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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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9
src/test/regress/expected/tsearch.out
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@ -1459,13 +1459,14 @@ select * from pendtest where 'ipi:*'::tsquery @@ ts;
--check OP_PHRASE on index
create temp table phrase_index_test(fts tsvector);
insert into phrase_index_test values('A fat cat has just eaten a rat.');
insert into phrase_index_test values ('A fat cat has just eaten a rat.');
insert into phrase_index_test values (to_tsvector('english', 'A fat cat has just eaten a rat.'));
create index phrase_index_test_idx on phrase_index_test using gin(fts);
set enable_seqscan = off;
select * from phrase_index_test where fts @@ phraseto_tsquery('english', 'fat cat');
fts
-------------------------------------------------
'A' 'a' 'cat' 'eaten' 'fat' 'has' 'just' 'rat.'
fts
-----------------------------------
'cat':3 'eaten':6 'fat':2 'rat':8
(1 row)
set enable_seqscan = on;

3
src/test/regress/sql/tsearch.sql
View File

@ -482,7 +482,8 @@ select * from pendtest where 'ipi:*'::tsquery @@ ts;
--check OP_PHRASE on index
create temp table phrase_index_test(fts tsvector);
insert into phrase_index_test values('A fat cat has just eaten a rat.');
insert into phrase_index_test values ('A fat cat has just eaten a rat.');
insert into phrase_index_test values (to_tsvector('english', 'A fat cat has just eaten a rat.'));
create index phrase_index_test_idx on phrase_index_test using gin(fts);
set enable_seqscan = off;
select * from phrase_index_test where fts @@ phraseto_tsquery('english', 'fat cat');