DonnyZone opened a new pull request #1684: [CALCITE-3627] Incorrect null semantic for ROW function URL: https://github.com/apache/calcite/pull/1684 As illustrated in [CALCITE-3627](https://issues.apache.org/jira/browse/CALCITE-3627) This PR: (1) allows `ROW` function's return type can be nullable; (2) introduces a new NullPolicy (`ALL`) to implements the special semantic.
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