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

    https://github.com/apache/spark/pull/14036#discussion_r70562757
  
    --- Diff: 
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/arithmetic.scala
 ---
    @@ -249,11 +241,12 @@ case class Divide(left: Expression, right: Expression)
           s"${eval2.value} == 0"
         }
         val javaType = ctx.javaType(dataType)
    -    val divide = if (dataType.isInstanceOf[DecimalType]) {
    +    val divide = if (dataType.isInstanceOf[DecimalType] || 
dataType.isInstanceOf[DoubleType]) {
           s"${eval1.value}.$decimalMethod(${eval2.value})"
         } else {
    -      s"($javaType)(${eval1.value} $symbol ${eval2.value})"
    +      s"($javaType)(${eval1.value} $decimalMethod ${eval2.value})"
    --- End diff --
    
    ok I see the problem. Since `symbol` is also used in the string format of 
arithmetic expression, `IntegerDivide` has to override it.
    
    I think we can:
    
    1. inline the operator in generated code, e.g. `($javaType)(${eval1.value} 
/ ${eval2.value})` instead of `($javaType)(${eval1.value} $symbol 
${eval2.value})`
    2. don't override `decimalMethod` as it's useless in the 2 division 
expressions.


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