pnowojski commented on a change in pull request #6787: [FLINK-8577][table] 
Implement proctime DataStream to Table upsert conversion
URL: https://github.com/apache/flink/pull/6787#discussion_r249056854
 
 

 ##########
 File path: 
flink-libraries/flink-table/src/main/scala/org/apache/flink/table/calcite/RelTimeIndicatorConverter.scala
 ##########
 @@ -215,6 +217,19 @@ class RelTimeIndicatorConverter(rexBuilder: RexBuilder) 
extends RelShuttle {
     materializerUtils.projectAndMaterializeFields(rewrittenTemporalJoin, 
indicesToMaterialize)
   }
 
+  def visit(upsertToRetraction: LogicalUpsertToRetraction): RelNode = {
+    val input = upsertToRetraction.getInput.accept(this)
+    val relTypes = input.getRowType.getFieldList.map(_.getType)
+    val timeIndicatorIndexes = relTypes.zipWithIndex
+      .filter(e => FlinkTypeFactory.isTimeIndicatorType(e._1))
+      .map(_._2).toSet
+
+    val rewrittenInput = input.copy(input.getTraitSet, input.getInputs)
 
 Review comment:
   `input` is already a `rewrittenInput`. `val rewrittenInput = 
input.copy(input.getTraitSet, input.getInputs)` looks to me as a no-op:
   1. rename `input` -> `rewrittenInput`
   2. drop copy?

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