kou opened a new pull request, #46389:
URL: https://github.com/apache/arrow/pull/46389
### Rationale for this change
Other projects' `FindSnappy.cmake` may create `Snappy::snappy{,-static}`
CMake targets. If they are created, our `FindSnappyAlt.cmake` will be failed.
### What changes are included in this PR?
Check whether `Snappy::snappy{,-static}` are already defined to avoid
conflicting with other projects' `FindSnappy.cmake`.
### Are these changes tested?
Yes.
### Are there any user-facing changes?
Yes.
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