[GitHub] [incubator-doris] kangkaisen commented on a change in pull request #4439: Validate the param of rand function in compile step

[GitBox]

kangkaisen commented on a change in pull request #4439:
URL: https://github.com/apache/incubator-doris/pull/4439#discussion_r476426636



##########
File path: fe/fe-core/src/main/java/org/apache/doris/analysis/Expr.java
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@@ -1405,7 +1405,15 @@ protected Function getBuiltinFunction(
             throws AnalysisException {
         FunctionName fnName = new FunctionName(name);
         Function searchDesc = new Function(fnName, argTypes, Type.INVALID, 
false);
-        return Catalog.getCurrentCatalog().getFunction(searchDesc, mode);
+        Function f = Catalog.getCurrentCatalog().getFunction(searchDesc, mode);
+        if (f != null && fnName.getFunction().equalsIgnoreCase("rand")) {
+            if (this.children != null

Review comment:
       children is init with `Lists.newArrayList();` in `TreeNode`, so it won't 
be null.




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