mirror of
https://git.postgresql.org/git/postgresql.git
synced 2024-12-27 08:39:28 +08:00
c52795d18a
- supports multibyte encodings
- more strict rules for lexemes
- flex isn't used
Add:
- tsquery plainto_tsquery(text)
Function makes tsquery from plain text.
- &&, ||, !! operation for tsquery for combining
tsquery from it's parts: 'foo & bar' || 'asd' => 'foo & bar | asd'
188 lines
4.4 KiB
C
188 lines
4.4 KiB
C
#include "postgres.h"
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#include "fmgr.h"
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#include "query_util.h"
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PG_FUNCTION_INFO_V1(tsquery_numnode);
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Datum tsquery_numnode(PG_FUNCTION_ARGS);
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Datum
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tsquery_numnode(PG_FUNCTION_ARGS) {
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QUERYTYPE *query = (QUERYTYPE *) DatumGetPointer(PG_DETOAST_DATUM_COPY(PG_GETARG_DATUM(0)));
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int nnode = query->size;
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PG_FREE_IF_COPY(query,0);
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PG_RETURN_INT32(nnode);
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}
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static QTNode*
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join_tsqueries(QUERYTYPE *a, QUERYTYPE *b) {
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QTNode *res=(QTNode*)palloc0( sizeof(QTNode) );
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res->flags |= QTN_NEEDFREE;
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res->valnode = (ITEM*)palloc0( sizeof(ITEM) );
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res->valnode->type = OPR;
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res->child = (QTNode**)palloc0( sizeof(QTNode*)*2 );
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res->child[0] = QT2QTN( GETQUERY(b), GETOPERAND(b) );
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res->child[1] = QT2QTN( GETQUERY(a), GETOPERAND(a) );
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res->nchild = 2;
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return res;
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}
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PG_FUNCTION_INFO_V1(tsquery_and);
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Datum tsquery_and(PG_FUNCTION_ARGS);
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Datum
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tsquery_and(PG_FUNCTION_ARGS) {
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QUERYTYPE *a = (QUERYTYPE *) DatumGetPointer(PG_DETOAST_DATUM_COPY(PG_GETARG_DATUM(0)));
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QUERYTYPE *b = (QUERYTYPE *) DatumGetPointer(PG_DETOAST_DATUM_COPY(PG_GETARG_DATUM(1)));
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QTNode *res;
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QUERYTYPE *query;
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if ( a->size == 0 ) {
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PG_FREE_IF_COPY(a,1);
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PG_RETURN_POINTER(b);
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} else if ( b->size == 0 ) {
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PG_FREE_IF_COPY(b,1);
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PG_RETURN_POINTER(a);
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}
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res = join_tsqueries(a, b);
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res->valnode->val = '&';
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query = QTN2QT( res, PlainMemory );
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QTNFree(res);
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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(query);
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}
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PG_FUNCTION_INFO_V1(tsquery_or);
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Datum tsquery_or(PG_FUNCTION_ARGS);
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Datum
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tsquery_or(PG_FUNCTION_ARGS) {
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QUERYTYPE *a = (QUERYTYPE *) DatumGetPointer(PG_DETOAST_DATUM_COPY(PG_GETARG_DATUM(0)));
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QUERYTYPE *b = (QUERYTYPE *) DatumGetPointer(PG_DETOAST_DATUM_COPY(PG_GETARG_DATUM(1)));
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QTNode *res;
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QUERYTYPE *query;
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if ( a->size == 0 ) {
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PG_FREE_IF_COPY(a,1);
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PG_RETURN_POINTER(b);
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} else if ( b->size == 0 ) {
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PG_FREE_IF_COPY(b,1);
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PG_RETURN_POINTER(a);
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}
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res = join_tsqueries(a, b);
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res->valnode->val = '|';
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query = QTN2QT( res, PlainMemory );
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QTNFree(res);
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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(query);
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}
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PG_FUNCTION_INFO_V1(tsquery_not);
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Datum tsquery_not(PG_FUNCTION_ARGS);
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Datum
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tsquery_not(PG_FUNCTION_ARGS) {
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QUERYTYPE *a = (QUERYTYPE *) DatumGetPointer(PG_DETOAST_DATUM_COPY(PG_GETARG_DATUM(0)));
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QTNode *res;
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QUERYTYPE *query;
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if ( a->size == 0 )
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PG_RETURN_POINTER(a);
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res=(QTNode*)palloc0( sizeof(QTNode) );
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res->flags |= QTN_NEEDFREE;
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res->valnode = (ITEM*)palloc0( sizeof(ITEM) );
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res->valnode->type = OPR;
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res->valnode->val = '!';
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res->child = (QTNode**)palloc0( sizeof(QTNode*) );
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res->child[0] = QT2QTN( GETQUERY(a), GETOPERAND(a) );
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res->nchild = 1;
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query = QTN2QT( res, PlainMemory );
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QTNFree(res);
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PG_FREE_IF_COPY(a,0);
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PG_RETURN_POINTER(query);
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}
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static int
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CompareTSQ( QUERYTYPE *a, QUERYTYPE *b ) {
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if ( a->size != b->size ) {
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return ( a->size < b->size ) ? -1 : 1;
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} else if ( a->len != b->len ) {
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return ( a->len < b->len ) ? -1 : 1;
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} else {
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QTNode *an = QT2QTN( GETQUERY(a), GETOPERAND(a) );
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QTNode *bn = QT2QTN( GETQUERY(b), GETOPERAND(b) );
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int res = QTNodeCompare(an, bn);
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QTNFree(an);
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QTNFree(bn);
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return res;
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}
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return 0;
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}
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PG_FUNCTION_INFO_V1(tsquery_cmp); \
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Datum tsquery_cmp(PG_FUNCTION_ARGS);
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Datum
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tsquery_cmp(PG_FUNCTION_ARGS) {
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QUERYTYPE *a = (QUERYTYPE *) DatumGetPointer(PG_DETOAST_DATUM_COPY(PG_GETARG_DATUM(0)));
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QUERYTYPE *b = (QUERYTYPE *) DatumGetPointer(PG_DETOAST_DATUM_COPY(PG_GETARG_DATUM(1)));
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int res = CompareTSQ(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_INT32(res);
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}
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#define CMPFUNC( NAME, ACTION ) \
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PG_FUNCTION_INFO_V1(NAME); \
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Datum NAME(PG_FUNCTION_ARGS); \
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\
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Datum \
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NAME(PG_FUNCTION_ARGS) { \
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QUERYTYPE *a = (QUERYTYPE *) DatumGetPointer(PG_DETOAST_DATUM_COPY(PG_GETARG_DATUM(0))); \
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QUERYTYPE *b = (QUERYTYPE *) DatumGetPointer(PG_DETOAST_DATUM_COPY(PG_GETARG_DATUM(1))); \
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int res = CompareTSQ(a,b); \
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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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\
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PG_RETURN_BOOL( ACTION ); \
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}
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CMPFUNC( tsquery_lt, res <0 );
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CMPFUNC( tsquery_le, res<=0 );
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CMPFUNC( tsquery_eq, res==0 );
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CMPFUNC( tsquery_ge, res>=0 );
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CMPFUNC( tsquery_gt, res >0 );
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CMPFUNC( tsquery_ne, res!=0 );
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