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https://issues.apache.org/jira/browse/PARQUET-1809?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17051585#comment-17051585
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Ryan Blue commented on PARQUET-1809:
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I think it should be fine to allow this. While there may be other problems when
using `.` in names, the Spark PR that uses this shows that it works just fine
to pass a string array instead of parsing a name.
> Add new APIs for nested predicate pushdown
> -------------------------------------------
>
> Key: PARQUET-1809
> URL: https://issues.apache.org/jira/browse/PARQUET-1809
> Project: Parquet
> Issue Type: New Feature
> Components: parquet-mr
> Reporter: DB Tsai
> Priority: Major
>
> Currently, Parquet's *org.apache.parquet.filter2.predicate.FilterApi* is
> using *dot* to split the column name into multi-parts of nested fields. The
> drawback is that this causes issues when the field name contains *dot*.
> The new APIs that will be added will take array of string directly for
> multi-parts of nested fields, so no confusion as using *dot* as a separator.
> See https://github.com/apache/spark/pull/27728 and [SPARK-17636] for details.
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