Samuel Oranyeli

[ENH] Numba support for single join

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# PR Description Please describe the changes proposed in the pull request: - Numba support extend to all matches; previous PR #1131 was just for first and last match (unsorted...

improvement suggestions for conditional_join

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- [x] allow selection/renaming of final columns within the function - [x] implement a numba alternative, for hopefully faster processing - [x] improve performance for left and right joins

replicate `select_columns` on the index

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select_columns can be adapted to index selection as well; not sure about the name though ---> select_index/select_rows? ```py df.select_index() df.select_rows() ```

Deprecate functions ?

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Central point to discuss functions to deprecate, if any? - [x] `process_text` - `transform_columns` covers this very well - [x] `impute` vs `fill_empty` - `impute` has the advantage of extra...

comments in the examples

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# Brief Description some of the examples have comments like `#doctest:...` I dont think this should show in the final output  @ericmjl @thatlittleboy

[ENH] Column renaming

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- Closes #2684 - closes #2504 Implementation for column renaming ```py from datatable import dt, f, by grades = [48, 99, 75, 80, 42, 80, 72, 68, 36, 78] data...

Implement cumulative functions

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- [x] cumsum() https://github.com/h2oai/datatable/pull/3257 - [x] cumprod() https://github.com/h2oai/datatable/pull/3304 - [x] cummax() https://github.com/h2oai/datatable/pull/3288 - [x] cummin() https://github.com/h2oai/datatable/pull/3288 - [x] cumcount() https://github.com/h2oai/datatable/pull/3310 - [x] ngroup() - not strictly cumulative https://github.com/h2oai/datatable/pull/3310 - [x]...

Create Equivalent Methods for Existing Datatable Functions

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This is a follow-up from the [discussion here](https://github.com/h2oai/datatable/discussions/2863) on adding methods to `FExpr`. The method chaining format would look like this ``DT[:, f[:].rowsum().sum()]``, which would be an equivalent for ``DT[:,...

`na.rm` or something similar for aggregations

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Not sure if there is an existing ticket, so creating this. Adding a `na.rm`(similar to R) or `skipna` (pandas flavour) parameter in aggregations might be useful I observed this in...

[BUG] replace does not work on date columns

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- Did you find a bug in datatable, or maybe the bug found you? The replace function does not work on date columns; no change is effected. - How to...