HIVE-29556: do not adjust "unknown" NDVs in extractNDVGroupingColumns#6418

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Commits on Apr 30, 2026

HIVE-29556: do not adjust "unknown" NDVs in extractNDVGroupingColumns
konstantinb
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HIVE-29556: can't elegantly resolve "const NULL" columns without a new flag (or bigger refactoring)
konstantinb
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Commits on May 1, 2026

HIVE-29556: one more file's plan has been positively impacted, plus one more "const" condition missed earlier
konstantinb
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