HIVE-28327: Fix TruncDateFromTimestamp

[ngsg]

What changes were proposed in this pull request?

Do null-check and skip applying truncDate() if input is null.

Why are the changes needed?

Current TimeDateFromString throws NullPointerException due to the lack of null-check.

Does this PR introduce any user-facing change?

No

Is the change a dependency upgrade?

No

How was this patch tested?

Using vector_udf_trunc.q. Also I changed the test driver to TestMiniLlapLocalCliDriver, which becomes the default test driver since HIVE-23510.

[sonarqubecloud[bot]]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
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