Github user lw-lin commented on a diff in the pull request:
https://github.com/apache/spark/pull/15480#discussion_r95306902
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/codegen/GenerateOrdering.scala
---
@@ -117,8 +117,31 @@ object GenerateOrdering extends
CodeGenerator[Seq[SortOrder], Ordering[InternalR
}
}
"""
- }.mkString("\n")
- comparisons
+ }
+
+ ctx.splitExpressions(
+ expressions = comparisons,
+ funcName = "compare",
+ arguments = Seq(("InternalRow", "a"), ("InternalRow", "b")),
+ returnType = "int",
+ makeSplitFunction = { body =>
+ s"""
+ InternalRow ${ctx.INPUT_ROW} = null; // Holds current row being
evaluated.
+ $body
+ return 0;
+ """
+ },
+ foldFunctions = { funCalls =>
+ val comp = ctx.freshName("comp")
+ funCalls.zipWithIndex.map { case (funCall, i) =>
+ s"""
+ int ${comp}_$i = $funCall;
--- End diff --
thanks for clarifying on this. but we'll get something like (suppose we get
a fresh name `comp_1`):
```java
/* 15388 */ public int compare(InternalRow a, InternalRow b) {
/* 15389 */
/* 15390 */ int comp_1 = compare_0(a, b); // comp_1
/* 15391 */ if (comp_1 != 0) {
/* 15392 */ return comp_1;
/* 15393 */ }
/* 15394 */
/* 15395 */ int comp_1 = compare_1(a, b); // still comp_1
/* 15396 */ if (comp_1 != 0) {
/* 15397 */ return comp_1;
/* 15398 */ }
/* 1.... */
/* 1.... */ ...
/* 1.... */
/* 15450 */ return 0;
/* 15451 */ }
```
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