huangtianhua commented on a change in pull request #25279:
[WIP][SPARK-28519][SQL] Use StrictMath log, pow functions for platform
independence
URL: https://github.com/apache/spark/pull/25279#discussion_r308506536
##########
File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/mathExpressions.scala
##########
@@ -486,7 +483,7 @@ case class Factorial(child: Expression) extends
UnaryExpression with ImplicitCas
> SELECT _FUNC_(1);
0.0
""")
-case class Log(child: Expression) extends UnaryLogExpression(math.log, "LOG")
+case class Log(child: Expression) extends UnaryLogExpression(StrictMath.log,
"LOG")
Review comment:
Maybe we should modify math.exp to StrictMath.exp in line 361:
# on aarch64
scala> StrictMath.exp(1.0)
res4: Double = 2.7182818284590455
scala> math.exp(1.0)
res5: Double = 2.7182818284590455
# on x86_64:
scala> math.exp(1.0)
res44: Double = 2.718281828459045
scala> StrictMath.exp(1.0)
res45: Double = 2.7182818284590455
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