Footnote 5 references "Kristy Browder and Mary Ann Davidson.The virtualprivate database in Oracle9iR2. Oracle Technical WhitePaper, Oracle Corporation. 2002." a

Footnote 5 references "Kristy Browder and Mary Ann Davidson.The virtualprivate database in Oracle9iR2. Oracle Technical WhitePaper, Oracle Corporation. 2002." and in the paper can be found under section 2, "Existing Approaches" with the text "Transparent query rewriting approaches, by contrast, avoid predefined views. Instead, they dynamically insert restrictions congruent with access policies into queries on execution [5, 8, 17]. Both view-based and query rewriting approaches increase the final query’s complexity, slowing it down (e.g., by 3–10×in Qapla [17])." Does that provide any clues? I honestly don't know since I don't know what that Oracle feature is under the hood. Also, I'd point out that my initial reaction to your post was a bit hostile, but I noticed this is a paper so "how does it differ from this $PREVIOUS_WORK" is a fair question. I thought at first it was a project someone did, where that question is perhaps still fair, but a bit, ah, strong to lead with, shall we say.