v1.5.4

What's Changed

• Feature/issue 578 refine proton exit by @yokofly in #587
• fix build failure on MacOS by @yl-lisen in #595
• clear invalid checkpoint directories by @yl-lisen in #596
• Fix external stream provision null context access by @chenziliang in #604
• streaming processing supports nullable datatype by @lizhou1111 in #594
• Enhancement/issue 590 improve the fault tolerance of materialized view by @yl-lisen in #597
• Feature/kafka properties for source by @zliang-min in #618
• Ugly hotfix for "terminate on uncaught exception" in WriteBufferFromO… by @yokofly in #622
• bugfix: properly quote CH table name for SELECT queries. by @zliang-min in #624
• feature: select message key from kafka external stream by @zliang-min in #625

Full Changelog: v1.5.3...v1.5.4