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https://issues.apache.org/jira/browse/FLINK-29527?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17630132#comment-17630132
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Sun Shun commented on FLINK-29527:
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[~lirui] could you please help take a look at this PR when you are free, thanks
> Make unknownFieldsIndices work for single ParquetReader
> -------------------------------------------------------
>
> Key: FLINK-29527
> URL: https://issues.apache.org/jira/browse/FLINK-29527
> Project: Flink
> Issue Type: Bug
> Components: Formats (JSON, Avro, Parquet, ORC, SequenceFile)
> Affects Versions: 1.16.0
> Reporter: Sun Shun
> Assignee: Sun Shun
> Priority: Major
> Labels: pull-request-available
>
> Currently, from the improvement FLINK-23715, Flink use a collection named
> `unknownFieldsIndices` to track the nonexistent fields, and it is kept inside
> the `ParquetVectorizedInputFormat`, and applied to all parquet files under
> given path.
> However, some fields may only be nonexistent in some of the historical
> parquet files, while exist in latest ones. And based on
> `unknownFieldsIndices`, flink will always skip these fields, even thought
> they are existing in the later parquets.
> As a result, the value of these fields will become empty when they are
> nonexistent in some historical parquet files.
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