[jira] [Created] (FLINK-6892) Add LPAD supported in SQL

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[jira] [Created] (FLINK-6892) Add LPAD supported in SQL

JIRA jira@apache.org
sunjincheng created FLINK-6892:
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             Summary: Add LPAD supported in SQL
                 Key: FLINK-6892
                 URL: https://issues.apache.org/jira/browse/FLINK-6892
             Project: Flink
          Issue Type: Sub-task
          Components: Table API & SQL
    Affects Versions: 1.4.0
            Reporter: sunjincheng


LPAD(str,len,padstr) Returns the string str, left-padded with the string padstr to a length of len characters. If str is longer than len, the return value is shortened to len characters.

* Syntax:
LPAD(str,len,padstr)

* Arguments
**str: -
**len: -
**padstr: -

* Return Types
  String

* Example:
  LPAD('hi',4,'??') -> '??hi'
  LPAD('hi',1,'??') -> 'h'

* See more:
** [MySQL| https://dev.mysql.com/doc/refman/5.7/en/mathematical-functions.html#function_lpad]



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