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These support functions will transform expressions with constant range values into direct comparisons on the range bound values, which are frequently better-optimizable. The transformation is skipped however if it would require double evaluation of a volatile or expensive element expression. Along the way, add the range opfamily OID to range typcache entries, since load_rangetype_info has to compute that anyway and it seems silly to duplicate the work later. Kim Johan Andersson and Jian He, reviewed by Laurenz Albe Discussion: https://postgr.es/m/94f64d1f-b8c0-b0c5-98bc-0793a34e0851@kimmet.dk