morningman opened a new pull request #2914: [UDF] Fix bug that UDF can't handle constant null value URL: https://github.com/apache/incubator-doris/pull/2914 This CL modify the `evalExpr()` of `ExpressionFunctions`, so that it won't change the `FunctionCallExpr` to `NullLiteral` when there is null parameter in UDF. Which will fix the problem described in ISSUE: #2913
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