Order By clause specified in STRING_AGG function is skipped when pushed down to PostgreSQL ------------------------------------------------------------------------------------------ Key: TEIID-3756 URL: https://issues.jboss.org/browse/TEIID-3756 Project: Teiid Issue Type: Bug Components: Query Engine Affects Versions: 8.4 Reporter: Salvatore R Assignee: Steven Hawkins Fix For: 8.12, 8.11.5 I defined a small table in PostgreSQL as follows: {code:sql} create table test_string_agg (col1 varchar(10)) insert into test_string_agg VALUES ('b'); insert into test_string_agg VALUES ('a'); insert into test_string_agg VALUES ('c'); {code} When I run a query with a STRING_AGG function where an ORDER BY clause is specified, the strings are not concatenated in the expected order. For example, these three queries: {code:sql} select string_agg(col1, ' , ' order by col1) from pg.test_string_agg; select string_agg(col1, ' , ' order by col1 desc) from pg.test_string_agg; select string_agg(col1, ' , ' order by col1 asc) from pg.test_string_agg; {code} return all the same result "b , a , c". It seems that the ORDER BY clause is not pushed down to PostgreSQL, in fact all the three rewritten queries executed in PostgreSQL look like: {code:sql} SELECT STRING_AGG(g_0."col1", ' , ') FROM "public"."test_string_agg" AS g_0 {code} If the STRING_AGG function is not pushed down (e.g. in MySQL), I get an expected result.