wenhuitang opened a new pull request #1881: [CALCITE-3216] ClassCastException when running aggregate function and window function over Union URL: https://github.com/apache/calcite/pull/1881 This pull request for the issue https://issues.apache.org/jira/browse/CALCITE-3216 According to SqlTypeAssignmentRule which determine whether a type is assignable from another type, this pull request mainly realized a ExtendedCastingEnumerator which enable the cast between most of the Java numeric types.
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