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https://issues.apache.org/jira/browse/PARQUET-2305?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17728742#comment-17728742
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ASF GitHub Bot commented on PARQUET-2305:
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tddfan opened a new pull request, #1102:
URL: https://github.com/apache/parquet-mr/pull/1102
If Parquet has any field which has been removed from the schema and Parquet
to Proto conversion happens, it errors out due to Unknown fields. There could
be some scenarios that we want to still convert PARQUET into the target proto
schema object which has lesser fields. In this change using the
ProtoParquetReader and specifying "ignoreUnknownFields" as an argument, the
conversion can still be done which would ignore fields it can't convert and not
error out.
Similar functionality exist in
https://github.com/protocolbuffers/protobuf/blob/main/java/util/src/main/java/com/google/protobuf/util/JsonFormat.java
with field "ignoringUnknownFields"
Make sure you have checked all steps below.
Tests
[ SS] My PR adds more cases to the unit test ProtoSchemaConverterTest to
cover for ignoreUnknownFields:
> Allow Parquet to Proto conversion even though Target Schema has less fields
> ---------------------------------------------------------------------------
>
> Key: PARQUET-2305
> URL: https://issues.apache.org/jira/browse/PARQUET-2305
> Project: Parquet
> Issue Type: Improvement
> Components: parquet-protobuf
> Reporter: Sanjay Sharma
> Priority: Major
>
> If Parquet has any field which has been removed from the schema and Parquet
> to Proto conversion happens, it errors out due to Unknown fields. There could
> be some scenarios that we want to still convert PARQUET into the target proto
> schema object which has lesser fields.
> If specified "ignoreUnknownFields" as an argument, this should allow the
> conversion which ignore fields it can't convert and not error out.
> Similar functionality exist in
> [https://github.com/protocolbuffers/protobuf/blob/main/java/util/src/main/java/com/google/protobuf/util/JsonFormat.java]
> with field "ignoringUnknownFields"
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