arina-ielchiieva opened a new pull request #2060: DRILL-7706: Implement Drill RDBMS Metastore URL: https://github.com/apache/drill/pull/2060 # [DRILL-7706](https://issues.apache.org/jira/browse/DRILL-7706): Implement Drill RDBMS Metastore ## Description Currently Drill has only one Metastore implementation based on Iceberg tables. Iceberg tables are file based storage that supports concurrent writes / reads but required to be placed on distributed file system. This PR aims to implement Drill RDBMS Metastore which will store Drill Metastore metadata in the database of the user's choice. Currently, PostgreSQL and MySQL databases are supported, others might work as well but no testing was done. Also out of box for demonstration / testing purposes Drill will setup SQLite file based embedded database but this is only applicable for Drill in embedded mode. 1. Fix issue with undeterministic execution of batch update / delete statements, now they will be executed in the same order as they were added. 2. Abstracted Metastore common test classes to be used by different Metastore implementations. 3. Added drill-metastore-override-example.conf with example of Drill Metastore configuration. 4. Replaced list of metadata types which are required to be passed during read / write operations with set to avoid possible duplicates. 5. Add RDBMS Metastore implementation, README.md and unit tests. ## Documentation RDBMS Metastore section should be added: http://drill.apache.org/docs/using-drill-metastore/ ## Testing Ran all unit tests, Functional & Advanced. Tested manually with SQLite, PostgreSQL, MySQL.
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