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https://issues.apache.org/jira/browse/PARQUET-1464?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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ASF GitHub Bot updated PARQUET-1464:
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Labels: pull-request-available (was: )
> 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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