SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 2)
   ExpressionList (children 6)
    Function count (children 1)
     ExpressionList
    Function uniq (children 1)
     ExpressionList (children 1)
      Identifier x
    Function avg (children 1)
     ExpressionList (children 1)
      Identifier x
    Function avg (children 1)
     ExpressionList (children 1)
      Function toNullable (children 1)
       ExpressionList (children 1)
        Identifier x
    Function groupArray (children 1)
     ExpressionList (children 1)
      Identifier x
    Function groupUniqArray (children 1)
     ExpressionList (children 1)
      Identifier x
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      TableIdentifier t
