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 sum (children 1)
        ExpressionList (children 1)
         Function minus (children 1)
          ExpressionList (children 2)
           Literal UInt64_2
           Identifier uint64
       Function sum (children 1)
        ExpressionList (children 1)
         Function minus (children 1)
          ExpressionList (children 2)
           Literal UInt64_3
           Identifier uint64
    TablesInSelectQuery (children 1)
     TablesInSelectQueryElement (children 1)
      TableExpression (children 1)
       TableIdentifier test_table
