Troubleshoot `testMetadataColumnStatsIndexPartialProjection` flakiness

[hudi-bot]

Test is periodically failing in CI, trying it repro locally was able to make it fail only once (w/ valueCount flip-flopping b/w 3 and 4 for a single file) out of a dozen runs.

Examples of failing runs:

[https://dev.azure.com/apache-hudi-ci-org/apache-hudi-ci/_build/results?buildId=13428&view=logs&j=3272dbb2-0925-5f35-bae7-04e75ae62175&t=fb428e45-27ff-524a-7e12-db1cb49c418a&s=ee3800fd-6e81-525f-e564-94108585217d]

 

JIRA info

• Link: https://issues.apache.org/jira/browse/HUDI-5354
• Type: Bug
• Epic: https://issues.apache.org/jira/browse/HUDI-4302

[hudi-bot]

Linked PR(s)

• [WIP][HUDI-5354] Fixing CSI index test #7478