Dylan He created FLINK-35997:
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             Summary: Incomplete Table API & Python API of built-in function 
LTRIM & RTRIM
                 Key: FLINK-35997
                 URL: https://issues.apache.org/jira/browse/FLINK-35997
             Project: Flink
          Issue Type: Improvement
          Components: Table SQL / API
            Reporter: Dylan He


Currently, Table API & Python API for built-in function LTRIM supports only one 
syntax:
{code:java}
expr.ltrim()
{code}
While SQL API supports two syntax:
{code:sql}
LTRIM(expr)
LTRIM(expr, trimStr)
{code}
The missing syntax should be incorporated, Python API as well.
The same applies to function RTRIM.



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