Also I don’t like the fact that your patch not only removes
GLOB function, but also changes some user-visible interface.
It still would be OK if you wrote about it in commit message
or in doc request. For instance, as I understand from code,
percent symbol (‘%’) now works as star (‘*’) did before.

'*' from GLOB is subject to remove, '%' from LIKE still doing its work.
Comments that use names of symbols from GLOB are changed to use LIKE
syntax.

My bad. Original comments in source code turned out to be

incomplete and misleading a bit.

Finally, to be honest I didn’t review ALL changed tests.
I looked through and they seem to be OK.

I’ve pushed also several non-functional fixes -
see branch np/gh-3251-where-like-hangs.

Don't have objections against your changes.

Let's assume this as formal LGTM.