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Posted to dev@flink.apache.org by "YufeiLiu (Jira)" <ji...@apache.org> on 2020/06/10 06:57:00 UTC

[jira] [Created] (FLINK-18234) Implicit type conversion in join condition

YufeiLiu created FLINK-18234:
--------------------------------

             Summary: Implicit type conversion in join condition
                 Key: FLINK-18234
                 URL: https://issues.apache.org/jira/browse/FLINK-18234
             Project: Flink
          Issue Type: Bug
          Components: Table SQL / Planner
    Affects Versions: 1.10.1
            Reporter: YufeiLiu


Execute sql "SELECT a1, b1 FROM A JOIN B ON a2 = b4", a2(BIGINT) b4(VARCHAR) will throw exception 

{code}
org.apache.flink.table.api.TableException: VARCHAR(2147483647) and INTEGER does not have common type now

	at org.apache.flink.table.planner.plan.rules.logical.JoinConditionTypeCoerceRule$$anonfun$onMatch$1.apply(JoinConditionTypeCoerceRule.scala:76)
	at org.apache.flink.table.planner.plan.rules.logical.JoinConditionTypeCoerceRule$$anonfun$onMatch$1.apply(JoinConditionTypeCoerceRule.scala:65)
	at scala.collection.Iterator$class.foreach(Iterator.scala:891)
	at scala.collection.AbstractIterator.foreach(Iterator.scala:1334)
	at scala.collection.IterableLike$class.foreach(IterableLike.scala:72)
	at scala.collection.AbstractIterable.foreach(Iterable.scala:54)
	at org.apache.flink.table.planner.plan.rules.logical.JoinConditionTypeCoerceRule.onMatch(JoinConditionTypeCoerceRule.scala:65)
	at org.apache.calcite.plan.AbstractRelOptPlanner.fireRule(AbstractRelOptPlanner.java:328)
	at org.apache.calcite.plan.hep.HepPlanner.applyRule(HepPlanner.java:562)
	at org.apache.calcite.plan.hep.HepPlanner.applyRules(HepPlanner.java:427)
	at org.apache.calcite.plan.hep.HepPlanner.executeInstruction(HepPlanner.java:264)
	at org.apache.calcite.plan.hep.HepInstruction$RuleInstance.execute(HepInstruction.java:127)
	at org.apache.calcite.plan.hep.HepPlanner.executeProgram(HepPlanner.java:223)
	at org.apache.calcite.plan.hep.HepPlanner.findBestExp(HepPlanner.java:210)
	at org.apache.flink.table.planner.plan.optimize.program.FlinkHepProgram.optimize(FlinkHepProgram.scala:69)

{code}

Should we do some implicit type coercion in this case? It works on old version, and also can use in WHERE condition like "WHERE a4 = 3"



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