Fix MERGE16_FIXME: cleanup AO vacuum, PartitionSelector, and qual pushdown#1820

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lss602726449:fix-merge16-fixmes

Commits on Jun 22, 2026

Remove unnecessary vacuum_set_xid_limits calls for AO/AOCO tables
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Remove MERGE16_FIXME in PartitionSelector and dead declarations
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Fix MERGE16_FIXME: add UNSAFE_HAS_SUBPLAN flag for qual pushdown
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Fix PAX alter_distribution_policy test: use matchsubs to mask cluster.c line number
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Re-enable pgstat temp file reporting and fix SIGSEGV in ReportTemporaryFileUsage
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Remove MERGE16_FIXME: delete dead requiredPerms stripping code in exec_mpp_query
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Remove MERGE16_FIXME comment in extract_directory
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Fix singlenode prevent_ao_wal test: enable pg_waldump and fix expected output
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Re-enable select_throttle and workfile_mgr_test in singlenode
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Fix flaky resgroup_cpu_max_percent: average all CPU samples
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Commits on Jun 23, 2026