Horton

Re: "variable not found in subplan target list"

Tom Lane <tgl@sss.pgh.pa.us>

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From: Tom Lane <tgl@sss.pgh.pa.us>
To: Alvaro Herrera <alvherre@alvh.no-ip.org>
Cc: Pg Hackers <pgsql-hackers@lists.postgresql.org>
Date: 2023-03-28T14:46:29Z
Lists: pgsql-hackers

Attachments

I wrote:
> The planner is reducing the scan of target_parted to
> a dummy scan, as is reasonable, but it forgets to
> provide ctid as an output from that scan; then the
> parent join node is unhappy because it does have
> a ctid output.  So it looks like the problem is some
> shortcut we take while creating the dummy scan.

Oh, actually the problem is in distribute_row_identity_vars,
which is supposed to handle this case, but it thinks it doesn't
have to back-fill the rel's reltarget.  Wrong.  Now that I see
the problem, I wonder if we can't reproduce a similar symptom
without MERGE, which would mean that v14 has the issue too.

The attached seems to fix it, but I'm going to look for a
non-MERGE test case before pushing.

			regards, tom lane

Commits

  1. Revert "Move PartitionPruneInfo out of plan nodes into PlannedStmt"

  2. Fix setrefs.c code for adjusting partPruneInfos

  3. Fix corner-case planner failure for MERGE.