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Tom Lane
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to be just a minor extension of the previous patch that made "x IS NULL" indexable, because we can treat the IS NOT NULL condition as if it were "x < NULL" or "x > NULL" (depending on the index's NULLS FIRST/LAST option), just like IS NULL is treated like "x = NULL". Aside from any possible usefulness in its own right, this is an important improvement for index-optimized MAX/MIN aggregates: it is now reliably possible to get a column's min or max value cheaply, even when there are a lot of nulls cluttering the interesting end of the index.
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Makefile | ||
README | ||
gist.c | ||
gistget.c | ||
gistproc.c | ||
gistscan.c | ||
gistsplit.c | ||
gistutil.c | ||
gistvacuum.c | ||
gistxlog.c |