CreateQuery t_subcolumns_if (children 3)
 Identifier t_subcolumns_if
 Columns definition (children 1)
  ExpressionList (children 1)
   ColumnDeclaration id (children 1)
    DataType Nullable (children 1)
     ExpressionList (children 1)
      DataType Int64
 Storage definition (children 2)
  Function MergeTree
  Function tuple (children 1)
   ExpressionList
