liuxian created SPARK-21007:
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Summary: Add SQL function - RIGHT && LEFT
Key: SPARK-21007
URL: https://issues.apache.org/jira/browse/SPARK-21007
Project: Spark
Issue Type: Improvement
Components: SQL
Affects Versions: 2.2.0
Reporter: liuxian
Add SQL function - RIGHT && LEFT, same as MySQL:
https://dev.mysql.com/doc/refman/5.7/en/string-functions.html#function_left
https://dev.mysql.com/doc/refman/5.7/en/string-functions.html#function_right
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