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There are several situations where it would be useful to reverse the order of a dataset. This could be done more efficiently than a sort. The change would need to cover the following particular cases:
- inline datasets. (These could generally iterate in reverse, imposing no run time overhead)
- grouped datasets - reverse just within the group
There is also opportunity for various optimizations - e.g., REVERSE(SORT())->SORT'
More details coming soon.
If you are interested in this project, please contact Gavin Halliday.
Completion of this project involves:
- Adding the syntax to the language
- Adding support for a new logical operation
- Generate the activity helper
- Add support for grouped and local reverse to all the engines
- Add support for global reverse to Thor.
- Implementing REVERSE for an inline dataset operation
- Investigate what optimizations can be performed
By the mid term review we would expect you to have:
- Add syntax, and represent a new logical operation
- Produce test cases for the different variants
- A grouped and local variation of the activity implemented in one of the engines.
Backup Mentor: TBD
End of project