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Phrase full text search.

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Patch introduces new text search operator (<-> or <DISTANCE>) into tsquery.
On-disk and binary in/out format of tsquery are backward compatible.
It has two side effect:
- change order for tsquery, so, users, who has a btree index over tsquery,
  should reindex it
- less number of parenthesis in tsquery output, and tsquery becomes more
  readable

Authors: Teodor Sigaev, Oleg Bartunov, Dmitry Ivanov
Reviewers: Alexander Korotkov, Artur Zakirov
This commit is contained in:
Teodor Sigaev
2016-04-07 18:44:18 +03:00
parent 015e88942a
commit bb140506df
30 changed files with 2542 additions and 450 deletions
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11
src/backend/utils/adt/tsquery_util.c
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@ -110,6 +110,10 @@ QTNodeCompare(QTNode *an, QTNode *bn)
if ((res = QTNodeCompare(an->child[i], bn->child[i])) != 0)
return res;
}
if (ao->oper == OP_PHRASE && ao->distance != bo->distance)
return (ao->distance > bo->distance) ? -1 : 1;
return 0;
}
else if (an->valnode->type == QI_VAL)
@ -150,7 +154,7 @@ QTNSort(QTNode *in)
for (i = 0; i < in->nchild; i++)
QTNSort(in->child[i]);
if (in->nchild > 1)
if (in->nchild > 1 && in->valnode->qoperator.oper != OP_PHRASE)
qsort((void *) in->child, in->nchild, sizeof(QTNode *), cmpQTN);
}
@ -190,7 +194,10 @@ QTNTernary(QTNode *in)
{
QTNode *cc = in->child[i];
if (cc->valnode->type == QI_OPR && in->valnode->qoperator.oper == cc->valnode->qoperator.oper)
/* OP_Phrase isn't associative */
if (cc->valnode->type == QI_OPR &&
in->valnode->qoperator.oper == cc->valnode->qoperator.oper &&
in->valnode->qoperator.oper != OP_PHRASE)
{
int oldnchild = in->nchild;