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https://issues.apache.org/jira/browse/PARQUET-1464?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16699464#comment-16699464
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ASF GitHub Bot commented on PARQUET-1464:
-----------------------------------------
moulimukherjee opened a new pull request #558: [WIP] PARQUET-1464: Allowing
backwards compatible projections
URL: https://github.com/apache/parquet-mr/pull/558
This PR addresses two scenarios, which currently fails.
1. Adding an optional field to an existing thrift schema and making it part
of the projection for reading data written using older thrift.
2. Projecting a required field using optional.
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> Not able to do backwards compatible projection
> ----------------------------------------------
>
> Key: PARQUET-1464
> URL: https://issues.apache.org/jira/browse/PARQUET-1464
> Project: Parquet
> Issue Type: Bug
> Components: parquet-mr
> Reporter: Mouli Mukherjee
> Priority: Major
> Labels: pull-request-available
>
> Currently the following scenarios fail while using projections. This makes it
> hard to do backwards compatible schema changes like adding an optional field
> or making a required field optional.
> 1. Adding an optional field to an existing thrift schema and making it part
> of the projection for reading data written using older thrift.
> 2. Projecting a required field using optional.
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