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One approach that @rcaudy suggested in the meanwhile:
If you have a raw source table in groovy, you should be able to:
.initialize() it
Get its columnSourceManager field.
Get the Table result of the CSM’s locationTable()
Get the K-V metadata for each file by applying an update("KV = ((io.deephaven.parquet.table.location.ParquetTableLocation) _TableLocation).getParquetKey().getMetadata().getFileMetaData().getKeyValueMetaData()")
This will help with remotely debugging and understanding the parquet file structure.
We can follow the similar API spec as duck_db: https://duckdb.org/docs/data/parquet/overview
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