[greenlet]

how does mysql's json type compare to postgres' jsonb? my biggest gripe with both of them is lack of partial update

[morgo]

No partial update yet, but we are working towards it -

The json binary format spec allows for padding. Search in page for 'BLOB' for details: http://mysqlserverteam.com/the-mysql-8-0-0-milestone-release...

[Psyonic]

jsonb_set is available now in postgres 9.5: https://www.postgresql.org/docs/9.5/static/functions-json.ht...

[th3sly]

but that's not partial update. this will update the entire document(blob).

[semiquaver]

Postgres' MVCC architecture makes the idea of 'partial updates' kind of meaningless. An update to any postgres column is equivalent to a DELETE followed by an INSERT and will result in a new row on disk, leaving the old row to be vacuumed later.

[morgo]

Just to clarify: s/architecture/implementation/

InnoDB is MVCC too, but does an update in place with relocation of the old row to UNDO space. There are pros and cons to both approaches.