Handle empty string correctly in Parquet statistics #14257
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@karthikeyann could you please check the changes to the predicate pushdown to make sure that's correct? |
vuule
approved these changes
Oct 6, 2023
Comment on lines
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| using optional_binary = parquet_field_optional<std::vector<uint8_t>, parquet_field_binary>; | ||
| using optional_int64 = parquet_field_optional<int64_t, parquet_field_int64>; | ||
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| auto op = std::make_tuple(optional_binary(1, s->max), | ||
| optional_binary(2, s->min), | ||
| optional_int64(3, s->null_count), | ||
| optional_int64(4, s->distinct_count), | ||
| optional_binary(5, s->max_value), | ||
| optional_binary(6, s->min_value)); |
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Beautiful, the investment into parquet_field_optional is paying off!
Co-authored-by: Vukasin Milovanovic <vmilovanovic@nvidia.com>
ttnghia
approved these changes
Oct 9, 2023
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/ok to test |
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/ok to test |
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/merge |
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Description
An empty string should be a valid minimum value for a string column, but the current parquet writer considers an empty string to have no value when writing the column chunk statistics. This PR changes all fields in the Statistics struct to be
thrust::optionalto help distinguish between a valid empty string and no value.Checklist