AngersZhuuuu opened a new pull request #30805:
URL: https://github.com/apache/spark/pull/30805
### What changes were proposed in this pull request?
We are easy to drop some column when use DF/DS api `drop` but difficult when
use SQL when there are so many columns.
Add a function to support this:
```
usage = """
_FUNC_(expr*) - Returns the columns except columns given in function
parameters.
""",
examples = """
Examples:
> select * FROM TBL;
A B C
1 2 3
> SELECT _FUNC_(a, b) FROM TBL;
C
3
```
### Why are the changes needed?
Provide a way to handle drop column in SQL
### Does this PR introduce _any_ user-facing change?
Yes, user can use `all_columns_except` func in projection list to handle
complex drop column scenario
### How was this patch tested?
Added UT
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