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https://issues.apache.org/jira/browse/PARQUET-1652?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Wes McKinney closed PARQUET-1652.
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Assignee: (was: Wes McKinney)
> [C++] ColumnWriter writes incorrect "num_values" metadata for nested types
> --------------------------------------------------------------------------
>
> Key: PARQUET-1652
> URL: https://issues.apache.org/jira/browse/PARQUET-1652
> Project: Parquet
> Issue Type: Bug
> Components: parquet-cpp
> Reporter: Wes McKinney
> Priority: Major
>
> While investigating ARROW-5630, I discovered that we are writing incorrect
> "num_values" metadata in {{DataPageHeader}} when writing nested types.
> Instead of writing "Number of values, including NULLs, in this data page" as
> the specification in parquet.thrift says, we are writing the number of
> definition levels. For flat types, the number of definition levels and number
> of values with nulls in the same, but for nested types the number of values
> with nulls will generally be smaller.
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