danny0405 commented on a change in pull request #10680:
[FLINK-15125][table-planner-blink] PROCTIME() computed column defined…
URL: https://github.com/apache/flink/pull/10680#discussion_r361355665
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File path:
flink-table/flink-table-planner-blink/src/main/scala/org/apache/flink/table/planner/plan/rules/logical/LogicalWindowAggregateRuleBase.scala
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@@ -138,6 +143,86 @@ abstract class
LogicalWindowAggregateRuleBase(description: String)
call.transformTo(result)
}
+ /** Trim out the HepRelVertex wrapper and get current relational expression.
*/
+ private def trimHep(node: RelNode): RelNode = {
+ node match {
+ case hepRelVertex: HepRelVertex =>
+ hepRelVertex.getCurrentRel
+ case _ => node
+ }
+ }
+
+ /**
+ * Rewrite plan with PROCTIME() as window call operand: rewrite the window
call to
+ * reference the input instead of invoke the PROCTIME() directly, in order
to simplify the
+ * subsequent rewrite logic.
+ *
+ * For example, plan
+ * <pre>
+ * LogicalProject($f0=[TUMBLE(PROCTIME(), 1000:INTERVAL SECOND)], a=[$0],
b=[$1])
+ * +- LogicalTableScan
+ * </pre>
+ *
+ * would be rewritten to
+ * <pre>
+ * LogicalProject($f0=[TUMBLE($2, 1000:INTERVAL SECOND)], a=[$0], b=[$1])
+ * +- LogicalProject(a=[$0], b=[$1], $f2=[PROCTIME()])
+ * +- LogicalTableScan
+ * </pre>
+ */
+ private def rewriteProctimeTumbling(
Review comment:
Thanks, for this pattern, it also works.
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