[Koha] Title search caching oddity

[Barton Chittenden]

I've been working with one of our partner libraries trying to explain the
difference between title search by phrase and title keyword search the
example that he gave me was

    ti,phr: Little Women

This returned 39 results. Running the same search without using 'phr'

    ti: Little Women

yielded the same 39 results.

After poking around at all of the possible marc fields indexed as title, I
determined that there were indeed exactly 39 records containing the exact
string "Little Women" -- it struck me as odd that there would not be more
results in the keyword search... so I reversed the search terms:

    ti: Women Little returned 110 results

and

   ti,phr: Women LIttle

returned none. This is more like what I expected.

I went to file this as a bug, and on my next pass through, the keyword
search for 'LIttle Women' (in the original order) returned 110 results.

It's obvious that there's some sort of caching going on, but I have no idea
where.