CreateQuery has_function (children 3)
 Identifier has_function
 Columns definition (children 1)
  ExpressionList (children 1)
   ColumnDeclaration arr (children 1)
    DataType Array (children 1)
     ExpressionList (children 1)
      DataType Nullable (children 1)
       ExpressionList (children 1)
        DataType String
 Storage definition (children 1)
  Function Memory