gengliangwang commented on a change in pull request #25461:
[SPARK-28741][SQL]Throw exceptions when casting to integers causes overflow
URL: https://github.com/apache/spark/pull/25461#discussion_r316901682
##########
File path:
sql/catalyst/src/test/scala/org/apache/spark/sql/catalyst/expressions/CastSuite.scala
##########
@@ -1075,4 +1075,113 @@ class CastSuite extends SparkFunSuite with
ExpressionEvalHelper {
checkEvaluation(cast("badvalue", dataType), null)
}
}
+
+ private def testIntMaxAndMin(dt: DataType): Unit = {
+ Seq(Int.MaxValue + 1L, Int.MinValue - 1L).foreach { value =>
+ checkExceptionInExpression[ArithmeticException](cast(value, dt),
"overflow")
+
checkExceptionInExpression[ArithmeticException](cast(Decimal(value.toString),
dt), "overflow")
+ checkExceptionInExpression[ArithmeticException](
+ cast(Literal(value * MICROS_PER_SECOND, TimestampType), dt),
"overflow")
+ checkExceptionInExpression[ArithmeticException](
+ cast(Literal(value * 1.5f, FloatType), dt), "overflow")
+ checkExceptionInExpression[ArithmeticException](
+ cast(Literal(value * 1.0, DoubleType), dt), "overflow")
+ }
+ }
+
+ private def testLongMaxAndMin(dt: DataType): Unit = {
+ Seq(Decimal(Long.MaxValue) + Decimal(1), Decimal(Long.MinValue) -
Decimal(1)).foreach { value =>
+ checkExceptionInExpression[ArithmeticException](
+ cast(value, dt), "overflow")
+ checkExceptionInExpression[ArithmeticException](
+ cast((value * Decimal(1.1)).toFloat, dt), "overflow")
+ checkExceptionInExpression[ArithmeticException](
+ cast((value * Decimal(1.1)).toDouble, dt), "overflow")
+ }
+ }
+
+ test("Cast to byte with option FAIL_ON_INTEGER_OVERFLOW enabled") {
+ withSQLConf(SQLConf.FAIL_ON_INTEGER_OVERFLOW.key -> "true") {
+ testIntMaxAndMin(ByteType)
Review comment:
I think it is always good to have more test cases if it doesn't increase the
testing time.
For example,
If casting double to byte is implemented as:
```
val x = doubleValue.toShort
if (x.toByte == x) {
x.toByte
} else {
throw new ...
}
```
We can find that it is wrong with this test case, because
```
(Int.MaxValue+1.0).toShort.toByte == (Int.MaxValue+1.0).toShort
```
is true.
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