1.[ISSUE #919](https://github.com/sharding-sphere/sharding-sphere/issues/919) Inline expression with groovy may cause memory leak
1.[ISSUE #993](https://github.com/sharding-sphere/sharding-sphere/issues/993) Fail to parsing PostgreSQL due to the quotation
1.[ISSUE #1015](https://github.com/sharding-sphere/sharding-sphere/issues/1015) Support SQL like `SELECT id, COUNT(*) FROM table GROUP BY 1,2`
1.[ISSUE #1186](https://github.com/sharding-sphere/sharding-sphere/issues/1186) Dead lock may occur on MEMORY_STRICTLY mode when get connection on concurrency environment