> The users will be able to define statistics with the limitation that > only a single one (the one covering the most columns referenced by the > clauses) can be used when estimating a query. Which is not perfect, > but I think it's a valuable improvement. > > It might also be possible to split 0006 into smaller pieces, for > example implementing the "non-overlapping statistics" case first and > then extending it to more complicated cases. That might increase the > change of getting at least some of that into 9.6 ... > > But considering it's not clear whether the initial chunks are likely > to make it into 9.6 - I kinda expect a fair amount of comments from TL > about the preceding parts, who mentioned he might look at the patch > this week. So I'm not sure splitting 0006 into smaller pieces makes > sense at this point.
Thanks for the explanation. I will look into patch 0001 to 0005 so that they could get into 9.6. In the mean time after applying patch 0001 to 0005 of v16, I get this while compiling SGML docs. openjade:ref/create_statistics.sgml:281:26:X: reference to non-existent ID "SQL-ALTERSTATISTICS" openjade:ref/drop_statistics.sgml:86:26:X: reference to non-existent ID "SQL-ALTERSTATISTICS" Best regards, -- Tatsuo Ishii SRA OSS, Inc. Japan English: http://www.sraoss.co.jp/index_en.php Japanese:http://www.sraoss.co.jp -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
