SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 3)
   ExpressionList (children 2)
    Function arrayReduce (children 1)
     ExpressionList (children 2)
      Literal \'quantiles(0.5, 0.9)\'
      Function range (alias r) (children 1)
       ExpressionList (children 1)
        Identifier number
    Identifier r
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      TableIdentifier system.numbers
   Literal UInt64_12