Re: [HACKERS] Proposal: collect frequency statistics for arrays
Thanks for feedback on my proposal. Ok, I'll write it as an separate function. After that I'm going to look if is there a way to union them without kluge. If I'll not find such way then I'll propose patch with separate function. -- With best regards, Alexander Korotkov.
[HACKERS] Proposal: collect frequency statistics for arrays
Hackers, I have following proposal. Currently the ts_typanalyze function accumulates frequency statistics for ts_vector using lossy counting technique. But no frequency statistics is collecting over arrays. I'm going to generalize ts_typanalyze to make it collecting statistics for arrays too. ts_typanalyze internally uses lexeme comparison and hashing. I'm going to use functions from default btree and hash opclasses of array element type in this capacity. Collected frequency statistics for arrays can be used for and @ operators selectivity estimation. -- With best regards, Alexander Korotkov.
Re: [HACKERS] Proposal: collect frequency statistics for arrays
Alexander Korotkov aekorot...@gmail.com writes: I have following proposal. Currently the ts_typanalyze function accumulates frequency statistics for ts_vector using lossy counting technique. But no frequency statistics is collecting over arrays. I'm going to generalize ts_typanalyze to make it collecting statistics for arrays too. ts_typanalyze internally uses lexeme comparison and hashing. I'm going to use functions from default btree and hash opclasses of array element type in this capacity. Collected frequency statistics for arrays can be used for and @ operators selectivity estimation. It'd be better to just make a separate function for arrays, instead of trying to kluge ts_typanalyze to the point where it'd cover both cases. regards, tom lane -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
