vvysotskyi opened a new pull request #1985: DRILL-7565: ANALYZE TABLE ... REFRESH METADATA does not work for empty Parquet files URL: https://github.com/apache/drill/pull/1985 # [DRILL-7565](https://issues.apache.org/jira/browse/DRILL-7565): ANALYZE TABLE ... REFRESH METADATA does not work for empty Parquet files ## Description - Fixed `ConvertMetadataAggregateToDirectScanRule` rule to distinguish array columns correctly and proceed using other parquet metadata if such columns are found. - Added new implicit column which signalizes whether the empty result is obtained during collecting metadata and helps to distinguish real data results from metadata results. - Updated scan to return row with metadata if the above implicit column is present. - Added unit tests for checking the correctness of both optional and required columns from empty files. ## Documentation NA ## Testing Added unit tests.
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