[jira] [Created] (FLINK-18212) Init lookup join failed when use udf on lookup table

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

YufeiLiu created FLINK-18212:
--------------------------------

             Summary: Init lookup join failed when use udf on lookup table
                 Key: FLINK-18212
                 URL: https://issues.apache.org/jira/browse/FLINK-18212
             Project: Flink
          Issue Type: Bug
          Components: Table SQL / Planner
    Affects Versions: 1.10.1
            Reporter: YufeiLiu


Throw exception 

{code}
Caused by: scala.MatchError: (CONCAT(_UTF-16LE'Hello', $2),_UTF-16LE'Hello,Jark':VARCHAR(2147483647) CHARACTER SET "UTF-16LE") (of class scala.Tuple2)
	at org.apache.flink.table.planner.plan.nodes.common.CommonLookupJoin.org$apache$flink$table$planner$plan$nodes$common$CommonLookupJoin$$extractConstantField(CommonLookupJoin.scala:617)
	at org.apache.flink.table.planner.plan.nodes.common.CommonLookupJoin.extractConstantFieldsFromEquiCondition(CommonLookupJoin.scala:607)
	at org.apache.flink.table.planner.plan.nodes.common.CommonLookupJoin.analyzeLookupKeys(CommonLookupJoin.scala:567)
	at org.apache.flink.table.planner.plan.nodes.common.CommonLookupJoin.<init>(CommonLookupJoin.scala:129)
	at org.apache.flink.table.planner.plan.nodes.physical.stream.StreamExecLookupJoin.<init>(StreamExecLookupJoin.scala:49)
{code}

SQL:

{code:sql}
SELECT
  T.id, T.len, T.content, D.name 
FROM 
  T JOIN userTable for system_time as of T.proctime AS D 
ON T.id = D.id 
WHERE 
  add(T.id, D.id) > 3 AND add(T.id, 2) > 3 AND CONCAT('Hello', D.name) = 'Hello,Jark'
{code}

When use function a RexCall can't match RexInputRef and cause this error, myabe shoud add {{case _ => return}} to skip this.




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