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https://issues.apache.org/jira/browse/ORC-1058?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17463401#comment-17463401
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Dongjoon Hyun commented on ORC-1058:
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Thank you for filing a JIRA, [~melin].
> Add metadata num_nulls
> ----------------------
>
> Key: ORC-1058
> URL: https://issues.apache.org/jira/browse/ORC-1058
> Project: ORC
> Issue Type: Improvement
> Reporter: melin
> Priority: Major
>
> parquet store the amount of null data for each column, which can be read
> directly during data quality analysis, avoiding calculation of statistics
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