[jira] [Created] (FLINK-27407) Exception of "unable to find common type of Boolean and Char(4)" will be thrown when RexSarg contains "Boolean" and "Char(4)"

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

luoyuxia created FLINK-27407:
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             Summary: Exception of "unable to find common type of Boolean and Char(4)" will be thrown when RexSarg contains "Boolean" and "Char(4)"
                 Key: FLINK-27407
                 URL: https://issues.apache.org/jira/browse/FLINK-27407
             Project: Flink
          Issue Type: Bug
            Reporter: luoyuxia


For Flink SQL, the following sql can be excuted:

 
{code:java}
create table t1 (id bigint, name string, is_normal_play boolean);
select * from t1 where (name = '111') and is_normal_play = 'true'; {code}
But the following sql will throw exception:

 

 
{code:java}
select * from t1 where (name = '111' or name = '222') and is_normal_play = 'true' {code}
 

After some debuging, I found the reason is the expression "(name = '111' or name = '222') and is_normal_play = 'true' "  will be simplified with each operand simplified to SEARCH operator.

So is_normal_play = 'true' will be converted to SEARCH(is_normal_play, 'true');

Then during code gen for Search operator in "SearchOperatorGen#generateSearch", it will try to find the common tyoe between Boolean and Char(4) coresponding to is_normal_play, 'true'. But there's no any implicit cast between  Boolean and Char(4), so the exception is thrown 

"

org.apache.flink.table.planner.codegen.CodeGenException: Unable to find common type of GeneratedExpression(field$10,isNull$10,,BOOLEAN,None) and Sarg[_UTF-16LE'true']:CHAR(4) CHARACTER SET "UTF-16LE".

"

.



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