SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 2)
   ExpressionList (children 1)
    Function quantileMerge (children 1)
     ExpressionList (children 1)
      Asterisk
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      Subquery (children 1)
       SelectWithUnionQuery (children 1)
        ExpressionList (children 2)
         SelectQuery (children 1)
          ExpressionList (children 1)
           Function quantilesState (alias a) (children 2)
            ExpressionList (children 1)
             Literal UInt64_1
            ExpressionList (children 1)
             Literal Float64_0.5
         SelectQuery (children 1)
          ExpressionList (children 1)
           Function quantileStateIf (children 1)
            ExpressionList (children 2)
             Literal UInt64_2
             Function identity (children 1)
              ExpressionList (children 1)
               Literal UInt64_1
