ARROW-14093: [C++] subtract(date, date) -> duration kernel #12124
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The title should be |
I think so. I suppose same goes for most most ARROW-11090 jiras. |
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This now always returns in ms. Do we want to be able to output other units or is it ok to defer to casting kernels if other units are desired? |
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I don't see a problem with ms. |
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Sorry, I've been a bit backlogged, I'll try to get through these tomorrow (Friday) |
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No worries @lidavidm! :) |
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nit, but as used, the units should always match right?
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It's used to resolve duration resolution in subtract(timestamp, timestamp) -> duration and the timestamps could be of any resolution. Am I missing something?
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Ah, I was thinking, since we only register kernels where the units match, technically this max is redundant, but it doesn't hurt to have it. (Though perhaps it would be safer to DCHECK or return an error if they don't match to avoid accidentally doing arithmetic on incompatible types.)
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(I think return types are computed post-implicit-casts, right? So they should match here.)
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Ah, yes of course! Fixed. Thanks :).
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Thanks for the review @lidavidm! I've accidentally amended changes to the last commit, sorry. |
lidavidm
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Thanks, just some nits/suggestions (sorry for the back-and-forth)
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Ah, I was thinking, since we only register kernels where the units match, technically this max is redundant, but it doesn't hurt to have it. (Though perhaps it would be safer to DCHECK or return an error if they don't match to avoid accidentally doing arithmetic on incompatible types.)
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(I think return types are computed post-implicit-casts, right? So they should match here.)
| const std::vector<ValueDescr>& args) { | ||
| auto left_type = checked_cast<const TimestampType*>(args[0].type.get()); | ||
| auto right_type = checked_cast<const TimestampType*>(args[1].type.get()); | ||
| DCHECK_EQ(left_type->id(), right_type->id()); |
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nit, but the checked_cast should account for this in debug mode since the dynamic_cast will give us nullptr (or else if we're going to assert, we should assert before casting)
| RETURN_NOT_OK( | ||
| Status::Invalid("Subtraction of zoned and non-zoned times is ambiguous. (", | ||
| left_type->timezone(), right_type->timezone(), ").")); |
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nit, but just return Status::Invalid(...);?
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Benchmark runs are scheduled for baseline = c715beb and contender = 56386a4. 56386a4 is a master commit associated with this PR. Results will be available as each benchmark for each run completes. |
This is to resolve ARROW-14093.