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Hello, thank you for this great extension!
I think I've spotted some problem. When searching
- ... with a phrase-query like
foo <-> bar - ... using an index of the
rum_tsvector_addon_opsoperator class - ... it doesn't find anything.
Let's setup a test table with text values a a, a b, a c and so on.
create extension rum;
create table text_table (id1 serial, t text);
create table rum_tbl (id serial, tsv tsvector);
insert into text_table(t) select chr(i) || ' ' || chr(j) from generate_series(65,90) i, generate_series(65,90) j;
insert into rum_tbl(tsv) select to_tsvector('simple', t) from text_table;Without any index we can query on a <-> b, which works like expected:
select * from rum_tbl where tsv @@ to_tsquery('simple', 'a <-> b'); id | tsv
----+-------------
2 | 'a':1 'b':2
(1 row)
Now let's create an index using the rum_tsvector_addon_ops operator class:
create index rum_tbl_idx_addon
on rum_tbl using rum (tsv rum_tsvector_addon_ops, id)
with (attach ='id', to = 'tsv');The same query now fails to return the matching row:
select * from rum_tbl where tsv @@ to_tsquery('simple', 'a <-> b'); id | tsv
----+-----
(0 rows)
Explain analyze says:
Bitmap Heap Scan on rum_tbl (cost=3.33..6.45 rows=4 width=28) (actual time=0.097..0.097 rows=0 loops=1)
Recheck Cond: (tsv @@ '''a'' <-> ''b'''::tsquery)
-> Bitmap Index Scan on rum_tbl_idx_addon (cost=0.00..3.33 rows=4 width=0) (actual time=0.093..0.093 rows=0 loop
s=1)
Index Cond: (tsv @@ '''a'' <-> ''b'''::tsquery)
A query using an AND operator works correctly:
select * from rum_tbl where tsv @@ to_tsquery('simple', 'a & b');
-- ... result has 2 rowsInterestingly, the phrase-query also works correctly if we only have a rum_tsvector_ops index:
drop index rum_tbl_idx_addon;
create index rum_tbl_idx
on rum_tbl using rum (tsv rum_tsvector_ops);
select * from rum_tbl where tsv @@ to_tsquery('simple', 'a <-> b');
-- ... result has 1 rowTested with PostgreSQL 11.5 and RUM 1.3.7.
Any help greatly appreciated. Thank you in advance!
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