SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 4)
   ExpressionList (children 2)
    Identifier Name
    Function avgMerge (alias Value) (children 1)
     ExpressionList (children 1)
      Identifier Value.AggregateFunction(avg, Int64)
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      TableIdentifier test_agg_variant
   ExpressionList (children 1)
    Identifier Name
   ExpressionList (children 1)
    OrderByElement (children 1)
     Identifier Name
