pjmore opened a new pull request #2000:
URL: https://github.com/apache/arrow-datafusion/pull/2000
# Which issue does this PR close?
Partially closes #1999.
# Rationale for this change
Fix behaviour when querying only partitioning columns for parquet file
format.
# What changes are included in this PR?
<!--
There is no need to duplicate the description in the issue here but it is
sometimes worth providing a summary of the individual changes in this PR.
-->
Use row group level metadata to return the correct number of partition
columns.
# Are there any user-facing changes?
<!--
If there are user-facing changes then we may require documentation to be
updated before approving the PR.
-->
No
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