Thanks @Aklapper

Yes, I meant commenting custom namespace in LocalSettings.php so it is not the case. As I said earlier in this thread, yes this table name is used only in test cases and doesn't exist.

Are you sure it is because of custom namespace? Can you temporarily disable it and test again? I believe custom namespace is irrelevant.

Any update yet.

I also searched files, and the only places contains temp_rev_comment are the followings. This is strange because these are just TestCase files, not core files, so why this error happens? Also there is no such file while the TestCase exists: /includes/Revision/RevisionQueryInfo.php

I updated to 1.34.1 and the problem still exists. I see the database has no 'temp_rev_comment' table. It seems there is a typo somewhere in codes. Please ping/call a developper to see this bug report.

This is 1.34.0, where is changelog of 1.34.1 that we can check this is fixed?

I did run:
$ php searchUpdateindex.php (under maintenance folder)
and I got this in screen: