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David Rowley 2310064510 Fix UNION planner datatype issue ... 66c0185a3 gave the planner the ability to have union child queries provide the union planner with pre-sorted input so that UNION queries could be more efficiently implemented using Merge Append. That commit overlooked checking that the UNION target list and the union child target list's types all match. In some corner cases, this could result in the planner producing sorts using the sort operator of the top-level UNION's target list type rather than of the union child's target list's type. The implications of this range from silently working correctly, despite using the wrong sort operator all the way up to a segmentation fault. Here we fix by adjusting the planner so it makes no attempt to have the subquery produce pre-sorted results when the data type of the UNION target list and the types from the subquery target list don't match exactly. Backpatch to 17, where 66c0185a3 was introduced. Reported-by: Jason Smith <dqetool@126.com> Diagnosed-by: Tom Lane <tgl@sss.pgh.pa.us> Bug: 18764 Discussion: https://postgr.es/m/18764-63ad667ea26e877a%40postgresql.org Backpatch-through: 17		12 months ago
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backend	Fix UNION planner datatype issue	12 months ago
bin	Fix off_t overflow in pg_basebackup on Windows.	12 months ago
common	Update copyright for 2025	1 year ago
fe_utils	flex code modernization: Replace YY_EXTRA_TYPE define with flex option	12 months ago
include	Merge pgstat_count_io_op_n() and pgstat_count_io_op()	12 months ago
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pl	Provide 64-bit ftruncate() and lseek() on Windows.	12 months ago
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template	thread-safety: gmtime_r(), localtime_r()	1 year ago
test	Fix an ALTER GROUP ... DROP USER error message.	12 months ago
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tools	Refactor some code related to backend statistics	12 months ago
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Makefile.global.in	Use <stdint.h> and <inttypes.h> for c.h integers.	1 year ago
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