Created attachment 165612 [details] test ODS file with autofilter Assume a column contains n items. When we open the autofilter and un-selected one, then we have n-1 items selected. Doing this filter with AutoFilter is slow because it seems to be using the "x in n-1" logic. However, doing this filter with Standard Filter is fast if we use "Not Equal" logic. Steps to Reproduce: 1. Open the attached test ODS file 2. Click the autofilter in column A, and de-select the 1st item (i.e., #N/A), then click OK. --> Slow, it takes more than 8s. 3. Use Standard Filter, and set condition "POMatch <> #N/A", then click OK. --> Fast, it takes 1s. Apparently, if we deselect only one item, the condition is the same as <> that item. It should be more expensive to compare the value to see whether it is in the n-1 list. Actually, if we de-select several items (e.g., 3 items), it would still be faster to use "(x <> a) and (x <> b) and (x <> c)". However, if the deselected items are quite a lot, the "x in n-1" logic should be faster.
*** This bug has been marked as a duplicate of bug 133835 ***
Created attachment 176404 [details] Another test ods file Deselecting autofilter items in columns O, P, S will freeze Calc as there are many unique values in these columns.
Luboš Luňák committed a patch related to this issue. It has been pushed to "master": https://git.libreoffice.org/core/commit/7b0aabe71d2455f6f643553a07f1056935cf190f sort, cache and binary search query items if they're many (tdf#136838) It will be available in 7.3.0. The patch should be included in the daily builds available at https://dev-builds.libreoffice.org/daily/ in the next 24-48 hours. More information about daily builds can be found at: https://wiki.documentfoundation.org/Testing_Daily_Builds Affected users are encouraged to test the fix and report feedback.