HyukjinKwon commented on a change in pull request #21599: [SPARK-26218][SQL]
Overflow on arithmetic operations returns incorrect result
URL: https://github.com/apache/spark/pull/21599#discussion_r304359980
##########
File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/arithmetic.scala
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@@ -128,17 +128,31 @@ abstract class BinaryArithmetic extends BinaryOperator
with NullIntolerant {
def calendarIntervalMethod: String =
sys.error("BinaryArithmetics must override either calendarIntervalMethod
or genCode")
+ def checkOverflowCode(result: String, op1: String, op2: String): String =
+ sys.error("BinaryArithmetics must override either checkOverflowCode or
genCode")
+
override def doGenCode(ctx: CodegenContext, ev: ExprCode): ExprCode =
dataType match {
case _: DecimalType =>
defineCodeGen(ctx, ev, (eval1, eval2) =>
s"$eval1.$decimalMethod($eval2)")
case CalendarIntervalType =>
defineCodeGen(ctx, ev, (eval1, eval2) =>
s"$eval1.$calendarIntervalMethod($eval2)")
+ // In the following cases, overflow can happen, so we need to check the
result is valid.
+ // Otherwise we throw an ArithmeticException
Review comment:
Why don't we fix it to return `null` and throw an exception when the
configuration is on? Overflowed value is already quite pointless and changing
the behaviour to return `null` by default might not be so harmful.
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