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https://issues.apache.org/jira/browse/SPARK-37980?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17486654#comment-17486654
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Prakhar Jain commented on SPARK-37980:
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Thanks [~cloud_fan] [~lian cheng] for your input. Yes - this functionality
coming from upstream parquet-mr makes more sense and will prevent us from
re-implementing some stuff which parquet-mr already do (e.g. rowgroup filtering
etc).
I have opened PARQUET-2117 for row-position support from parquet-mr.
> Extend METADATA column to support row indices for file based data sources
> -------------------------------------------------------------------------
>
> Key: SPARK-37980
> URL: https://issues.apache.org/jira/browse/SPARK-37980
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 3.3
> Reporter: Prakhar Jain
> Priority: Major
>
> Spark recently added hidden metadata column support for File based
> datasources as part of SPARK-37273.
> We should extend it to support ROW_INDEX/ROW_POSITION also.
>
> Meaning of ROW_POSITION:
> ROW_INDEX/ROW_POSITION is basically an index of a row within a file. E.g. 5th
> row in the file will have ROW_INDEX 5.
>
> Use cases:
> Row Indexes can be used in a variety of ways. A (fileName, rowIndex) tuple
> uniquely identifies row in a table. This information can be used to mark rows
> e.g. this can be used by indexer etc.
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