Explain EXPLAIN SYNTAX (children 1)
 SelectWithUnionQuery (children 1)
  ExpressionList (children 1)
   SelectQuery (children 1)
    ExpressionList (children 1)
     Function tuple (children 1)
      ExpressionList (children 4)
       Function toIntervalSecond (children 1)
        ExpressionList (children 1)
         Literal Int64_-1
       Function toIntervalMinute (children 1)
        ExpressionList (children 1)
         Literal UInt64_2
       Function toIntervalMonth (children 1)
        ExpressionList (children 1)
         Literal Int64_-3
       Function toIntervalYear (children 1)
        ExpressionList (children 1)
         Literal UInt64_1