[port of #25917 to Altinity/21.3] Using required columns for block size prediction #99
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…ocksizeprediction Using required columns for block size prediction
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Port of ClickHouse#25917:
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Changelog entry (a user-readable short description of the changes that goes to CHANGELOG.md):
Improved memory usage with better block size prediction when reading empty DEFAULT columns. Closes ClickHouse#17317.