8b358b42f8
Seven of the eight other relkind codes are lower-case, so it wasn't consistent for this one to be upper-case. Fix it while we still can. Historical notes: the reason for the lone exception, i.e. sequences being 'S', is that 's' was once used for "special" relations. Also, at one time the partitioned-tables patch used both 'P' and 'p', but that got changed, leaving only a surprising choice behind. This also fixes a couple little bits of technical debt, such as type_sanity.sql not knowing that 'm' is a legal value for relkind. Discussion: https://postgr.es/m/27899.1488909319@sss.pgh.pa.us
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