GitHub user clarkyzl opened a pull request:
https://github.com/apache/flink/pull/3389
[FLINK-5881] [table] ScalarFunction(UDF) should support variable types and
variable arguments
Type: New Feature
Priority: Major
Components: table, udf, ScalarFunction
Problem Definition: [FLINK-5881] [table] ScalarFunction(UDF) should support
variable types and variable arguments
Design:
1. Modified the getSignature() method in UserDefinedFunctionUtils, made
trailing style of variable arguments can be found. The "(TypeA a, Type B b,
TypeC... c)" or "(a: TypeA, b: TypeB, c: TypeC*)" with annotation will pass the
method.
2. Modified the SqlOperandTypeChecker, made the count range of sql operands
flexible. So it will pass the sql node validation of calcite.
3. Modified the checkAndExtractEvalMethods() method, and throw a human
readable VaidataionException if the user specified the variable arguments in
Scala and forgot to add the "@varargs" annotation. Please see the discussion in
FLINK-5826.
Impact Analysis:
It's a minor modification and it's a new feature. It impacts minimal in UDF.
Test:
Added both scala tests and java tests for all apis.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/clarkyzl/flink flink-5881
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/flink/pull/3389.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #3389
----
commit 60b68fdd66f8021f6f090e7372987d43362d5ef3
Author: Zhuoluo Yang <zhuoluo....@alibaba-inc.com>
Date: 2017-02-22T10:53:34Z
[FLINK-5881] [table] ScalarFunction(UDF) should support variable types and
variable arguments
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