0645663e6c
1 Comparison operation for tsquery
2 Btree index on tsquery
3 numnode(tsquery) - returns 'length' of tsquery
4 tsquery @ tsquery, tsquery ~ tsquery - contains, contained for tsquery.
Note: They don't gurantee exact result, only MAY BE, so it
useful only for speed up rewrite functions
5 GiST index support for @,~
6 rewrite():
select rewrite(orig, what, to);
select rewrite(ARRAY[orig, what, to]) from tsquery_table;
select rewrite(orig, 'select what, to from tsquery_table;');
7 significantly improve cover algorithm
77 lines
2.0 KiB
C
77 lines
2.0 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 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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