add_files support partitioned tables
#531
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Fokko
reviewed
Mar 19, 2024
Fokko
reviewed
Mar 19, 2024
Thank you very much for the detailed review @Fokko . I've adopted all of your review comments 👍 - I would appreciate another round of review! |
Fokko
approved these changes
Mar 21, 2024
Thank you! As always! @Fokko |
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As a follow up to #506, this PR introduces the support for adding files as DataFiles to partitioned tables.
Instead of relying on the more inaccurate method of parsing and inferring partition values from the file path relying on a Hive partitioning scheme, this approach requires that the partition values are there in the parquet files, and infers the partition values from the partition metadata footer by taking using the lower and upper bound values.
The optimization to use the lower bound and upper bound values prevents the client from having to read the entire parquet file as it is able to use the aggregated statistics from the parquet metadata footer. As a result, this implementation of add_files does not support tables with partition transforms that are non-linear (not
preserves_order).Among the existing Transforms, the following Transform partitions are supported:
The following are not: