Hi devs, I have opened a PR regarding lambda expressions, Calcite will support lambda expressions like `(a, b) - > a+ b` in function parameters if this PR is merged.
This PR includes the following: - Parse, validation, SqlToRel and RelToSql for lambda expressions. - Execution of higher-order functions for EnumerableConvention. - Addition of the EXISTS function to verify the correctness of the execution results of higher-order functions. For more details, please refer to the following links: [1] https://github.com/apache/calcite [2] https://issues.apache.org/jira/browse/CALCITE-3679 [3] https://issues.apache.org/jira/browse/CALCITE-6116 Best, Hongyu
