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## What changes were proposed in this pull request? Refactor ColumnStat to be more flexible. * Split `ColumnStat` and `CatalogColumnStat` just like `CatalogStatistics` is split from `Statistics`. This detaches how the statistics are stored from how they are processed in the query plan. `CatalogColumnStat` keeps `min` and `max` as `String`, making it not depend on dataType information. * For `CatalogColumnStat`, parse column names from property names in the metastore (`KEY_VERSION` property), not from metastore schema. This means that `CatalogColumnStat`s can be created for columns even if the schema itself is not stored in the metastore. * Make all fields optional. `min`, `max` and `histogram` for columns were optional already. Having them all optional is more consistent, and gives flexibility to e.g. drop some of the fields through transformations if they are difficult / impossible to calculate. The added flexibility will make it possible to have alternative implementations for stats, and separates stats collection from stats and estimation processing in plans. ## How was this patch tested? Refactored existing tests to work with refactored `ColumnStat` and `CatalogColumnStat`. New tests added in `StatisticsSuite` checking that backwards / forwards compatibility is not broken. Author: Juliusz Sompolski <julek@databricks.com> Closes #20624 from juliuszsompolski/SPARK-23445. |
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