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https://issues.apache.org/jira/browse/PARQUET-2006?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17509652#comment-17509652
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ASF GitHub Bot commented on PARQUET-2006:
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ggershinsky edited a comment on pull request #950:
URL: https://github.com/apache/parquet-mr/pull/950#issuecomment-1073553770
hi @huaxingao , can you describe the lifecycle of the column IDs at a high
level, either in the PR description, or in a comment? Where these IDs are
stored (if in footer - which struct/field)? How are they set and written? Is
the writer app expected to verify the uniqueness, or it can use this PR code
for that? How the column IDs are read and used (is the reader app expected to
do anything beyond using this PR code)?
I think the answer to the last question is mostly provided, but it doesn't
explicitly say what IDs are used (where they are stored / read from).
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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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