dtenedor opened a new pull request, #36861:
URL: https://github.com/apache/spark/pull/36861
### What changes were proposed in this pull request?
Update `to_number` and `try_to_number` functions to allow the `PR` format
token with input strings comprising positive numbers.
Before this bug fix, function calls like `to_number(' 123 ', '999PR')` would
fail. Now they succeed, which is helpful since `PR` should allow both positive
and negative numbers.
This satisfies the following specification:
```
to_number(expr, fmt)
fmt
{ ' [ MI | S ] [ L | $ ]
[ 0 | 9 | G | , ] [...]
[ . | D ]
[ 0 | 9 ] [...]
[ L | $ ] [ PR | MI | S ] ' }
```
### Why are the changes needed?
After reviewing the specification, this behavior makes the most sense.
### Does this PR introduce _any_ user-facing change?
Yes, a slight change in the behavior of the format string.
### How was this patch tested?
Existing and updated unit test coverage.
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