godfreyhe commented on a change in pull request #8051: [FLINK-12018]
[table-planner-blink] Add support for generating optimized logical plan for
Sort and Rank
URL: https://github.com/apache/flink/pull/8051#discussion_r270701308
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File path:
flink-table/flink-table-planner-blink/src/main/scala/org/apache/flink/table/plan/util/FlinkRelOptUtil.scala
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@@ -248,4 +251,262 @@ object FlinkRelOptUtil {
}
}
+ private[this] case class LimitPredicate(rankOnLeftSide: Boolean, pred:
RexCall)
+
+ private[this] sealed trait Boundary
+
+ private[this] case class LowerBoundary(lower: Long) extends Boundary
+
+ private[this] case class UpperBoundary(upper: Long) extends Boundary
+
+ private[this] case class BothBoundary(lower: Long, upper: Long) extends
Boundary
+
+ private[this] case class InputRefBoundary(inputFieldIndex: Int) extends
Boundary
+
+ private[this] sealed trait BoundDefine
+
+ private[this] object Lower extends BoundDefine // defined lower bound
+ private[this] object Upper extends BoundDefine // defined upper bound
+ private[this] object Both extends BoundDefine // defined lower and uppper
bound
+
+ /**
+ * Extracts the TopN offset and fetch bounds from a predicate.
+ *
+ * @param predicate predicate
+ * @param rankFieldIndex the index of rank field
+ * @param rexBuilder RexBuilder
+ * @param config TableConfig
+ * @return A Tuple2 of extracted rank range and remaining predicates.
+ */
+ def extractRankRange(
Review comment:
OK
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