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4527f51e7c
This patch changes INSERTs into compressed chunks to no longer be immediately compressed but stored in the uncompressed chunk instead and later merged with the compressed chunk by a separate job. This greatly simplifies the INSERT-codepath as we no longer have to rewrite the target of INSERTs and on-the-fly compress leading to a roughly 2x improvement on INSERT rate into compressed chunk. Additionally this improves TRIGGER-support for INSERTs into compressed chunks. This is a necessary refactoring to allow UPSERT/UPDATE/DELETE on compressed chunks in follow-patches.