EveyWu created CALCITE-6260:
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Summary: Add already implemented functions in Spark library
Key: CALCITE-6260
URL: https://issues.apache.org/jira/browse/CALCITE-6260
Project: Calcite
Issue Type: Improvement
Reporter: EveyWu
Add Spark functions that have been implemented but have different
OperandTypes/Returns.
Spark Functions Link：[https://spark.apache.org/docs/latest/api/sql/index.html]
Add function List：
* CHR
* CONCAT_WS
* REGEXP
* REVERSE
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