58d3283b67
This text left one with the impression that an ON SELECT rule could be attached to a plain table, which has not been true since commit 264c06820 (meaning the text was already misleading when written, evidently by me in 96bd67f61). However, it didn't get really bad until b23cd185f removed the convert-a-table-to-a-view logic, which had made it possible for scripts that thought they were attaching ON SELECTs to tables to still work. Rewrite into a form that makes it clear that an ON SELECT rule is better regarded as an implementation detail of a view. Pre-v16, point out that adding ON SELECT to a table actually converts it to a view. Per bug #18178 from Joshua Uyehara. Back-patch to all supported branches. Discussion: https://postgr.es/m/18178-05534d7064044d2d@postgresql.org
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