Was hard to diagnose...
After upgrading a Tiki20 to Tiki21 I was able to rebuilt the index:
[03-03-2020 12:05] Started rebuilding index... logging to file: /var/tmp/Search_Indexer_mysql_tsaharoniki_tiki21_console.log Unified search engine: MySQL, version 5.7.26 error: The search index could not be rebuilt. Expression #1 of ORDER BY clause is not in SELECT list, references column 'tsaharoniki_tiki21.ttif0.value' which is not in SELECT list; this is incompatible with DISTINCT
2020-03-03T10:47:35+02:00 ERR (3): WARNING: PDOStatement::execute(): SQLSTATE[HY000]: General error: 3065 Expression #1 of ORDER BY clause is not in SELECT list, references column 'tsaharoniki_tiki21.tti$
Checking the item (I had to find it!) I found out that having a sort parameter in an itemList field was responsible.
Once removed it worked.
This is very problematic when you have financial data as any report must be ordered (by date).
Same same in Tiki 20
It may be related to the removal of the "split" function in PHP 7+;
It is now also on Tiki18.8 as it was signaled to me by another Tiki user (tested with him)
I tried to reproduce on the show instance but there is a bug with field list on the trackers and it is not possible to recreate the caches.
The URL for the show2.tiki.org instance that demonstrates this bug is at: http://bsfez-11581-7301.show2.tiki.org. Note that if you get a popup asking for a username/password, please just enter "show" and "show". This is different from the initial login and password for a new Tiki which is "admin" and "admin".
For the install log, see http://bsfez-11581-7301.show2.tiki.org/info.txt
Note that if you see PHP errors or a Tiki claiming to be missing third party software, the instance creation is probably not finished. Please wait a couple minutes and reload.
Snapshots are database dumps of the configuration that developers can download for debugging. Once you have reproduced your bug on the show2.tiki.org instance, create a snapshot that can then be downloaded by developers for further investigation.
Snapshots can be accessed at: http://bsfez-11581-7301.show2.tiki.org/snapshots/. Note that if you get a popup asking for a username/password, please just enter "show" and "show".Create new snapshot
To help developers solve the bug, we kindly request that you demonstrate your bug on a show.tikiwiki.org instance. To start, simply select a version and click on "Create show.tikiwiki.org instance". Once the instance is ready (in a minute or two), as indicated in the status window below, you can then access that instance, login (the initial admin username/password is "admin") and configure the Tiki to demonstrate your bug. Priority will be given to bugs that have been demonstrated on show.tikiwiki.org.
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