xccui commented on a change in pull request #6465: [FLINK-10008] [table]
Improve the LOG function in Table to support bases less than 1
URL: https://github.com/apache/flink/pull/6465#discussion_r207561454
##########
File path:
flink-libraries/flink-table/src/main/scala/org/apache/flink/table/runtime/functions/ScalarFunctions.scala
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@@ -103,11 +103,13 @@ object ScalarFunctions {
if (x <= 0.0) {
throw new IllegalArgumentException(s"x of 'log(base, x)' must be > 0,
but x = $x")
}
- if (base <= 1.0) {
- throw new IllegalArgumentException(s"base of 'log(base, x)' must be > 1,
but base = $base")
- } else {
- Math.log(x) / Math.log(base)
+ if (base.compareTo(1.0) == 0) {
Review comment:
Why invoking the `compareTo()` method instead of directly comparing `base`
and `1.0` here?
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