AssertionError: mismatched type $5 TIMESTAMP(3)

[Chris Miller]

I'm trying to group some data and then enrich it by joining with a temporal table function, however my test code (attached) is failing with the error shown below. Can someone please give me a clue as to what I'm doing wrong?

    at org.apache.calcite.rex.RexInputRef.accept(RexInputRef.java:112)
    at org.apache.calcite.rex.RexShuttle.visitList(RexShuttle.java:151)
    at org.apache.calcite.rex.RexShuttle.visitCall(RexShuttle.java:100)
    at org.apache.calcite.rex.RexShuttle.visitCall(RexShuttle.java:34)
    at org.apache.calcite.rex.RexCall.accept(RexCall.java:107)
    at org.apache.calcite.rex.RexShuttle.apply(RexShuttle.java:279)
    at org.apache.calcite.rex.RexShuttle.mutate(RexShuttle.java:241)
    at org.apache.calcite.rex.RexShuttle.apply(RexShuttle.java:259)
    at org.apache.calcite.rex.RexUtil.fixUp(RexUtil.java:1605)

    at test.Test.main(Test.java:78)

Exception in thread "main" java.lang.AssertionError: mismatched type $5 TIMESTAMP(3) at org.apache.calcite.rex.RexUtil$FixNullabilityShuttle.visitInputRef(RexUtil.java:2481) at org.apache.calcite.rex.RexUtil$FixNullabilityShuttle.visitInputRef(RexUtil.java:2459) at org.apache.calcite.rel.rules.FilterJoinRule.perform(FilterJoinRule.java:230) at org.apache.calcite.rel.rules.FilterJoinRule$FilterIntoJoinRule.onMatch(FilterJoinRule.java:344) at org.apache.calcite.plan.volcano.VolcanoRuleCall.onMatch(VolcanoRuleCall.java:212) at org.apache.calcite.plan.volcano.VolcanoPlanner.findBestExp(VolcanoPlanner.java:646) at org.apache.calcite.tools.Programs$RuleSetProgram.run(Programs.java:339) at org.apache.flink.table.api.TableEnvironment.runVolcanoPlanner(TableEnvironment.scala:374) at org.apache.flink.table.api.TableEnvironment.optimizeLogicalPlan(TableEnvironment.scala:292) at org.apache.flink.table.api.StreamTableEnvironment.optimize(StreamTableEnvironment.scala:812) at org.apache.flink.table.api.StreamTableEnvironment.translate(StreamTableEnvironment.scala:860) at org.apache.flink.table.api.java.StreamTableEnvironment.toRetractStream(StreamTableEnvironment.scala:340) at org.apache.flink.table.api.java.StreamTableEnvironment.toRetractStream(StreamTableEnvironment.scala:272)

Test.java
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