Github user KurtYoung commented on a diff in the pull request:
https://github.com/apache/flink/pull/3389#discussion_r104614583
--- Diff:
flink-libraries/flink-table/src/main/scala/org/apache/flink/table/functions/utils/UserDefinedFunctionUtils.scala
---
@@ -94,23 +94,28 @@ object UserDefinedFunctionUtils {
val evalMethods = checkAndExtractEvalMethods(function)
val filtered = evalMethods
- // go over all eval methods and find one matching
- .filter { cur =>
- val signatures = cur.getParameterTypes
- // match parameters of signature to actual parameters
- (actualSignature.length >= signatures.length &&
- actualSignature.zipWithIndex.forall { case (clazz, i) =>
- (i < signatures.length && parameterTypeEquals(clazz,
signatures(i))) ||
- (i >= signatures.length - 1 && cur.isVarArgs &&
+ // go over all eval methods and filter out one and only one matching
+ .filter {
+ case cur if !cur.isVarArgs =>
+ val signatures = cur.getParameterTypes
+ // match parameters of signature to actual par(ameters
+ actualSignature.length == signatures.length &&
+ signatures.zipWithIndex.forall { case (clazz, i) =>
+ parameterTypeEquals(actualSignature(i), clazz)
+ }
+ case cur if cur.isVarArgs =>
+ val signatures = cur.getParameterTypes
+ actualSignature.zipWithIndex.forall { case (clazz, i) =>
+ (i < signatures.length - 1 &&
--- End diff --
we can also move the condition check about `i` into case pattern to make
the codes more clear, like:
```
case (clazz, i) if (i < signatures.length - 1 ) =>
// ...
case (clazz, i) if (i >= signatures.length - 1) =>
// ...
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