Overview of Changes

[IMPORTANT] This version includes a backward incompatible file format change for YSQL. This means that if you have an existing cluster with
YSQL schema, then you will not be able to connect to the YSQL database after upgrading to v1.3.0. There are two ways to work around this problem:

• If you don't care about preserving your existing data, then you can delete your older cluster, upgrade to v1.3.0 and create a new cluster.
• If you want to continue using your existing data, then please save your older data (in the form of SQL statements), delete the older cluster, upgrade to v1.3.0, create a new cluster and then load the previously saved data.

YSQL Changes

• [YSQL] Enable DO statements (a.k.a anonymous blocks).#1656
• [YSQL] Fix transaction read restart logic causing stale reads and lost writes.#1646
• [YSQL] Enable beta-features by default.#1639
• [YSQL] Fix value overwrite check in REPEATABLE READ isolation mode in YSQL.#1577
• [YSQL] Allow SELECT from sequences.#999
• [YSQL] Avoid auto-retrying non-DML requests.#1333
• [YSQL] Set the read point correctly at REPEATABLE READ isolation when turning a read-only transaction into a read-write one.
• [YSQL] Add new key column ybindexkeysuffix to YSQL index table [format change].#1058
• [YSQL] Add support for setval().#1003
• [YSQL] YSQL catalog cache consistency checking via tablet server shared memory.#1457
• [YSQL] Fix persistence issue with catalog version.#1629

YCQL Changes

• Added built-in function toJson() for YCQL SELECT statement.#992

System Improvements

• Add Master UI page for tracking async tasks.#1145
• Use rw_spinlock in meta cache to decrease lock contention.#1667
• Change default maximum per-tablet RPC batch size to 32mb.#1440
• Fix for flushing old tablets based on memory usage.#1672
• Replaced OS_LINUX with linux for ifdefs.#1711
• Unified yb::SequentialFile and rocksdb::SequentialFile.#1661
• Add a compact_table command to yb-admin.#1735
• Automatically filter out YSQL sys catalog tables from YBClient calls.#1537
• Add TLS support to java yb-client.
• Allow pausing a compaction when another compaction with a higher priority is scheduled.#1314
• Fixed Tablet::Truncate to re-enable auto compactions.1765
• Fix race condition in PriorityThreadPool.#1775