SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 2)
   ExpressionList (children 1)
    Function quantiles (children 2)
     ExpressionList (children 1)
      Identifier c1
     ExpressionList (children 2)
      Literal Float64_0.5
      Literal Float64_0.9
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      Function VALUES (children 1)
       ExpressionList (children 1)
        Function CAST (children 1)
         ExpressionList (children 2)
          Literal \'0\'
          Literal \'Nullable(UInt8)\'
