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New features for tsearch2:

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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
This commit is contained in:
Teodor Sigaev
2005-11-08 17:08:46 +00:00
parent 6521ea008e
commit 0645663e6c
14 changed files with 1876 additions and 114 deletions
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76
contrib/tsearch2/query_support.c Normal file
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@@ -0,0 +1,76 @@
#include "postgres.h"
#include "fmgr.h"
#include "query_util.h"
PG_FUNCTION_INFO_V1(tsquery_numnode);
Datum tsquery_numnode(PG_FUNCTION_ARGS);
Datum
tsquery_numnode(PG_FUNCTION_ARGS) {
QUERYTYPE *query = (QUERYTYPE *) DatumGetPointer(PG_DETOAST_DATUM_COPY(PG_GETARG_DATUM(0)));
int nnode = query->size;
PG_FREE_IF_COPY(query,0);
PG_RETURN_INT32(nnode);
}
static int
CompareTSQ( QUERYTYPE *a, QUERYTYPE *b ) {
if ( a->size != b->size ) {
return ( a->size < b->size ) ? -1 : 1;
} else if ( a->len != b->len ) {
return ( a->len < b->len ) ? -1 : 1;
} else {
QTNode *an = QT2QTN( GETQUERY(a), GETOPERAND(a) );
QTNode *bn = QT2QTN( GETQUERY(b), GETOPERAND(b) );
int res = QTNodeCompare(an, bn);
QTNFree(an);
QTNFree(bn);
return res;
}
return 0;
}
PG_FUNCTION_INFO_V1(tsquery_cmp); \
Datum tsquery_cmp(PG_FUNCTION_ARGS);
Datum
tsquery_cmp(PG_FUNCTION_ARGS) {
QUERYTYPE *a = (QUERYTYPE *) DatumGetPointer(PG_DETOAST_DATUM_COPY(PG_GETARG_DATUM(0)));
QUERYTYPE *b = (QUERYTYPE *) DatumGetPointer(PG_DETOAST_DATUM_COPY(PG_GETARG_DATUM(1)));
int res = CompareTSQ(a,b);
PG_FREE_IF_COPY(a,0);
PG_FREE_IF_COPY(b,1);
PG_RETURN_INT32(res);
}
#define CMPFUNC( NAME, ACTION ) \
PG_FUNCTION_INFO_V1(NAME); \
Datum NAME(PG_FUNCTION_ARGS); \
\
Datum \
NAME(PG_FUNCTION_ARGS) { \
QUERYTYPE *a = (QUERYTYPE *) DatumGetPointer(PG_DETOAST_DATUM_COPY(PG_GETARG_DATUM(0))); \
QUERYTYPE *b = (QUERYTYPE *) DatumGetPointer(PG_DETOAST_DATUM_COPY(PG_GETARG_DATUM(1))); \
int res = CompareTSQ(a,b); \
\
PG_FREE_IF_COPY(a,0); \
PG_FREE_IF_COPY(b,1); \
\
PG_RETURN_BOOL( ACTION ); \
}
CMPFUNC( tsquery_lt, res <0 );
CMPFUNC( tsquery_le, res<=0 );
CMPFUNC( tsquery_eq, res==0 );
CMPFUNC( tsquery_ge, res>=0 );
CMPFUNC( tsquery_gt, res >0 );
CMPFUNC( tsquery_ne, res!=0 );