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https://issues.apache.org/jira/browse/SPARK-48964?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Yang Jie resolved SPARK-48964.
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Fix Version/s: 4.0.0
Resolution: Fixed
Issue resolved by pull request 47458
[https://github.com/apache/spark/pull/47458]
> Fix the discrepancy between implementation, comment and documentation of
> option recursive.fields.max.depth in ProtoBuf connector
> --------------------------------------------------------------------------------------------------------------------------------
>
> Key: SPARK-48964
> URL: https://issues.apache.org/jira/browse/SPARK-48964
> Project: Spark
> Issue Type: Documentation
> Components: Connect
> Affects Versions: 3.5.0, 4.0.0, 3.5.1, 3.5.2, 3.5.3
> Reporter: Yuchen Liu
> Priority: Major
> Labels: pull-request-available
> Fix For: 4.0.0
>
>
> After the three PRs ([https://github.com/apache/spark/pull/38922,]
> [https://github.com/apache/spark/pull/40011,]
> [https://github.com/apache/spark/pull/40141]) working on the same option,
> there are some legacy comments and documentation that has not been updated to
> the latest implementation. This task should consolidate them. Below is the
> correct description of the behavior.
> The `recursive.fields.max.depth` parameter can be specified in the
> from_protobuf options to control the maximum allowed recursion depth for a
> field. Setting `recursive.fields.max.depth` to 1 drops all-recursive fields,
> setting it to 2 allows it to be recursed once, and setting it to 3 allows it
> to be recursed twice. Attempting to set the `recursive.fields.max.depth` to a
> value greater than 10 is not allowed. If the `recursive.fields.max.depth` is
> specified to a value smaller than 1, recursive fields are not permitted. The
> default value of the option is -1. if a protobuf record has more depth for
> recursive fields than the allowed value, it will be truncated and some fields
> may be discarded. This check is based on the fully qualified field type. SQL
> Schema for the protobuf message
> {code:java}
> message Person { string name = 1; Person bff = 2 }{code}
> will vary based on the value of `recursive.fields.max.depth`.
> {code:java}
> 1: struct<name: string>
> 2: struct<name string, bff: <name: string>>
> 3: struct<name string, bff: <name: string, bff: struct<name: string>>> ...
> {code}
>
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