What's Changed

• [1.9] test stability improvement. by @methane in [1.9] test stability improvement. #1699
• [1.9] Transaction Commit/Rollback returns conn's cached error by @methane in [1.9] Transaction Commit/Rollback returns conn's cached error #1702
• backport benchmark_test by @methane in backport benchmark_test #1706
• [1.9] optimize readPacket (optimize readPacket #1705 ) by @methane in [1.9] optimize readPacket (#1705) #1707
• [1.9] fix PING on compressed connections by @methane in [1.9] fix PING on compressed connections #1723
• release v1.9.3 by @methane in release v1.9.3 #1725

Full Changelog: v1.9.2...v1.9.3