Github user kapilsingh5050 commented on a diff in the pull request:
https://github.com/apache/spark/pull/15620#discussion_r90233749
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/conditionalExpressions.scala
---
@@ -64,19 +64,72 @@ case class If(predicate: Expression, trueValue:
Expression, falseValue: Expressi
val trueEval = trueValue.genCode(ctx)
val falseEval = falseValue.genCode(ctx)
- ev.copy(code = s"""
- ${condEval.code}
- boolean ${ev.isNull} = false;
- ${ctx.javaType(dataType)} ${ev.value} =
${ctx.defaultValue(dataType)};
- if (!${condEval.isNull} && ${condEval.value}) {
- ${trueEval.code}
- ${ev.isNull} = ${trueEval.isNull};
- ${ev.value} = ${trueEval.value};
- } else {
- ${falseEval.code}
- ${ev.isNull} = ${falseEval.isNull};
- ${ev.value} = ${falseEval.value};
- }""")
+ // place generated code of condition, true value and false value in
separate methods if
+ // their code combined is large
+ val combinedLength = condEval.code.length + trueEval.code.length +
falseEval.code.length
+ val generatedCode = if (combinedLength > 1024 &&
+ // Split these expressions only if they are created from a row object
+ (ctx.INPUT_ROW != null && ctx.currentVars == null)) {
--- End diff --
I think the conversation on the change I mentioned also went like there
will be some refactoring required in whole stage code generation to support that
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