Fixing performance hits in reading Column Stats Index:
[HUDI-3834] There's substantial performance degradation in Avro 1.10 default generated Builder classes: they by default rely on SpecificData.getForSchema that load corresponding model's class using reflection, which takes a hit when executed on the hot-path (this was bringing overall runtime to read full Column Stats Index of 800k records to 60s, whereas now it's taking mere 3s)
Addressing memory churn by over-used Hadoop's Path creation: Path ctor is not a lightweight sequence and produces quite a bit of memory churn adding pressure on GC. Cleaning such avoidable allocations up to make sure there's no unnecessarily added pressure on GC.
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