I'm trying to fix the bug that babel parser failed(core parser succeed), I wonder if there is a more suitable solution.
Babel parser use the word after PivotAgg as an alias when the user does not write an alias. ISSUE: https://issues.apache.org/jira/browse/CALCITE-4746 I hope those who are familiar with babel parser can review it. Thank you very much. PR: https://github.com/apache/calcite/pull/2842/files
