CreateQuery users_ext (children 3)
 Identifier users_ext
 Columns definition (children 1)
  ExpressionList (children 2)
   ColumnDeclaration uid (children 1)
    DataType Int16
   ColumnDeclaration nullableStringCol (children 1)
    DataType Nullable (children 1)
     ExpressionList (children 1)
      DataType String
 Storage definition (children 1)
  Function Memory
