CreateQuery sorting_key_empty_tuple (children 3)
 Identifier sorting_key_empty_tuple
 Columns definition (children 1)
  ExpressionList (children 2)
   ColumnDeclaration a (children 1)
    DataType int
   ColumnDeclaration b (children 1)
    DataType int
 Storage definition (children 3)
  Function MergeTree (children 1)
   ExpressionList
  Function tuple (children 1)
   ExpressionList
  Set
