Change the csv log to 'key:value' to facilitate the user to understanding and processing of logs

Dear Hackers

When I audit the Postgresql database recently, I found that after configuring the log type as csv, the output log content is as follows: "database ""lp_db1"" does not exist",,,,,"DROP DATABASE lp_db1;",,"dropdb, dbcommands.c:841","","client backend",,0 It is very inconvenient to understand the real meaning of each field. And in the log content，" is escaped as "", which is not friendly to regular expression matching. Therefore, I want to modify the csv log function, change its format to key:value, assign the content of the non-existing field to NULL, and at the same time, " will be escaped as \" in the log content. After the modification, the above log format is as follows: Log_time:"2022-03-15 09:17:55.289 CST",User_name:"postgres",Database_name:"lp_db",Process_id:"17995",Remote_host:"192.168.88.130",Remote_port:"38402",Line_number: "622fe941.464b",PS_display:"DROP DATABASE",Session_start_timestamp:"2022-03-15 09:17:53 CST",Virtual_transaction_id:"3/2",Transaction_id:"NULL",Error_severity:"ERROR",SQL_state_code :"3D000",Errmessage:"database \"lp_db1\" does not exist",Errdetail:"NULL",Errhint:"NULL",Internal_query:"NULL",Internal_pos:"0",Errcontext:"NULL",User_query :"DROP DATABASE lp_db1;",Cursorpos:"NULL",File_location:"dropdb, dbcommands.c:841",Application_name:"NULL",Backend_type:"client backend",Leader_PID:"0",Query_id:"0"

Regards,

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-lupeng