yanlin-Lynn opened a new pull request #1421: [CALCITE-3306] Add built-in REGEXP_SPLIT_TO_ARRAY function. URL: https://github.com/apache/calcite/pull/1421 This PR tries to add a built-in REGEXP_SPLIT_TO_ARRAY for calcite. Currently, there exists no coresponding **split** function in calcite like the **regexp_split_to_array** in [PostgreSQL](https://www.postgresql.org/docs/9.1/functions-matching.html). Although we can solve this by creating an udf, but a built in function might be better, in case some others may have the same need.
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