CreateQuery t_empty_order_key (children 3)
 Identifier t_empty_order_key
 Columns definition (children 1)
  ExpressionList (children 2)
   ColumnDeclaration c0 (children 1)
    DataType String
   ColumnDeclaration c1 (children 1)
    DataType String
 Storage definition (children 2)
  Function ReplacingMergeTree (children 1)
   ExpressionList
  Function tuple (children 1)
   ExpressionList
