Explain EXPLAIN SYNTAX (children 1)
 SelectWithUnionQuery (children 1)
  ExpressionList (children 1)
   SelectQuery (children 2)
    ExpressionList (children 1)
     Function minus (children 1)
      ExpressionList (children 2)
       Function multiply (children 1)
        ExpressionList (children 2)
         Literal UInt64_2
         Function count (children 1)
          ExpressionList (children 1)
           Identifier float64
       Function sum (children 1)
        ExpressionList (children 1)
         Identifier float64
    TablesInSelectQuery (children 1)
     TablesInSelectQueryElement (children 1)
      TableExpression (children 1)
       TableIdentifier test_table
