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Do not fallback to AND for FTS phrase operator.

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If there is no positional information of lexemes then phrase operator will not
fallback to AND operator. This change makes needing to modify TS_execute()
interface, because somewhere (in indexes, for example) positional information
is unaccesible and in this cases we need to force fallback to AND.

Per discussion c19fcfec308e6ccd952cdde9e648b505@mail.gmail.com
This commit is contained in:
Teodor Sigaev
2016-06-27 20:47:32 +03:00
parent 028350f619
commit 3dbbd0f02a
7 changed files with 53 additions and 27 deletions
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19
src/include/tsearch/ts_utils.h
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@ -111,8 +111,25 @@ typedef struct ExecPhraseData
WordEntryPos *pos;
} ExecPhraseData;
extern bool TS_execute(QueryItem *curitem, void *checkval, bool calcnot,
/*
* Evaluates tsquery, flags are followe below
*/
extern bool TS_execute(QueryItem *curitem, void *checkval, uint32 flags,
bool (*chkcond) (void *, QueryOperand *, ExecPhraseData *));
#define TS_EXEC_EMPTY (0x00)
/*
* if TS_EXEC_CALC_NOT is not set then NOT expression evaluated to be true,
* used in cases where NOT cannot be accurately computed (GiST) or
* it isn't important (ranking)
*/
#define TS_EXEC_CALC_NOT (0x01)
/*
* Treat OP_PHRASE as OP_AND. Used when posiotional information is not
* accessible, like in consistent methods of GIN/GiST indexes
*/
#define TS_EXEC_PHRASE_AS_AND (0x02)
extern bool tsquery_requires_match(QueryItem *curitem);
/*