Horton

Re: BUG #18077: PostgreSQL server subprocess crashed by a SELECT statement with WITH clause

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

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From: Tom Lane <tgl@sss.pgh.pa.us>
To: Richard Guo <guofenglinux@gmail.com>
Cc: fuboat@outlook.com, pgsql-bugs@lists.postgresql.org
Date: 2023-09-05T02:04:33Z
Lists: pgsql-bugs 
Richard Guo <guofenglinux@gmail.com> writes:
> BTW, do you think get_name_for_var_field() has similar problem for
> RTE_SUBQUERY case?  The RTE_CTE code path in that function crawls up the
> namespace stack before recursing into the CTE while the RTE_SUBQUERY
> code patch does not, which looks like an oversight.

Hmm, seems suspicious ...

> I tried to find a
> test case to show it's indeed a problem but with no luck.

Note that any test case here would be of the form "dump a view
or rule definition", not "EXPLAIN".  What did you try?

			regards, tom lane

Commits

  1. Track nesting depth correctly when drilling down into RECORD Vars.

  2. Fix get_expr_result_type() to find field names for RECORD Consts.

  3. Allow extracting fields from a ROW() expression in more cases.