Github user rxin commented on a diff in the pull request:
https://github.com/apache/spark/pull/10737#discussion_r49690466
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/conditionalExpressions.scala
---
@@ -137,45 +137,65 @@ case class CaseWhen(branches: Seq[(Expression,
Expression)], elseValue: Option[E
}
override def genCode(ctx: CodeGenContext, ev: GeneratedExpressionCode):
String = {
- val got = ctx.freshName("got")
+ val firstCase = {
+ val cond = branches.head._1.gen(ctx)
+ val res = branches.head._2.gen(ctx)
+ s"""
+ ${cond.code}
+ if (!${cond.isNull} && ${cond.value}) {
+ ${res.code}
+ ${ev.isNull} = ${res.isNull};
+ ${ev.value} = ${res.value};
+ }
+ """
+ }
- val cases = branches.map { case (condition, value) =>
+ val otherCases = branches.tail.map { case (condition, value) =>
val cond = condition.gen(ctx)
val res = value.gen(ctx)
+
s"""
- if (!$got) {
+ else {
${cond.code}
if (!${cond.isNull} && ${cond.value}) {
- $got = true;
${res.code}
${ev.isNull} = ${res.isNull};
${ev.value} = ${res.value};
}
- }
"""
- }.mkString("\n")
+ }
+
+ val cases = firstCase + otherCases.mkString("\n")
val elseCase = {
if (elseValue.isDefined) {
val res = elseValue.get.gen(ctx)
s"""
- if (!$got) {
- ${res.code}
- ${ev.isNull} = ${res.isNull};
- ${ev.value} = ${res.value};
- }
+ else {
+ ${res.code}
+ ${ev.isNull} = ${res.isNull};
+ ${ev.value} = ${res.value};
+ }
"""
} else {
""
}
}
+ val leftBrackets = {
+ if (otherCases.length > 0) {
+ (0 until otherCases.length).map("}").mkString("\n")
--- End diff --
this is just
```
"}\n" * otherCases.length
```
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