Improve performance of InternalParquetRecordReader (1%) #3226
Description
Describe the enhancement requested
Profiling the load of a Parquet file with Java Mission Control, I've noticed that InternalParquetRecordReader LongStream consumes relevant amount of time.
This LongStream can be replaced with a simpler Long Iterator that iterates from 0 to pages.getRowCount().
To measure the overhead I've created a test project that overwrites InternalParquetRecordReader implementation with a Long Iterator: https://github.com/jerolba/parquet-rowindexiterator
The execution time is sensitive to the context of the JVM, but running the benchmark multiple times shows that LongStream is slower than LongIterator, between 1% and 4% depending on the run.
Component(s)
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