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426ea61117
Make nbtree's "1/3 of a page limit" BTMaxItemSize function-like macro (which accepts a "page" argument) into an object-like macro that can be used from code that doesn't have convenient access to an nbtree page. Preparation for an upcoming patch that adds skip scan to nbtree. Parallel index scans that use skip scan will serialize datums (not just SAOP array subscripts) when scheduling primitive scans. BTMaxItemSize will be used by btestimateparallelscan to determine how much DSM to request. Author: Peter Geoghegan <pg@bowt.ie> Discussion: https://postgr.es/m/CAH2-Wz=H_RG5weNGeUG_TkK87tRBnH9mGCQj6WpM4V4FNWKv2g@mail.gmail.com