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https://issues.apache.org/jira/browse/PARQUET-2006?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17510289#comment-17510289
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ASF GitHub Bot commented on PARQUET-2006:
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ggershinsky commented on pull request #950:
URL: https://github.com/apache/parquet-mr/pull/950#issuecomment-1074835875
Thanks @huaxingao , one more question / clarification. In the writer,
> field_id has to be unique in the entire schema, otherwise, an Exception
will be thrown.
what happens if the column ids are not set by the caller?
In the reader,
> the id in the requested schema will be used to figured out the original
ColumnPath.
what happens if the file footer doesn't have the column ids (field_id were
not set by the writer)?
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> Column resolution by ID
> -----------------------
>
> Key: PARQUET-2006
> URL: https://issues.apache.org/jira/browse/PARQUET-2006
> Project: Parquet
> Issue Type: New Feature
> Components: parquet-mr
> Reporter: Xinli Shang
> Assignee: Xinli Shang
> Priority: Major
>
> Parquet relies on the name. In a lot of usages e.g. schema resolution, this
> would be a problem. Iceberg uses ID and stored Id/name mappings.
> This Jira is to add column ID resolution support.
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