GH-3574: parquet-hadoop: Statistics.toParquetStatistics: always set null_count#3575
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mdibaiee wants to merge 1 commit into
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GH-3574: parquet-hadoop: Statistics.toParquetStatistics: always set null_count#3575mdibaiee wants to merge 1 commit into
mdibaiee wants to merge 1 commit into
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wgtmac
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@wgtmac hey, thanks for the initial review. any chance of getting the workflows approved for running so the checks also run and we are closer to merging? If any help from our side can help expedite this please let us know, as we have customers blocked on this and are happy to help as much as possible. Appreciate your time 🙇🏽 |
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Rationale for this change
Missing
null_countstatistics for columns in parquet files can cause issues with downstream consumers of these files. It is not necessary to omit this statistic for columns which are larger than the truncation configuration, since despite the truncation, their nullability can be asserted with confidence. It is reasonable to keep omitting min/max statistics due to the rationale explained in the comment in the code.What changes are included in this PR?
Always add
null_countstatistics for columns in parquet files, unconditional of their size.Are these changes tested?
Yes,
TestParquetMetadataConverter.javahas been updated to reflect these changesAre there any user-facing changes?
I think we can consider the additional
null_countstatistic's appearance as a user-facing changeCloses #3574