CreateQuery t1 (children 3)
 Identifier t1
 Columns definition (children 1)
  ExpressionList (children 1)
   ColumnDeclaration c0 (children 1)
    DataType Nullable (children 1)
     ExpressionList (children 1)
      DataType Int64
 Storage definition (children 3)
  Function MergeTree (children 1)
   ExpressionList
  StorageOrderByElement (children 1)
   Identifier c0
  Set
