dgd-contributor commented on a change in pull request #33459:
URL: https://github.com/apache/spark/pull/33459#discussion_r676686936
##########
File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/util/NumberConverter.scala
##########
@@ -49,12 +49,14 @@ object NumberConverter {
*/
private def encode(radix: Int, fromPos: Int, value: Array[Byte]): Long = {
var v: Long = 0L
- val bound = java.lang.Long.divideUnsigned(-1 - radix, radix) // Possible
overflow once
+ // bound will always positive since radix >= 2
+ val bound = java.lang.Long.divideUnsigned(-1 - radix, radix)
Review comment:
bound is the max value which can multiply by radix without overflow when
we treat Long value as Unsigned Long value, so if v is greater than bound,
v*radix will cause overflow
##########
File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/util/NumberConverter.scala
##########
@@ -49,12 +49,14 @@ object NumberConverter {
*/
private def encode(radix: Int, fromPos: Int, value: Array[Byte]): Long = {
var v: Long = 0L
- val bound = java.lang.Long.divideUnsigned(-1 - radix, radix) // Possible
overflow once
+ // bound will always positive since radix >= 2
+ val bound = java.lang.Long.divideUnsigned(-1 - radix, radix)
Review comment:
so if v is greater than bound, v*radix will cause overflow
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