Pushed this. I noticed that the paragraph that described MERGE in the read-committed subsection had been put in the middle of some other paras that describe interactions with other transactions, so I moved it up so that it appears together with all the other paras that describe the behavior of specific commands, which is where I believe it belongs.
Thanks! -- Álvaro Herrera PostgreSQL Developer — https://www.EnterpriseDB.com/ Thou shalt study thy libraries and strive not to reinvent them without cause, that thy code may be short and readable and thy days pleasant and productive. (7th Commandment for C Programmers)
