[jira] [Created] (CALCITE-3318) Preserving CAST of STRING operands in comparison operator

["Soma Mondal (Jira)" <ji...@apache.org>]

Soma Mondal created CALCITE-3318:
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             Summary: Preserving CAST of STRING operands in comparison operator
                 Key: CALCITE-3318
                 URL: https://issues.apache.org/jira/browse/CALCITE-3318
             Project: Calcite
          Issue Type: Bug
          Components: core
    Affects Versions: 1.20.0
            Reporter: Soma Mondal


We have a REL which has this information
select * from employee where employee_id = cast('12' as float);

but Calcite removes the CAST from the STRING literal('12' in our case). 
select * from employee where employee_id = '12';

There are dialects which needs explicit casting in the above case and we need to maintain the CAST in our dialect.

Calcite removes the cast in SqlImplementor's stripCastFromString() method.

I'm thinking of having the dialect intercept this and decide whether or not to remove the cast.



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