HIVE-29368: More accurate pessimistic stats combining#6359

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konstantinb wants to merge 14 commits intoapache:masterfrom

konstantinb:HIVE-29368-pessimistic

Commits on Mar 13, 2026

HIVE-29368: Could this be the truly accurate pessimistic stats combining?
konstantinb
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Commits on Mar 20, 2026

Commits on Mar 21, 2026

Commits on Mar 24, 2026

HIVE-29368: configured split file counts consistently between CI & localhost
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Commits on Mar 25, 2026

Commits on Mar 26, 2026

HIVE-29368: buildColStatForConstant() can be simplified after removing NDV logic
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Commits on Mar 27, 2026

Commits on Mar 30, 2026

HIVE-29368: tweaking extractNDVGroupingColumns conditions, test code fixes, new .out files
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