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From: =?utf-8?Q?Erik_F=C3=A4=C3=9Fler?= <erik.faessler@uni-jena.de>
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Subject: Performance of UIMAfit JCasUtil.selectCovered() and variants
Message-Id: <07371163-1101-4350-93DB-849B272935C6@uni-jena.de>
Date: Wed, 21 Oct 2015 17:07:17 +0200
To: user@uima.apache.org
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Hi all,

I=E2=80=99m wondering about the performance differences between

1) JCasUtil.selectCovered(JCas, Class<T>, AnnotationFS),
2) JCasUtil.selectCovered(JCas, Class<T>, int, int) and
3) JCasUtil.indexCovered(JCas, Class<T>, Class<S>)

It is clear that 3) iterates once through the CAS and just returns a =
map. Once this is done, map access is swift.

The Javadoc of 2) states that it is slower than 1).
3) states that it is preferable to 2).

Questions:
Is 3) also preferable over 2) when there is only one covering annotation =
or is the performance of 2) and 3) roughly equal then?
Main question: Is 3) also quicker than 1) if there are many covering =
annotations?

Use case: I want to iterate through all sentences in paragraphs. =
Normally, I would use subiterators(), but the known type priority issue =
could be a problem for me. Should I just use 1)? Or would I still =
benefit from 3) if I have more than one paragraph?

Thank you very much!

Best,

Erik=