Github user rxin commented on a diff in the pull request:
https://github.com/apache/spark/pull/6519#discussion_r35950642
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/codegen/CodeGenerator.scala
---
@@ -216,6 +226,21 @@ class CodeGenContext {
case dt: DataType if isPrimitiveType(dt) => s"($c1 > $c2 ? 1 : $c1 <
$c2 ? -1 : 0)"
case BinaryType =>
s"org.apache.spark.sql.catalyst.util.TypeUtils.compareBinary($c1, $c2)"
case NullType => "0"
+ case s: StructType if s.supportOrdering(s) =>
+ val ordering = s.fields.map(_.dataType).zipWithIndex.map {
+ case(dt, index) => new SortOrder(BoundReference(index, dt,
nullable = true), Ascending)
+ }
+ val comparisons = GenerateOrdering.genComparisons(ordering, this)
+ val funcCode: String =
+ s"""
+ public int compareStruct(InternalRow a, InternalRow b) {
--- End diff --
wouldn't this fail on nested struct?
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