SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 3)
   ExpressionList (children 4)
    Function count (children 1)
     ExpressionList
    Function min (children 1)
     ExpressionList (children 1)
      Identifier k
    Function max (children 1)
     ExpressionList (children 1)
      Identifier k
    Function avg (children 1)
     ExpressionList (children 1)
      Identifier k
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      TableIdentifier t1
   Set
