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41ed749e48
Applying pg_freespacemap() to a relation lacking storage (such as a view) caused an assertion failure, although there was no ill effect in non-assert builds. Add an error check for that case. Bug: #18866 Reported-by: Robins Tharakan <tharakan@gmail.com> Author: Tender Wang <tndrwang@gmail.com> Reviewed-by: Euler Taveira <euler@eulerto.com> Discussion: https://postgr.es/m/18866-d68926d0f1c72d44@postgresql.org Backpatch-through: 13