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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