Github user ueshin commented on a diff in the pull request:
https://github.com/apache/spark/pull/15480#discussion_r83530625
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/codegen/GenerateOrdering.scala
---
@@ -118,7 +118,45 @@ object GenerateOrdering extends
CodeGenerator[Seq[SortOrder], Ordering[InternalR
}
"""
}.mkString("\n")
- comparisons
+
+ /*
+ * 40 = 7000 bytes / 170 (around 170 bytes per ordering comparison).
+ * The maximum byte code size to be compiled for HotSpot is 8000 bytes.
+ * We should keep less than 8000 bytes.
+ */
+ val numberOfComparisonsThreshold = 40
+
+ if (ordering.size <= numberOfComparisonsThreshold) {
+ s"""
+ | InternalRow ${ctx.INPUT_ROW} = null; // Holds current row
being evaluated.
+ | ${comparisons(ordering)}
+ """.stripMargin
+ } else {
+ val groupedOrderingItr =
ordering.grouped(numberOfComparisonsThreshold)
+ var groupedOrderingLength = 0
+ groupedOrderingItr.zipWithIndex.foreach { case (orderingGroup, i) =>
+ groupedOrderingLength += 1
+ val funcName = s"compare_$i"
+ val funcCode =
+ s"""
+ |private int $funcName(InternalRow a, InternalRow b) {
+ | InternalRow ${ctx.INPUT_ROW} = null; // Holds current row
being evaluated.
+ | ${comparisons(orderingGroup)}
+ | return 0;
+ |}
+ """.stripMargin
+ ctx.addNewFunction(funcName, funcCode)
+ }
+
+ (0 to groupedOrderingLength - 1).map { i =>
--- End diff --
nit: use `(0 until groupedOrderingLength)`.
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