Appropriate use of lazy fetching with fetchSize + fetchStream ?

[LMey]

Hi,

I'm not sure I'm using lazy fetching with streams correctly... I'm using 
Jooq 3.9.6 en Postgresql 9.5.

This is my (simplified) repo method :

public Stream<Example> findLazy() {
    return dslContext.select(...)
            .fetchSize(100)
            .fetchStream()
            .map(ExampleMapper::apply);
}


And my service method (running in a transaction) :

try (Stream<Example> stream = exampleRepository.findLazy()) {
    stream.forEach(magic::doStuff);
}


Will this chunk appropriately or load everything into memory ? How does 
this work exactly ? Sadly with postgresql I have not found any way of 
checking if this works.

Thanks

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