This patch lets you control 3 pg_lzcompress knobs on a per table basis (note requires reloptions.patch)
compress_max_size: Controls the maximum size to be considered for TOAST compression. compress_min_rate: Minimum compression rate (0-100%) required for TOAST compression to be used. compress_success_by: if by this byte no compressible data found abort compression. Note this adds some documentation, but I was having a hard time coming up with a good way to describe these. I'm also not very happy with the names. I originally tried something like toast.max_input_size. But decided later if we allow you to set toast attributes that might be confusing. So help with verbiage and names is appreciated. Also I only did those 3 because they seemed the 3 most useful things someone would want to tune. Later if we need to we can export them all and make them per column settings (and maybe you can pick a compression algo or what not...) But I figured lets start small. I thought about doing another cleanup patch to get rid of PGLZ_Strategy_default and PGLZ_Strategy_always. Nothing uses the later, and if we expose all the nobs nothing will use the first. Comments?
compress_opts.patch
Description: Binary data
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