dtenedor opened a new pull request, #47817:
URL: https://github.com/apache/spark/pull/47817
### What changes were proposed in this pull request?
This PR creates SQL function aliases for 'zeroifnull' and 'nullifzero'.
These are equivalent to `nvl(input, 0)` and `if(input = 0, null, input)`,
respectively. The analyzer performs these replacements inline in this PR to
take advantage of existing query optimizations for `nvl` and `if` expressions.
For example:
```
> select zeroifnull(null);
0
> select zeroifnull(2);
2
> select nullifzero(0);
null
> select nullifzero(2);
2
```
### Why are the changes needed?
We are adding these functions for compatibility with other systems which
also have these SQL functions.
### Does this PR introduce _any_ user-facing change?
Yes, see above.
### How was this patch tested?
This PR adds unit test coverage.
### Was this patch authored or co-authored using generative AI tooling?
No.
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