SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 2)
   ExpressionList (children 1)
    Asterisk
   TablesInSelectQuery (children 2)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      TableIdentifier products (alias p)
    TablesInSelectQueryElement (children 2)
     TableExpression (children 1)
      TableIdentifier cat_hist (alias c)
     TableJoin (children 1)
      ExpressionList (children 1)
       Identifier categoryId