[SPARK-31532][SPARK-31234][SQL][FOLLOWUP] Use lowercases for GLOBAL_TEMP_DATABASE config in SparkSessionBuilderSuite

[maropu]

What changes were proposed in this pull request?

This PR intends to fix test code for using lowercases for the GLOBAL_TEMP_DATABASE config in SparkSessionBuilderSuite. The handling of the config is different between branch-3.0+ and branch-2.4. In branch-3.0+, Spark always lowercases a value in the config, so I think we had better always use lowercases for it in the test.

This comes from the @dongjoon-hyun
comment: #28316 (comment)

Why are the changes needed?

To fix the test failure in branch-2.4.

Does this PR introduce any user-facing change?

No.

How was this patch tested?

Fixed the test.

[maropu]

cc: @dongjoon-hyun @cloud-fan @yaooqinn

[yaooqinn]

LGTM. shall we tag SPARK-31234 too？ maybe add some comment with the change

[dongjoon-hyun]

Hi, @maropu .
Sorry. I wasn't clear enough. I meant a follow PR for branch-2.4 only and to change the string in assert. We should keep .config(GLOBAL_TEMP_DATABASE.key, ... part for test coverage.

[maropu]

Ah, I see. I'll close this.

[SparkQA]

Test build #121793 has finished for PR 28338 at commit fea2375.

• This patch fails due to an unknown error code, -9.
• This patch merges cleanly.
• This patch adds no public classes.