Github user jihoonson commented on a diff in the pull request:

    https://github.com/apache/tajo/pull/662#discussion_r35947774
  
    --- Diff: 
tajo-catalog/tajo-catalog-server/src/main/java/org/apache/tajo/catalog/dictionary/InfoSchemaMetadataDictionary.java
 ---
    @@ -91,7 +91,7 @@ public String getSystemDatabaseName() {
         return systemTableNames;
       }
       
    -  private TableDescriptor getTableDescriptor(String tableName) {
    +  private TableDescriptor getTableDescriptor(String tableName) throws 
UndefinedTableException {
    --- End diff --
    
    I know you just modified the function signature to throw an exception. 
However, I found a problem that this function returns null instead of throwing 
UndefinedTableException when the table of the given name is not found.
    Would you also check it please?


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