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Now that name comparison has effectively the same behavior as text comparison, we might as well merge the name_ops opfamily into text_ops, allowing cross-type comparisons to be processed without forcing a datatype coercion first. We need do little more than add cross-type operators to make the opfamily complete, and fix one or two places in the planner that assumed text_ops was a single-datatype opfamily. I chose to unify hash name_ops into hash text_ops as well, since the types have compatible hashing semantics. This allows marking the new cross-type equality operators as oprcanhash. (Note: this doesn't remove the name_ops opclasses, so there's no breakage of index definitions. Those opclasses are just reparented into the text_ops opfamily.) Discussion: https://postgr.es/m/15938.1544377821@sss.pgh.pa.us
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