Statistics #53
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Statistics #53
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Improved tests required: should capture statistics that are different across pages and row_groups and include null_values and unique_value counts |
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Not ready to merge. |
* bitpacking should work for any length of data, not just multiple of 8 (last packed is padded if less than 8) * Improve runs estimation - only start a new run if we are at a mod 8 === 0, otherwise use bitpacking
This moves data into encoded buffer as soon as possible, reducing memory requirements for the whole rowGroup
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Default for all columns unless `statistics: false` in the field definition
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Hi, I see this PR has been pending for almost a year now. Do you need any help? |
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Is there anything I could do to help with this PR? |
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Subsequent to #52
Calculate statistics for each page and each column, including:
max_value, min_value, null_count, distinct_count. For any columns that are sorted, the statistics either on column level or page level allows skipping over sections that are not of interest.