matthewmturner commented on a change in pull request #984:
URL: https://github.com/apache/arrow-rs/pull/984#discussion_r760303658
##########
File path: arrow/src/compute/kernels/comparison.rs
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@@ -200,6 +201,42 @@ macro_rules! compare_op_scalar_primitive {
}};
}
+macro_rules! compare_dict_op_scalar {
+ ($left:expr, $right:expr, $op:expr) => {{
+ let null_bit_buffer = $left
+ .data()
+ .null_buffer()
+ .map(|b| b.bit_slice($left.offset(), $left.len()));
+
+ let values = $left
+ .values()
+ .as_any()
+ .downcast_ref::<StringArray>()
Review comment:
@alamb ive been reviewing this but i think i might be missing something.
my understanding is that my code above is for getting the dictionary values,
which can be of any type (of course above im only handling `StringArray`).
```
let values = $left
.values()
.as_any()
.downcast_ref::<StringArray>()
.unwrap()
```
But then you mention using the new `dyn_xx` kernels / creating `dyn_xx_lit`
kernels. Since theres no actual compute being done here, what would the `dyn`
kernels be used for? Or were you referring to using the kernels to replace
more than just that section of code?
to me it looks like i need a macro to downcast `DictionaryArray.values()`
into whatever type the values are, and then i could use something like
`dyn_xx_lit` on that in order to get the comparison results. Is this roughly
what you had in mind?
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