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From: Tom Lane <tgl@sss.pgh.pa.us>
To: gzh <gzhcoder@126.com>
cc: pgsql-general@lists.postgresql.org
Subject: Re: ERROR: stack depth limit exceeded
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gzh <gzhcoder@126.com> writes:
> I upgraded the version of PostgreSQL from 12.13 to 12.16. =

> If multiple subqueries or a large number of UNION ALL were used, =

> the previously unseen error message "ERROR: stack depth limit exceeded" =
will appear after upgrading the version.

Please provide a self-contained example.  The people who might be
able to fix this are too busy to guess about what you are seeing.

			regards, tom lane