feat: derive a distinct count from primary key and unique constraints - #24520

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Dandandan:feat/pk-cardinality-estimation

Commits on Aug 20, 2026

feat: derive a distinct count from primary key and unique constraints

Dandandan
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claude
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32d17cb
Store the derived distinct counts instead of deriving them on every read

Dandandan
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claude
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d723f9e
Honour the declared constraint: the derived count is as exact as the row count

Dandandan
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claude
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867aae3
feat: an equality on a unique column matches one row at most

Dandandan
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claude
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b3c76d3
Extend it to an IN list: one row per value asked for

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d16d257