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  1. Calcite
  2. CALCITE-5745

CONCAT2 function (enabled in Oracle library) gets wrong result when one of the arguments is NULL

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      Tested CONCAT function in Oracle and got the corresponding results.

      select concat('a', cast(null as varchar(20))) from DUAL;
      --- results in 'a'
      
      select concat('a', null) from DUAL;
      select 'a' ||  null from DUAL;
      --- both result in 'a'
      

      In Calcite(see checkConcat2Func() in SqlOperatorTest.java), CONCAT2 function gets null when running:

      concat('a', cast(null as varchar))
      

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            VAE ZheHu
            VAE ZheHu
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