Horton

Fix NULL pointer reference in _outPathTarget()

Richard Guo <guofenglinux@gmail.com>

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From: Richard Guo <guofenglinux@gmail.com>
To: PostgreSQL-development <pgsql-hackers@postgresql.org>
Date: 2022-04-18T07:35:53Z
Lists: pgsql-hackers

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The array sortgrouprefs[] inside PathTarget might be NULL if we have not
identified sort/group columns in this tlist. In that case we would have
a NULL pointer reference in _outPathTarget() when trying to print
sortgrouprefs[] with WRITE_INDEX_ARRAY as we are using the length of
PathTarget->exprs as its array length.

Attached is a fix that can address this problem.

Thanks
Richard

Commits

  1. Handle NULL fields in WRITE_INDEX_ARRAY