#384 Initial Changes for confirmation

[ssonthal]

Resolves #384

List of Changes -

1. A new property in IBatchContext called as NullPage set to new Page((*ptr)0).
2. All DeleteByPrefix methods checking if prefix is empty, then registering the page for future reuse and returning batch.NullPage.

Pending Changes -
Recursively calling for child pages (if the prefix is empty) - need help here.

[ssonthal]

Hey @Scooletz do these changes look good?

[Scooletz]

Looks really promising 🙂
Some test could be added to ensure that the tree is properly rolled up and the pages are reused. Like: writing a big tree in one block, removing in other, spinning one block to make them reusable and reuse again.

Scheduled a run for GH workflow and added some remarks that should improve the logic.

[ssonthal]

Hi @Scooletz , i made the suggested fix in the NullPage declaration. Will work on the test cases like you suggested.

[ssonthal]

Hey @Scooletz , I couldn't pick it up earlier due to other work. Resuming it now. Can you kindly help me with existing code references to write these test cases?

I looked over the PagedDbTests.cs and existing DeleteByPrefix test methods. But I think what you described requires a different approach.