morningman opened a new pull request #1422: Cast the type of constant value in binary predicate to column type. URL: https://github.com/apache/incubator-doris/pull/1422 If one child of a binary predicate is column, and the other is a constant expr, set the compatible type to column's type. eg: k1(int): ... WHERE k1 = "123" --> k1 = cast("123" as int); k2(varchar): ... WHERE 123 = k2 --> cast(123 as varchar) = k2 This optimization is for the case that some users may use a int column to save date, eg: 20190703, but query with predicate: col = "20190703". If not casting "20190703" to int, query optimizer can not do partition prune correctly.
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