On 12/12/2017 04:33 PM, Robert Haas wrote: > you want to upgrade your existing tables to use lz4 rather than pglz, > you can change the compression option for those columns to COMPRESS > lz4 PRESERVE pglz if you want to do it incrementally or just COMPRESS
This is a thread I've only been following peripherally, so forgive a question that's probably covered somewhere upthread: how will this be done? Surely not with compression-type bits in each tuple? By remembering a txid where the compression was changed, and the former algorithm for older txids? -Chap
