uros-db opened a new pull request, #51715:
URL: https://github.com/apache/spark/pull/51715
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### What changes were proposed in this pull request?
Implement the `timediff` function, which returns the difference between two
times measured in units.
Syntax
```
timediff(unit, start, end)
unit
{ MICROSECOND |
MILLISECOND |
SECOND |
MINUTE |
HOUR }
```
Arguments
- `unit`: A unit of measure.
- `start`: A starting TIME expression.
- `end`: An ending TIME expression.
Returns
An INTEGER.
If start is greater than end the result is negative.
### Why are the changes needed?
Users will be able to calculate time difference in specified units.
### Does this PR introduce _any_ user-facing change?
Yes, this PR introduces a new expression.
### How was this patch tested?
New unit tests for time truncation, catalyst expression level unit tests
with & without codegen, e2e SQL tests / golden files in both ANSI and non-ANSI
modes.
### Was this patch authored or co-authored using generative AI tooling?
No.
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