[HUDI-242] Support for RFC-12/Bootstrapping of external datasets to hudi (#1876)

- [HUDI-418] Bootstrap Index Implementation using HFile with unit-test
 - [HUDI-421] FileSystem View Changes to support Bootstrap with unit-tests
 - [HUDI-424] Implement Query Side Integration for querying tables containing bootstrap file slices
 - [HUDI-423] Implement upsert functionality for handling updates to these bootstrap file slices
 - [HUDI-421] Bootstrap Write Client with tests
 - [HUDI-425] Added HoodieDeltaStreamer support
 - [HUDI-899] Add a knob to change partition-path style while performing metadata bootstrap
 - [HUDI-900] Metadata Bootstrap Key Generator needs to handle complex keys correctly
 - [HUDI-424] Simplify Record reader implementation
 - [HUDI-423] Implement upsert functionality for handling updates to these bootstrap file slices
 - [HUDI-420] Hoodie Demo working with hive and sparkSQL. Also, Hoodie CLI working with bootstrap tables

Co-authored-by: Mehrotra <uditme@amazon.com>
Co-authored-by: Vinoth Chandar <vinoth@apache.org>
Co-authored-by: Balaji Varadarajan <varadarb@uber.com>

LICENSE

@@ -206,6 +206,7 @@
 This product includes code from Apache Hive.
 
 * org.apache.hadoop.hive.ql.io.CombineHiveInputFormat copied to org.apache.hudi.hadoop.hive.HoodieCombineHiveInputFormat
+* org.apache.hadoop.hive.serde2.ColumnProjectionUtils copied and modified to org.apache.hudi.hadoop.HoodieColumnProjectionUtils
 
 Copyright: 2011-2019 The Apache Software Foundation
 Home page: http://hive.apache.org/