| From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
|---|---|
| To: | sean(dot)johnston(at)edgeintelligence(dot)com |
| Cc: | pgsql-bugs(at)postgresql(dot)org, Robert Haas <robertmhaas(at)gmail(dot)com>, Jeevan Chalke <jeevan(dot)chalke(at)enterprisedb(dot)com>, Ashutosh Bapat <ashutosh(dot)bapat(at)enterprisedb(dot)com> |
| Subject: | Re: BUG #14890: Error grouping by same column twice using FDW |
| Date: | 2017-11-07 22:29:41 |
| Message-ID: | 10660.1510093781@sss.pgh.pa.us |
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| Lists: | pgsql-bugs |
sean(dot)johnston(at)edgeintelligence(dot)com writes:
> select col1, col1 from loop_tbl group by 1, 2;
> psql:t.sql:7: ERROR: targetlist item has multiple sortgroupref labels
This is the fault of commit 7012b132d ("Push down aggregates to remote
servers"), which imagined that postgres_fdw can use
apply_pathtarget_labeling_to_tlist() for situations well beyond that
function's limited abilities. I kinda suspect that foreign_grouping_ok()
has got more bugs than this with complicated sortgroupref situations, too;
its willingness to scribble on the sortgrouprefs doesn't look like a great
idea to me.
regards, tom lane
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