_key_readable((GBT_VARKEY *) DatumGetPointer(*u));
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if ((*tinfo->f_cmp) ((bytea *) ro.lower, (bytea *) eo.lower) > 0)
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{
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nr.lower = eo.lower;
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nr.upper = ro.upper;
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nk = gbt_var_key_copy(&nr, TRUE);
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}
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if ((*tinfo->f_cmp) ((bytea *) ro.upper, (bytea *) eo.upper) < 0)
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{
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nr.upper = eo.upper;
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nr.lower = ro.lower;
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nk = gbt_var_key_copy(&nr, TRUE);
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}
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if (nk)
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*u = PointerGetDatum(nk);
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}
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else
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{
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nr.lower = eo.lower;
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nr.upper = eo.upper;
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*u = PointerGetDatum(gbt_var_key_copy(&nr, TRUE));
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}
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}
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GISTENTRY *
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gbt_var_compress(GISTENTRY *entry, const gbtree_vinfo * tinfo)
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{
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GISTENTRY *retval;
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if (entry->leafkey)
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{
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GBT_VARKEY *r = NULL;
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bytea *leaf = (bytea *) DatumGetPointer(PG_DETOAST_DATUM(entry->key));
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GBT_VARKEY_R u;
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u.lower = u.upper = leaf;
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r = gbt_var_key_copy(&u, FALSE);
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retval = palloc(sizeof(GISTENTRY));
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gistentryinit(*retval, PointerGetDatum(r),
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entry->rel, entry->page,
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entry->offset, VARSIZE(r), TRUE);
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}
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else
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retval = entry;
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return (retval);
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}
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GBT_VARKEY *
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gbt_var_union(const GistEntryVector *entryvec, int32 *size, const gbtree_vinfo * tinfo)
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{
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int i = 0,
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numranges = entryvec->n;
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GBT_VARKEY *cur;
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Datum out;
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GBT_VARKEY_R rk;
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*size = sizeof(GBT_VARKEY);
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cur = (GBT_VARKEY *) DatumGetPointer(entryvec->vector[0].key);
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rk = gbt_var_key_readable(cur);
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out = PointerGetDatum(gbt_var_key_copy(&rk, TRUE));
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for (i = 1; i < numranges; i++)
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{
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cur = (GBT_VARKEY *) DatumGetPointer(entryvec->vector[i].key);
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gbt_var_bin_union(&out, cur, tinfo);
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}
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/* Truncate (=compress) key */
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if (tinfo->trnc)
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{
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int32 plen;
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GBT_VARKEY *trc = NULL;
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plen = gbt_var_node_cp_len((GBT_VARKEY *) DatumGetPointer(out), tinfo);
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trc = gbt_var_node_truncate((GBT_VARKEY *) DatumGetPointer(out), plen + 1, tinfo);
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out = PointerGetDatum(trc);
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}
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return ((GBT_VARKEY *) DatumGetPointer(out));
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}
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bool
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gbt_var_same(bool *result, const Datum d1, const Datum d2, const gbtree_vinfo * tinfo)
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{
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GBT_VARKEY *t1 = (GBT_VARKEY *) DatumGetPointer(d1);
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GBT_VARKEY *t2 = (GBT_VARKEY *) DatumGetPointer(d2);
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GBT_VARKEY_R r1,
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r2;
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r1 = gbt_var_key_readable(t1);
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r2 = gbt_var_key_readable(t2);
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if (t1 && t2)
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{
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*result = (((*tinfo->f_cmp) ((bytea *) r1.lower, (bytea *) r2.lower) == 0
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&& (*tinfo->f_cmp) ((bytea *) r1.upper, (bytea *) r2.upper) == 0) ? TRUE : FALSE);
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}
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else
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*result = (t1 == NULL && t2 == NULL) ? TRUE : FALSE;
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PG_RETURN_POINTER(result);
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}
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float *
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gbt_var_penalty(float *res, const GISTENTRY *o, const GISTENTRY *n, const gbtree_vinfo * tinfo)
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{
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GBT_VARKEY *orge = (GBT_VARKEY *) DatumGetPointer(o->key);
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GBT_VARKEY *newe = (GBT_VARKEY *) DatumGetPointer(n->key);
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GBT_VARKEY_R ok,
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nk;
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GBT_VARKEY *tmp = NULL;
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int32 s = (tinfo->str) ? (1) : (0);
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*res = 0.0;
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nk = gbt_var_key_readable(newe);
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if (nk.lower == nk.upper) /* leaf */
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{
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tmp = gbt_var_leaf2node(newe, tinfo);
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if (tmp != newe)
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nk = gbt_var_key_readable(tmp);
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}
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ok = gbt_var_key_readable(orge);
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if ((VARSIZE(ok.lower) - VARHDRSZ) == s && (VARSIZE(ok.upper) - VARHDRSZ) == s)
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*res = 0.0;
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else if (!(
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(
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((*tinfo->f_cmp) (nk.lower, ok.lower) >= 0 || gbt_bytea_pf_match(ok.lower, nk.lower, tinfo)) &&
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((*tinfo->f_cmp) (nk.upper, ok.upper) <= 0 || gbt_bytea_pf_match(ok.upper, nk.upper, tinfo))
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)
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))
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{
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Datum d = PointerGetDatum(0);
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double dres = 0.0;
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int32 ol,
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ul;
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gbt_var_bin_union(&d, orge, tinfo);
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ol = gbt_var_node_cp_len((GBT_VARKEY *) DatumGetPointer(d), tinfo);
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gbt_var_bin_union(&d, newe, tinfo);
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ul = gbt_var_node_cp_len((GBT_VARKEY *) DatumGetPointer(d), tinfo);
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if (ul < ol)
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{
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dres = (ol - ul); /* lost of common prefix len */
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}
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else
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{
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GBT_VARKEY_R uk = gbt_var_key_readable((GBT_VARKEY *) DatumGetPointer(d));
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if (tinfo->str)
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{
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dres = (VARDATA(ok.lower)[ul] - VARDATA(uk.lower)[ul]) +
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(VARDATA(uk.upper)[ul] - VARDATA(ok.upper)[ul]);
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}
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else
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{
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char tmp[4];
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tmp[0] = ((VARSIZE(ok.lower) - VARHDRSZ) == ul) ? (CHAR_MIN) : (VARDATA(ok.lower)[ul]);
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tmp[1] = ((VARSIZE(uk.lower) - VARHDRSZ) == ul) ? (CHAR_MIN) : (VARDATA(uk.lower)[ul]);
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tmp[2] = ((VARSIZE(ok.upper) - VARHDRSZ) == ul) ? (CHAR_MIN) : (VARDATA(ok.upper)[ul]);
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tmp[3] = ((VARSIZE(uk.upper) - VARHDRSZ) == ul) ? (CHAR_MIN) : (VARDATA(uk.upper)[ul]);
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dres = (tmp[0] - tmp[1]) +
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(tmp[3] - tmp[2]);
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}
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dres /= 256.0;
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}
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*res += FLT_MIN;
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*res += (float) (dres / ((double) (ol + 1)));
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*res *= (FLT_MAX / (o->rel->rd_att->natts + 1));
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}
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return res;
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}
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/*
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* Fortunately, this sort comparison routine needn't be reentrant...
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*/
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static const gbtree_vinfo *gbt_vsrt_cmp_tinfo;
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static int
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gbt_vsrt_cmp(const void *a, const void *b)
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{
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GBT_VARKEY_R ar = gbt_var_key_readable(((const Vsrt *) a)->t);
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GBT_VARKEY_R br = gbt_var_key_readable(((const Vsrt *) b)->t);
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return (*gbt_vsrt_cmp_tinfo->f_cmp) (ar.lower, br.lower);
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}
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GIST_SPLITVEC *
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gbt_var_picksplit(const GistEntryVector *entryvec, GIST_SPLITVEC *v, const gbtree_vinfo * tinfo)
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{
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OffsetNumber i,
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maxoff = entryvec->n - 1;
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Vsrt *arr;
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int svcntr = 0,
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nbytes;
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char *cur;
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GBT_VARKEY **sv = NULL;
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arr = (Vsrt *) palloc((maxoff + 1) * sizeof(Vsrt));
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nbytes = (maxoff + 2) * sizeof(OffsetNumber);
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v->spl_left = (OffsetNumber *) palloc(nbytes);
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v->spl_right = (OffsetNumber *) palloc(nbytes);
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v->spl_ldatum = PointerGetDatum(0);
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v->spl_rdatum = PointerGetDatum(0);
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v->spl_nleft = 0;
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v->spl_nright = 0;
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sv = palloc(sizeof(bytea *) * (maxoff + 1));
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/* Sort entries */
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for (i = FirstOffsetNumber; i <= maxoff; i = OffsetNumberNext(i))
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{
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GBT_VARKEY_R ro;
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cur = (char *) DatumGetPointer(entryvec->vector[i].key);
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ro = gbt_var_key_readable((GBT_VARKEY *) cur);
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if (ro.lower == ro.upper) /* leaf */
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{
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sv[svcntr] = gbt_var_leaf2node((GBT_VARKEY *) cur, tinfo);
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arr[i].t = sv[svcntr];
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if (sv[svcntr] != (GBT_VARKEY *) cur)
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svcntr++;
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}
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else
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arr[i].t = (GBT_VARKEY *) cur;
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arr[i].i = i;
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}
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/* sort */
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gbt_vsrt_cmp_tinfo = tinfo;
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qsort((void *) &arr[FirstOffsetNumber],
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maxoff - FirstOffsetNumber + 1,
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sizeof(Vsrt),
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gbt_vsrt_cmp);
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/* We do simply create two parts */
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for (i = FirstOffsetNumber; i <= maxoff; i = OffsetNumberNext(i))
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{
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if (i <= (maxoff - FirstOffsetNumber + 1) / 2)
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{
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gbt_var_bin_union(&v->spl_ldatum, arr[i].t, tinfo);
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v->spl_left[v->spl_nleft] = arr[i].i;
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v->spl_nleft++;
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}
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else
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{
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gbt_var_bin_union(&v->spl_rdatum, arr[i].t, tinfo);
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v->spl_right[v->spl_nright] = arr[i].i;
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v->spl_nright++;
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}
|
|
}
|
|
|
|
/* Truncate (=compress) key */
|
|
if (tinfo->trnc)
|
|
{
|
|
int32 ll = gbt_var_node_cp_len((GBT_VARKEY *) DatumGetPointer(v->spl_ldatum), tinfo);
|
|
int32 lr = gbt_var_node_cp_len((GBT_VARKEY *) DatumGetPointer(v->spl_rdatum), tinfo);
|
|
GBT_VARKEY *dl;
|
|
GBT_VARKEY *dr;
|
|
|
|
ll = Max(ll, lr);
|
|
ll++;
|
|
|
|
dl = gbt_var_node_truncate((GBT_VARKEY *) DatumGetPointer(v->spl_ldatum), ll, tinfo);
|
|
dr = gbt_var_node_truncate((GBT_VARKEY *) DatumGetPointer(v->spl_rdatum), ll, tinfo);
|
|
v->spl_ldatum = PointerGetDatum(dl);
|
|
v->spl_rdatum = PointerGetDatum(dr);
|
|
}
|
|
|
|
return v;
|
|
}
|
|
|
|
|
|
/*
|
|
* The GiST consistent method
|
|
*/
|
|
bool
|
|
gbt_var_consistent(
|
|
GBT_VARKEY_R * key,
|
|
const void *query,
|
|
const StrategyNumber *strategy,
|
|
bool is_leaf,
|
|
const gbtree_vinfo * tinfo
|
|
)
|
|
{
|
|
bool retval = FALSE;
|
|
|
|
switch (*strategy)
|
|
{
|
|
case BTLessEqualStrategyNumber:
|
|
if (is_leaf)
|
|
retval = (*tinfo->f_ge) (query, (void *) key->lower);
|
|
else
|
|
retval = (*tinfo->f_cmp) ((bytea *) query, key->lower) >= 0
|
|
|| gbt_var_node_pf_match(key, query, tinfo);
|
|
break;
|
|
case BTLessStrategyNumber:
|
|
if (is_leaf)
|
|
retval = (*tinfo->f_gt) (query, (void *) key->lower);
|
|
else
|
|
retval = (*tinfo->f_cmp) ((bytea *) query, key->lower) >= 0
|
|
|| gbt_var_node_pf_match(key, query, tinfo);
|
|
break;
|
|
case BTEqualStrategyNumber:
|
|
if (is_leaf)
|
|
retval = (*tinfo->f_eq) (query, (void *) key->lower);
|
|
else
|
|
retval = (
|
|
(
|
|
(*tinfo->f_cmp) (key->lower, (bytea *) query) <= 0 &&
|
|
(*tinfo->f_cmp) ((bytea *) query, (void *) key->upper) <= 0
|
|
) || gbt_var_node_pf_match(key, query, tinfo)
|
|
);
|
|
break;
|
|
case BTGreaterStrategyNumber:
|
|
if (is_leaf)
|
|
retval = (*tinfo->f_lt) (query, (void *) key->upper);
|
|
else
|
|
retval = (*tinfo->f_cmp) ((bytea *) query, key->upper) <= 0
|
|
|| gbt_var_node_pf_match(key, query, tinfo);
|
|
break;
|
|
case BTGreaterEqualStrategyNumber:
|
|
if (is_leaf)
|
|
retval = (*tinfo->f_le) (query, (void *) key->upper);
|
|
else
|
|
retval = (*tinfo->f_cmp) ((bytea *) query, key->upper) <= 0
|
|
|| gbt_var_node_pf_match(key, query, tinfo);
|
|
break;
|
|
default:
|
|
retval = FALSE;
|
|
}
|
|
|
|
return (retval);
|
|
}
|