PARQUET-1272: Return correct row count for nested columns in ScanFileContents
PARQUET-1272: Return correct row count for nested columns in ScanFileContents

Stumbled over this while adding lists to the `alltypes_sample` in `test_parquet.py` in Arrow.

Author: Korn, Uwe <Uwe.Korn@blue-yonder.com>

Closes #457 from xhochy/PARQUET-1272 and squashes the following commits:

45efe1c [Korn, Uwe] PARQUET-1272: Return correct row count for nested columns in ScanFileContents

majetideepak/parquet-cpp,majetideepak/parquet-cpp,majetideepak/parquet-cpp,wesm/parquet-cpp,majetideepak/parquet-cpp,wesm/parquet-cpp,wesm/parquet-cpp,majetideepak/parquet-cpp,apache/parquet-cpp,apache/parquet-cpp,apache/parquet-cpp,wesm/parquet-cpp,apache/parquet-cpp,majetideepak/parquet-cpp,wesm/parquet-cpp,apache/parquet-cpp,wesm/parquet-cpp,apache/parquet-cpp