Explain EXPLAIN SYNTAX (children 1)
 SelectWithUnionQuery (children 1)
  ExpressionList (children 1)
   SelectQuery (children 5)
    ExpressionList (children 1)
     Asterisk
    TablesInSelectQuery (children 1)
     TablesInSelectQueryElement (children 1)
      TableExpression (children 1)
       TableIdentifier system.one
    Literal UInt64_1
    ExpressionList (children 2)
     Function plus (children 1)
      ExpressionList (children 2)
       Literal UInt64_0
       Identifier dummy
     Function minus (children 1)
      ExpressionList (children 2)
       Literal UInt64_0
       Identifier dummy
    Literal UInt64_1
