Received: from malur.postgresql.org ([217.196.149.56]) by arkaria.postgresql.org with esmtp (Exim 4.84_2) (envelope-from ) id 1ag7L4-0000tr-EP for pgsql-performance@arkaria.postgresql.org; Wed, 16 Mar 2016 09:01:59 +0000 Received: from localhost ([127.0.0.1] helo=postgresql.org) by malur.postgresql.org with smtp (Exim 4.84_2) (envelope-from ) id 1ag7L3-0004Uc-SY for pgsql-performance@arkaria.postgresql.org; Wed, 16 Mar 2016 09:01:57 +0000 Received: from makus.postgresql.org ([2001:4800:1501:1::229]) by malur.postgresql.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_CBC_SHA384:256) (Exim 4.84_2) (envelope-from ) id 1ag7JM-0000YQ-4b for pgsql-performance@postgresql.org; Wed, 16 Mar 2016 09:00:12 +0000 Received: from post.visena.com ([46.226.10.50]) by makus.postgresql.org with esmtps (TLS1.2:DHE_RSA_AES_256_CBC_SHA1:256) (Exim 4.84_2) (envelope-from ) id 1ag7JI-0001oC-Cr for pgsql-performance@postgresql.org; Wed, 16 Mar 2016 09:00:10 +0000 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=visena.com; s=20141101.wh; h=Content-Type:MIME-Version:Subject:Message-ID:To:From:Date; bh=7gVZYfDsOMjlcUpmDORXPROqMHH6q1blY32uknLuWBA=; b=BC2xnGIJqQqnSOLAo5Z6og4zMSJbntoT+3epoyDyb2m5r9xhP9afDhA0wYhbK3S0oYTialLD6GjlIV3SnY7Fq67au9sNVqswrtfWLDs39w2CBk9h0Ld0wOEeacthhLTJE8Y93DqCw9i+jFJJ1QJr0huVTltm3CH8rZzutuKmKZE=; Received: from [10.0.1.10] (helo=tc7-visena.wh.internal.visena.com) by post.visena.com with esmtp (Exim 4.82) (envelope-from ) id 1ag7JC-0001qC-BC for pgsql-performance@postgresql.org; Wed, 16 Mar 2016 10:00:04 +0100 Received: from localhost ([127.0.0.1] helo=tc7-visena.wh.internal.visena.com) by tc7-visena.wh.internal.visena.com with esmtp (Exim 4.82) (envelope-from ) id 1ag7JC-0003Os-8c for pgsql-performance@postgresql.org; Wed, 16 Mar 2016 10:00:02 +0100 Date: Wed, 16 Mar 2016 10:00:02 +0100 (CET) From: Andreas Joseph Krogh To: pgsql-performance Message-ID: Subject: Searching GIN-index (FTS) and sort by timestamp-column MIME-Version: 1.0 X-Mailer: Visena Mail 2.0.1-SNAPSHOT X-Spam-Score: -1.0 X-Spam-Report: SpamAssasin (score=-1.0, required 5.0 ALL_TRUSTED=-1,HTML_MESSAGE=0.001) X-Pg-Spam-Score: -2.0 (--) Content-Type: multipart/related; boundary="----=_Part_306_1904404269.1458118802191" List-Archive: List-Help: List-ID: List-Owner: List-Post: List-Subscribe: List-Unsubscribe: X-Mailing-List: pgsql-performance Precedence: bulk Sender: pgsql-performance-owner@postgresql.org ------=_Part_305_947943739.1458118802191 Content-Type: multipart/related; boundary="----=_Part_306_1904404269.1458118802191" ------=_Part_306_1904404269.1458118802191 Content-Type: multipart/alternative; boundary="----=_Part_307_983149005.1458118802213" ------=_Part_307_983149005.1458118802213 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable Hi all. =C2=A0 I'm doing full-text-search and want do display the results in the order the= =20 articles were received (timestamp). I have millions of articles where the= =20 newest are the most interesting, and a search may match many articles so do= ing=20 the sort using some INDEX would be great. =C2=A0 Take the following example-schema: =C2=A0 create extension if not exists btree_gin;=20 drop table if EXISTS delivery; create table delivery( id BIGSERIAL primary = key , fts_allTSVECTOR not null, folder_id BIGINT NOT NULL, received_timestamp= =20 TIMESTAMP not null, message varchar not null ); create index fts_idx ON del= ivery using gin(fts_all, folder_id); CREATE OR REPLACE FUNCTION=20 update_delivery_tsvector_tf()RETURNS TRIGGER AS $$ BEGIN NEW.fts_all =3D= =20 to_tsvector('simple', NEW.message); return NEW; END; $$ LANGUAGE PLPGSQL;= =20 CREATE TRIGGERupdate_delivery_tsvector_t BEFORE INSERT OR UPDATE ON deliver= y=20 FOR EACH ROW EXECUTE PROCEDUREupdate_delivery_tsvector_tf(); insert into=20 delivery(folder_id, received_timestamp,message) values (1, '2015-01-01', 'Y= es=20 hit four') , (1, '2014-01-01', 'Hi man') , (2, '2013-01-01', 'Hi man') , (2= ,=20 '2013-01-01', 'fish') ; analyze delivery; set ENABLE_SEQSCAN to off; explai= n=20 analyze SELECTdel.id , del.received_timestamp FROM delivery del WHERE 1 =3D= 1 AND=20 del.fts_all @@ to_tsquery('simple', 'hi:*') AND del.folder_id =3D 1 ORDER B= Y=20 del.received_timestampDESC LIMIT 101 OFFSET 0;=20 =C2=A0 I use btree_gin extention to make folder_id part of index. =C2=A0 I get the following plan (using 9.6 from master): =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 QUERY=20 PLAN=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 =C2=A0 =20 =E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2= =94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94= =80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80= =E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2= =94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94= =80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80= =E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2= =94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94= =80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80= =E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2= =94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94= =80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80= =E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2= =94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94= =80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80 =C2=A0Limit=C2=A0 (cost=3D5.23..5.23 rows=3D1 width=3D16) (actual time=3D0= .042..0.043 rows=3D2=20 loops=3D1) =C2=A0=C2=A0 ->=C2=A0 Sort=C2=A0 (cost=3D5.23..5.23 rows=3D1 width=3D16) (= actual time=3D0.040..0.040=20 rows=3D2 loops=3D1) =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 Sort Key: received_timest= amp DESC =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 Sort Method: quicksort=C2= =A0 Memory: 25kB =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 ->=C2=A0 Bitmap Heap Scan= on delivery del=C2=A0 (cost=3D3.90..5.22 rows=3D1=20 width=3D16) (actual time=3D0.029..0.030 rows=3D2 loops=3D1) =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0 Recheck Cond: (fts_all @@ '''hi'':*'::tsquery) =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0 Filter: (folder_id =3D 1) =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0 Rows Removed by Filter: 1 =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0 Heap Blocks: exact=3D1 =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0 ->=C2=A0 Bitmap Index Scan on fts_idx=C2=A0 (cost=3D0.00..3.90= rows=3D1=20 width=3D0) (actual time=3D0.018..0.018 rows=3D3 loops=3D1) =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 Index Cond: (fts_all @@ ''= 'hi'':*'::tsquery) =C2=A0Planning time: 0.207 ms =C2=A0Execution time: 0.085 ms (13 rows) =C2=A0 Here is the explain from a real-world query: =C2=A0 EXPLAIN ANALYZE SELECT del.entity_id , del.received_timestamp FROM= =20 origo_email_delivery delWHERE 1 =3D 1 AND del.fts_all @@ to_tsquery('simple= ',=20 'andre:*') AND del.folder_id =3D 44964 ORDER BY del.received_timestamp DESC= LIMIT=20 101OFFSET 0;=20 =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 QUERY=20 PLAN=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 =C2=A0 =20 =E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2= =94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94= =80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80= =E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2= =94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94= =80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80= =E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2= =94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94= =80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80= =E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2= =94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94= =80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80= =E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2= =94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94= =80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80= =E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2= =94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94= =80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80= =E2=94=80=E2=94=80=E2=94=80=E2=94=80 =C2=A0Limit=C2=A0 (cost=3D92260.66..92260.91 rows=3D101 width=3D16) (actua= l=20 time=3D347.891..347.907 rows=3D101 loops=3D1) =C2=A0=C2=A0 ->=C2=A0 Sort=C2=A0 (cost=3D92260.66..92291.08 rows=3D12167 w= idth=3D16) (actual=20 time=3D347.888..347.899 rows=3D101 loops=3D1) =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 Sort Key: received_timest= amp DESC =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 Sort Method: top-N heapso= rt=C2=A0 Memory: 29kB =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 ->=C2=A0 Bitmap Heap Scan= on origo_email_delivery del=C2=A0=20 (cost=3D2480.95..91794.77 rows=3D12167 width=3D16) (actual time=3D152.568..= 346.132=20 rows=3D18257 loops=3D1) =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0 Recheck Cond: (fts_all @@ '''andre'':*'::tsquery) =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0 Filter: (folder_id =3D 44964) =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0 Rows Removed by Filter: 264256 =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0 Heap Blocks: exact=3D80871 =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0 ->=C2=A0 Bitmap Index Scan on temp_fts_idx=C2=A0 (cost=3D0.00.= .2477.91=20 rows=3D309588 width=3D0) (actual time=3D134.903..134.903 rows=3D282513 loop= s=3D1) =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 Index Cond: (fts_all @@ ''= 'andre'':*'::tsquery) =C2=A0Planning time: 0.530 ms =C2=A0Execution time: 347.967 ms (13 rows) =C2=A0 =C2=A0 1. Why isnt' folder_id part of the index-cond? 2. Is there a way to make it use the (same) index to sort by=20 received_timestamp? 3. Using a GIN-index, is there a way to use the index at all for sorting? 4. It doesn't seem like ts_rank uses the index for sorting either. =C2=A0 Thanks. =C2=A0 -- Andreas Joseph Krogh CTO / Partner - Visena AS Mobile: +47 909 56 963 andreas@visena.com www.visena.com ------=_Part_307_983149005.1458118802213 Content-Type: text/html;charset=UTF-8 Content-Transfer-Encoding: quoted-printable
Hi all.
=C2=A0
I'm doing full-text-search and want do display the results in the orde= r the articles were received (timestamp). I have millions of articles where= the newest are the most interesting, and a search may match many articles = so doing the sort using some INDEX would be great.
=C2=A0
Take the following example-schema:
=C2=A0
create extension if not exists btree_gin;

drop table if EXISTS delivery;
create table delivery(
    id BIGSERIAL =
primary key,
    fts_all TSVEC=
TOR not null,
    folder_id BIG=
INT NOT NULL,
    received_timestamp TIMESTAMP not null,
    message varch=
ar not null
);
create index fts_idx ON delivery usin=
g gin(fts_all, folder_id);

CREATE OR REPLACE=
 FUNCTION update_delivery_tsvector_tf() RETURNS TRIGGER AS $$
BEGIN
    NEW.ft=
s_all =3D to_tsvector('simple', NEW.message);
    return=
 NEW;
END;
$$ =
LANGUAGE P=
LPGSQL;

CREATE TRIGGER update_delivery_tsvector_t BEFORE INSERT OR UPDATE ON delivery
FOR EACH ROW EXEC=
UTE PROCEDURE update_delivery_tsvector_tf();

insert into delivery(folder_id, received_timestamp, message)
values (1, '2015-01-01', 'Yes hit four')
    , (1, '2014-01-01', 'Hi man')
    , (2, '2013-01-01', 'Hi man')
    , (2, '2013-01-01', 'fish')
;

analyze de=
livery;

set ENABLE=
_SEQSCAN to off;

explain analyze S=
ELECT del.id
    , del.received_timestamp
FROM deliv=
ery del
WHERE 1 =3D 1
      AND del.fts_all @@ to_tsqu=
ery('simple', 'hi:*'=
)
      AND =
del.folder_id =3D 1
ORDER BY  =
del.received_timestamp DESC LIMIT 101 <=
/span>OFFSET 0;
=C2=A0
I use btree_gin extention to make folder_id part of index.
=C2=A0
I get the following plan (using 9.6 from master):
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 QUERY PLAN=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0 =C2=A0
=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2= =94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94= =80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80= =E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2= =94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94= =80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80= =E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2= =94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94= =80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80= =E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2= =94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94= =80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80= =E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2= =94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94= =80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80
=C2=A0Limit=C2=A0 (cost=3D5.23..5.23 rows=3D1 width=3D16) (actual time=3D0.= 042..0.043 rows=3D2 loops=3D1)
=C2=A0=C2=A0 ->=C2=A0 Sort=C2=A0 (cost=3D5.23..5.23 rows=3D1 width=3D16)= (actual time=3D0.040..0.040 rows=3D2 loops=3D1)
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 Sort Key: received_timesta= mp DESC
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 Sort Method: quicksort=C2= =A0 Memory: 25kB
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 ->=C2=A0 Bitmap Heap Sc= an on delivery del=C2=A0 (cost=3D3.90..5.22 rows=3D1 width=3D16) (actual ti= me=3D0.029..0.030 rows=3D2 loops=3D1)
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0 Recheck Cond: (fts_all @@ '''hi'':*'::tsquery)
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0 Filter: (folder_id =3D 1)
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0 Rows Removed by Filter: 1
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0 Heap Blocks: exact=3D1
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0 ->=C2=A0 Bitmap Index Scan on fts_idx=C2=A0 (cost=3D0.00..3.90= rows=3D1 width=3D0) (actual time=3D0.018..0.018 rows=3D3 loops=3D1)
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 Index Cond: (fts_all @@ '''hi= '':*'::tsquery)
=C2=A0Planning time: 0.207 ms
=C2=A0Execution time: 0.085 ms
(13 rows)
=C2=A0
Here is the explain from a real-world query:
=C2=A0 
EXPLAIN ANALYZE SELECT del.entity_id
    , del.received_timestamp
FROM origo=
_email_delivery del
WHERE 1 =3D 1
      AND del.fts_all @@ to_tsqu=
ery('simple', 'andre:*')
      AND =
del.folder_id =3D 44964
ORDER BY <=
/span>del.received_timestamp DESC LIMIT 101 OFFSET 0;
=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 QUERY PLAN=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0 =C2=A0
=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2= =94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94= =80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80= =E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2= =94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94= =80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80= =E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2= =94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94= =80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80= =E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2= =94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94= =80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80= =E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2= =94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94= =80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80= =E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2= =94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94= =80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80= =E2=94=80=E2=94=80=E2=94=80=E2=94=80
=C2=A0Limit=C2=A0 (cost=3D92260.66..92260.91 rows=3D101 width=3D16) (actual= time=3D347.891..347.907 rows=3D101 loops=3D1)
=C2=A0=C2=A0 ->=C2=A0 Sort=C2=A0 (cost=3D92260.66..92291.08 rows=3D12167= width=3D16) (actual time=3D347.888..347.899 rows=3D101 loops=3D1)
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 Sort Key: received_timesta= mp DESC
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 Sort Method: top-N heapsor= t=C2=A0 Memory: 29kB
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 ->=C2=A0 Bitmap Heap Sc= an on origo_email_delivery del=C2=A0 (cost=3D2480.95..91794.77 rows=3D12167= width=3D16) (actual time=3D152.568..346.132 rows=3D18257 loops=3D1)
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0 Recheck Cond: (fts_all @@ '''andre'':*'::tsquery)
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0 Filter: (folder_id =3D 44964)
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0 Rows Removed by Filter: 264256
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0 Heap Blocks: exact=3D80871
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0 ->=C2=A0 Bitmap Index Scan on temp_fts_idx=C2=A0 (cost=3D0.00.= .2477.91 rows=3D309588 width=3D0) (actual time=3D134.903..134.903 rows=3D28= 2513 loops=3D1)
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 Index Cond: (fts_all @@ '''an= dre'':*'::tsquery)
=C2=A0Planning time: 0.530 ms
=C2=A0Execution time: 347.967 ms
(13 rows)
=C2=A0
=C2=A0
1. Why isnt' folder_id part of the index-cond?
2. Is there a way to make it use the (same) index to sort by received_= timestamp?
3. Using a GIN-index, is there a way to use the index at all for sorti= ng?
4. It doesn't seem like ts_rank uses the index for sorting either.
=C2=A0
Thanks.
=C2=A0
--
Andrea= s Joseph Krogh
CTO / Partner<= /span> - Visena AS
Mobile: +47 90= 9 56 963
=3D""
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