danny0405 commented on a change in pull request #1837: [CALCITE-3835] 
Overloaded table functions fail with an assertion error if param types differ
URL: https://github.com/apache/calcite/pull/1837#discussion_r397766734
 
 

 ##########
 File path: core/src/main/java/org/apache/calcite/sql/SqlUtil.java
 ##########
 @@ -676,14 +680,16 @@ public static boolean matchRoutinesByParameterCount(
   }
 
   private static RelDataType bestMatch(List<SqlFunction> sqlFunctions, int i,
-      RelDataTypePrecedenceList precList) {
+      List<String> argNames, RelDataTypePrecedenceList precList) {
     RelDataType bestMatch = null;
     for (SqlFunction function : sqlFunctions) {
       List<RelDataType> paramTypes = function.getParamTypes();
       if (paramTypes == null) {
         continue;
       }
-      final RelDataType paramType = paramTypes.get(i);
+      final RelDataType paramType = argNames != null
+          ? paramTypes.get(function.getParamNames().indexOf(argNames.get(i)))
 
 Review comment:
   Does all kinds of functions return a non-empty list if the method call have 
parameter names ? I don't think so, and how about 
`function.getParamNames().indexOf(argNames.get(i))` returns `-1` there ?

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