drtconway opened a new issue, #16366:
URL: https://github.com/apache/datafusion/issues/16366
### Is your feature request related to a problem or challenge?
Thanks for an awesome platform! I'm really loving it!
In R `pmin` and `pmax` do row-wise min and max respectively. They're
reasonably verbose to replicate, and probably much less efficient than a direct
implementation. At the moment, I use the following code to achieve the same
effect:
```rust
pub fn ifelse(cond: Expr, then: Expr, otherwise: Expr) ->
datafusion::common::Result<Expr> {
case(cond)
.when(lit(true), then)
.when(lit(false), otherwise)
.end()
}
pub fn pmin(lhs: Expr, rhs: Expr) -> datafusion::common::Result<Expr> {
ifelse(lhs.clone().lt_eq(rhs.clone()), lhs, rhs)
}
pub fn pmax(lhs: Expr, rhs: Expr) -> datafusion::common::Result<Expr> {
ifelse(lhs.clone().gt_eq(rhs.clone()), lhs, rhs)
}
```
### Describe the solution you'd like
A direct, builtin implementation would be faster, and more concise, since it
could support a signature:
`fn pmin(lhs: Expr, rhs: Expr) -> Expr`.
The `ifelse` function would be nice too (I like the R equivalent too!), but
is a lower priority.
### Describe alternatives you've considered
The above code works, and isn't too awful, but a direct implementation would
be nicer.
### Additional context
_No response_
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