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[ntuple] Properly set bit width/value range when generating column elements from on disk info - #23755
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Test Results 23 files 23 suites 3d 22h 18m 31s ⏱️ Results for commit 2f77729. ♻️ This comment has been updated with latest results. |
jblomer
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Oct 19, 2026
The column type alone is insufficient to create a proper ColumnElement when the element type is one that carries additional info, such as Real32Trunc/Quant. When creating such types one must also set the BitsOnStorage and ValueRange appropriately. To prevent mistakes due to callers forgetting to do so, we force them to pass the complete column descriptor when generating a column element using the <void> overload.
Apply the source column's stored bit width before computing packed page sizes during recompression. This allows truncated and quantized float pages to be merged with a different output compression. Compare both fields against their stored source values in a regression. Assisted-by: codex:gpt-6.1-sol Assisted-by: claude-code:opus
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This Pull request:
changes the signature of
RColumnElementBase::Generate<void>to pass the entire column descriptor (rather than just the column type) so that the function can properly set the extra column information for types that need it (Real32Trunc/Quant).Also adds an overload for
GenerateColumnElementthat does the same.This fixes a bug in the Merger (reported in #23752, which this PR builds upon/includes) and hopefully prevents similar bugs to appear in the future.
The merger test provided by @Elvand-Lie is included in this PR.
Checklist: