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f729fdab45
As coded, the function relied on index_open() when opening an index relation, allowing partitioned indexes to be processed by pgstathashindex(). This was leading to a "could not open file" error because partitioned indexes have no physical files, or to a crash with an assertion failure (like on HEAD). This issue is fixed by applying the same checks as the other stat functions for indexes, with a lookup at both RELKIND_INDEX and the index AM expected. Author: Alexander Lakhin Discussion: https://postgr.es/m/18246-f4d9ff7cb3af77e6@postgresql.org Backpatch-through: 12