Dhirenda Gautam created CALCITE-3771:
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Summary: Support of TRIM function for SPARK dialect and
improvement in HIVE Dialect
Key: CALCITE-3771
URL: https://issues.apache.org/jira/browse/CALCITE-3771
Project: Calcite
Issue Type: Improvement
Components: core
Reporter: Dhirenda Gautam
In current Calcite implementation for query : SELECT TRIM('ABC') for SPARK
Dialect it gets translated into SELECT TRIM(BOTH ' ' FROM 'ABC') .
But the proper query for SPARK is :: SELECT TRIM('ABC')
Unparse logic for the trim has been handled in Spark dialect to convert the
source Trim query into valid SPARK query.
Also,In HIVE/SPARK dialect TRIM with two operand is not supported
Eg: SELECT TRIM(BOTH 'a' from 'ABC') So its equivalent is REGEXP_REPLACE which
is handle in unparseTrim function.
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