Github user cloud-fan commented on a diff in the pull request:

    https://github.com/apache/spark/pull/15620#discussion_r90191951
  
    --- 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'm curious about how other similar patches handle whole stage codegen, any 
ideas?


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