dev_ds=> explain select uri, date from ds.document where extra->>'id_cellar' like '487d4f99-f65b-11ea-991b-01aa75ed71a1';
                                             QUERY PLAN                                              
-----------------------------------------------------------------------------------------------------
 Bitmap Heap Scan on document  (cost=2530.38..183518.22 rows=50372 width=50)
   Recheck Cond: ((extra ->> 'id_cellar'::text) ~~ '487d4f99-f65b-11ea-991b-01aa75ed71a1'::text)
   ->  Bitmap Index Scan on ix_ds_document_id_cellar  (cost=0.00..2517.79 rows=50372 width=0)
         Index Cond: ((extra ->> 'id_cellar'::text) ~~ '487d4f99-f65b-11ea-991b-01aa75ed71a1'::text)
 JIT:
   Functions: 4
   Options: Inlining false, Optimization false, Expressions true, Deforming true
(7 rows)

dev_ds=> explain select uri, date from ds.document where extra->>'id_cellar' like '487d4f99-f65b-11ea-991b-01aa75ed71a1' limit 1;
                                           QUERY PLAN                                            
-------------------------------------------------------------------------------------------------
 Limit  (cost=0.00..61.28 rows=1 width=50)
   ->  Seq Scan on document  (cost=0.00..3086581.90 rows=50372 width=50)
         Filter: ((extra ->> 'id_cellar'::text) ~~ '487d4f99-f65b-11ea-991b-01aa75ed71a1'::text)
(3 rows)

dev_ds=> explain select uri, date from ds.document where extra->>'id_cellar' like '%487d4f99-f65b-11ea-991b-01aa75ed71a1' limit 1;
                                                 QUERY PLAN                                                 
------------------------------------------------------------------------------------------------------------
 Limit  (cost=2051.81..2055.77 rows=1 width=50)
   ->  Bitmap Heap Scan on document  (cost=2051.81..6038.96 rows=1007 width=50)
         Recheck Cond: ((extra ->> 'id_cellar'::text) ~~ '%487d4f99-f65b-11ea-991b-01aa75ed71a1'::text)
         ->  Bitmap Index Scan on ix_ds_document_id_cellar  (cost=0.00..2051.56 rows=1007 width=0)
               Index Cond: ((extra ->> 'id_cellar'::text) ~~ '%487d4f99-f65b-11ea-991b-01aa75ed71a1'::text)
(5 rows)

aegir=# create table toto(id integer);
CREATE TABLE
aegir=# insert into toto (select generate_series(1,1000));                                                                                  
INSERT 0 1000
aegir=# CREATE OR REPLACE FUNCTION test(text) RETURNS SETOF integer as $$
aegir$# begin return query execute( $1 ); end; $$
aegir-# LANGUAGE plpgsql;
CREATE FUNCTION
aegir=# select * from test('select id from toto limit 5');
 test 
------
    1
    2
    3
    4
    5
(5 rows)