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Tom Lane authored
parallel --- and, not incidentally, removing a common reason for needing manual cleanup by the DB admin after a crash. Remove initial global delete of pg_statistics rows in VACUUM ANALYZE; this was not only bad for performance of other backends that had to run without stats for a while, but it was fundamentally broken because it was done outside any transaction. Surprising we didn't see more consequences of that. Detect attempt to run VACUUM inside a transaction block. Check for query cancel request before starting vacuum of each table. Clean up vacuum's private portal storage if vacuum is aborted.
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