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https://issues.apache.org/jira/browse/FLINK-18234?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17178487#comment-17178487
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Zhu Zhu commented on FLINK-18234:
---------------------------------
[~lzljs3620320] would you help to take a look to see if it is a valid issue?
> 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
> Priority: Major
>
> 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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