Brian Mwambazi

Results 2 issues of Brian Mwambazi

This PR addresses [PARQUET-1381](https://issues.apache.org/jira/projects/PARQUET/issues/PARQUET-1381).

This PR addresses [PARQUET-1767](https://issues.apache.org/jira/browse/PARQUET-1767) The MemoryManager adjust the row group size threshold of writers when the allocated memory pool fills up. **Problem**: However InternalParquetRecordWriter only re-adjusts the row group size...