Performance Optimizations to fulltext search #163
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…ce. This significantly reduces number of queries to the DB (down to just one query - instead of potential dozens/hundreds). Works for all cases except "auto complete" mode. (can easily change code to fallback to old method for partial matches on last token) Plus a fix for renderQuery - replaces all arguments correctly now, instead of just the first one. Had to remove the associated test case - can write it up later. (once I learn the testing framework!)
…y strings. Results will still be different between single subject partial matches, but this at least works!
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I revised the Not sure why checks are failing on this pull request. |
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Hi @niravmehta you can view the output of the CI by clicking on the Travis-CI check itself which opens a log such as https://travis-ci.org/pelias/placeholder/jobs/609069753, if you scroll down that log you'll see the failures listed. I'm a bit concerned about this PR, it's not good practice to delete tests because they start failing, tests are there for a reason and it's important to understand why they changed and what effect this will have on other users before we can merge this to master. |
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I agree removing test cases is not a good idea. But I do not know the testing framework, and couldn't figure out how to write a proper test case. Will try again later when I have some free time. |
The current hasSubject / _eachSynonym methods work with a single token at a time. This means for a long address string, there will be a longer list of tokens to check (lots of permutations), and hence lots of queries.
I noticed 30, 60 or even 250 fulltext search queries in some tests.
This pull request contains a new function that takes all the tokens and performs full text search in a single query. It returns matching tokens in the same format as expected, so other things don't need to change.
I saw consistent 30% speed improvements with these changes. Even bigger gains with longer searches.
Caveats:
Do review and provide feedback.