I have attempted to convert pg_get_indexdef() to use systable_beginscan() based on transaction-snapshot rather than using SearchSysCache(). The latter does not have any old info and thus provides only the latest info as per the committed txns, which could result in errors in some scenarios. One such case is mentioned atop pg_dump.c. The patch is an attempt to fix the same pg_dump's issue. Any feedback is welcome.
There is a long list of pg_get_* functions which use SearchSysCache() and thus may expose similar issues. I can give it a try to review the possibility of converting all of them. Thoughts? thanks Shveta
v1-0001-pg_get_indexdef-modification-to-use-TxnSnapshot.patch
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