[C++][Parquet] Optimize column reader by fusing definition level decoding with counting
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Component: C++
Type: enhancement
- Dominant language
- C++
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Description
### Describe the enhancement requested
There is a TODO in cpp/src/parquet/column_reader.cc to fuse definition level decoding with counting for better performance. Currently, definition levels are decoded and then counted in separate passes.
### Component(s)
C++
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