Apachge Ignite SQL 是否支持 MERGE WHEN？

Question

Apache Ignite SQL 支持 MERGE 语句。这种支持是否扩展到 MERGE WHEN（例如在 H2 中）？例如

 MERGE INTO account (client_id, tran_ccy, last_tran_dt)
  (SELECT DISTINCT client_id, tran_ccy, Max(tran_dt) 
   FROM transaction
   GROUP BY client_id, tran_ccy)
 WHEN MATCHED THEN 
   UPDATE SET last_tran_dt = tran_dt
 WHEN NOT MATCHED THEN
   INSERT (client_id, tran_ccy, last_tran_dt)
   VALUES (client_id, tran_ccy, tran_dt)

Answer 1

据我所知，Ignite 仅支持来自 H2 的简单 MERGE，没有 USING 语句。这是简单形式 http://www.h2database.com/html/commands.html#merge. It's also described here https://apacheignite-sql.readme.io/docs/merge.

的语法

Apachge Ignite SQL 是否支持 MERGE WHEN？

Does Apachge Ignite SQL support MERGE WHEN?

sql

ignite