Unify Hive's MOR implementations to avoid duplication to avoid duplication across implementations for different file-formats (Parquet, HFile, etc)
- Extracted HoodieRealtimeFileInputFormatBase (extending COW HoodieFileInputFormatBase base)
- Rebased Parquet, HFile implementations onto HoodieRealtimeFileInputFormatBase
- Tidying up
Refactoring layout optimization (clustering) flow to
- Enable support for linear (lexicographic) ordering as one of the ordering strategies (along w/ Z-order, Hilbert)
- Reconcile Layout Optimization and Clustering configuration to be more congruent
To modify SQL statement for creating hudi table based on an existing hudi path.
From:
```sql
create table hudi_tbl using hudi tblproperties (primaryKey='id', preCombineField='ts', type='cow') partitioned by (pt) location '/path/to/hudi'
```
To:
```sql
create table hudi_tbl using hudi location '/path/to/hudi'
```
* Introduce hudi-spark3-common and hudi-spark2-common modules to place classes that would be reused in different spark versions, also introduce hudi-spark3.1.x to support spark 3.1.x.
* Introduce hudi format under hudi-spark2, hudi-spark3, hudi-spark3.1.x modules and change the hudi format in original hudi-spark module to hudi_v1 format.
* Manually tested on Spark 3.1.2 and Spark 3.2.0 SQL.
* Added a README.md file under hudi-spark-datasource module.
* [HUDI-2909] Handle logical type in TimestampBasedKeyGenerator
Timestampbased key generator was returning diff values for row writer and non row writer path. this patch fixes it and is guarded by a config flag (`hoodie.datasource.write.keygenerator.consistent.logical.timestamp.enabled`)
* [HUDI-2154] Add index key field to HoodieKey
* [HUDI-2157] Add the bucket index and its read/write implemention of Spark engine.
* revert HUDI-2154 add index key field to HoodieKey
* fix all comments and introduce a new tricky way to get index key at runtime
support double insert for bucket index
* revert spark read optimizer based on bucket index
* add the storage layout
* index tag, hash function and add ut
* fix ut
* address partial comments
* Code review feedback
* add layout config and docs
* fix ut
* rename hoodie.layout and rebase master
Co-authored-by: Vinoth Chandar <vinoth@apache.org>
