v0.4.6-nightly

What's Changed

Bug Fixes

• Fix mysql protocol response in serving COM_FIELD_LIST (#620) by @sundy-li
• Fix self build runner cargo dependency errros in Performance test (#618) by @ZhiHanZ
• ISSUES-468 fix infinite loop for Merge Processor (#612) by @zhang2014

Features

• A basic implementation of appending data to store (issue #579) (#587) by @hulunbier

Improvement

• Refactor expressions (#550) by @sundy-li
• support substring function with minus argument (#611) by @b41sh

Others

• Refactor expressions (#550) by @sundy-li