Explain EXPLAIN SYNTAX (children 1)
 SelectWithUnionQuery (children 1)
  ExpressionList (children 1)
   SelectQuery (children 1)
    ExpressionList (children 1)
     Function CAST (alias c) (children 1)
      ExpressionList (children 2)
       Function plus (children 1)
        ExpressionList (children 2)
         Function plus (children 1)
          ExpressionList (children 2)
           Function CAST (children 1)
            ExpressionList (children 2)
             Literal \'0.1\'
             Literal \'Decimal(4, 4)\'
           Function CAST (children 1)
            ExpressionList (children 2)
             Literal \'0.2\'
             Literal \'Decimal(4, 4)\'
         Function CAST (children 1)
          ExpressionList (children 2)
           Literal \'0.3\'
           Literal \'Decimal(4, 4)\'
       Literal \'Decimal(4, 4)\'
