Github user fhueske commented on a diff in the pull request:
https://github.com/apache/flink/pull/3715#discussion_r125456634
--- Diff:
flink-libraries/flink-table/src/main/scala/org/apache/flink/table/runtime/join/WindowJoinUtil.scala
---
@@ -162,24 +135,26 @@ object JoinUtil {
(l._1 ++ r._1, l._2 ++ r._2)
}
case c: RexCall =>
- val timeIndicators = analyzeSingleConditionTerm(c, leftFieldCount,
inputType)
+ val timeIndicators = extractTimeIndicatorAccesses(c,
leftFieldCount, inputType)
timeIndicators match {
case Seq() =>
(Seq(), Seq(c))
case Seq(v1, v2) =>
if (v1._1 != v2._1) {
- throw new TableException("The time indicators for each input
should be the same.")
+ throw new TableException(
+ "Both time attributes in a join condition must be of the
same type.")
}
if (v1._2 == v2._2) {
- throw new TableException("Both input's time indicators is
needed.")
+ throw new TableException("Time-based join conditions " +
+ "must reference the time attribute of both input tables.")
}
(Seq((v1._1, v1._2, c)), Seq())
--- End diff --
If we check the `RexCall` type here, we can analyze both sides of the
condition independently and also handle cases where both attributes are on the
same side of the condition.
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