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Prevent assertion failure in contrib/pg_freespacemap.

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

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Commit: db8238da4265a1e381c0b5499cac2518580bb463
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2025-03-27T17:20:23Z
Releases: 13.21 
Prevent assertion failure in contrib/pg_freespacemap.

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

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PathChange+/−
contrib/pg_freespacemap/pg_freespacemap.c modified +7 −0

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