[teiid-issues] [JBoss JIRA] (TEIID-3756) Order By clause specified in STRING_AGG function is skipped when pushed down to PostgreSQL

[Salvatore R (JIRA)]

Salvatore R created TEIID-3756:
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             Summary: 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
            Reporter: Salvatore R
            Assignee: Steven Hawkins


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.



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