MINOR: Add private constructor to UuidType singleton

[tmater]

Add private constructor to UuidType singleton.

[lidavidm]

All builds fail:

Error: Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.14.0:compile (default-compile) on project arrow-vector: Compilation failure: Compilation failure: Error: /build/vector/src/main/java/org/apache/arrow/vector/UuidVector.java:[72,52] error: UuidType() has private access in UuidType
Error: /build/vector/src/main/java/org/apache/arrow/vector/UuidVector.java:[102,52] error: UuidType() has private access in UuidType

[tmater]

All builds fail:

Error: Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.14.0:compile (default-compile) on project arrow-vector: Compilation failure: Compilation failure: Error: /build/vector/src/main/java/org/apache/arrow/vector/UuidVector.java:[72,52] error: UuidType() has private access in UuidType
Error: /build/vector/src/main/java/org/apache/arrow/vector/UuidVector.java:[102,52] error: UuidType() has private access in UuidType

Thank you for looking into it @lidavidm.
I thought I ran a local build 😅.
Fully updated the UuidType usage.

[jhrotko]

LGTM!

[lidavidm]

I'll let JB handle merging

[jbonofre]

LGTM.

Do you mind to rebase in order to have CI happy ?

[tmater]

LGTM.

Do you mind to rebase in order to have CI happy ?

Thank you for the review!
Not at all, rebased.

[jbonofre]

@tmater thanks ! I just ran the CI, I will merge as soon as it's all green.

[jbonofre]

@tmater I see failure in RoundStripTest:

Error: Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.14.0:testCompile (default-testCompile) on project arrow-c-data: Compilation failure: Compilation failure: Error: /build/c/src/test/java/org/apache/arrow/c/RoundtripTest.java:[813,43] error: cannot find symbol
Error: symbol: variable INSTANCE
Error: location: class UuidType

[tmater]

@tmater I see failure in RoundStripTest:

Error: Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.14.0:testCompile (default-testCompile) on project arrow-c-data: Compilation failure: Compilation failure: Error: /build/c/src/test/java/org/apache/arrow/c/RoundtripTest.java:[813,43] error: cannot find symbol
Error: symbol: variable INSTANCE
Error: location: class UuidType

Interesting, there was a UuidType/UuidVector implementation in RoundStripTest. Removed it.