Interesting difference between SQL and Lucene search

[AbleMods]

I noticed this week an interesting behavior while testing Able search:

Assume a keywords field contains the following:
Joe,Judy, Mike, Katie

Take special note of spaces and commas

With Lucene enabled, a search for Judy or Joe will not work. Searching for Mike or Katie will. It appears the space between keywords is necessary.

Whereas with SQL FTS, I can find any of the four names.

I don't recall any discussions that the keywords field must be adapted to the appropriate search engine provider configured in the store.

Is this behavior intended?