Comments (2)
I think projection with map(select("col1", "col2"))
could wait until the next release or could be in the enterprise version
from jpa-streamer.
Projection should be provided according to the example below:
jpaStreamer.stream(sc)
.sorted(Film$.length.reversed())
.limit(15)
.map(Projection.select(Film$.filmId, Film$.title))
.map((Tuple t) -> String.format("filmId: %d, title: %s ", t.get(0), t.get(1, String.class)))
.forEach(System.out::println);
Thus, Projection.select(...)
would return a Function<Film, Tuple>
containing sufficient meta-data to be able to extract the columns needed.
This work item only involves pure columns and thus no expressions with columns.
The mapping of columns could take place in several places in the example above: Before or after limit()
. It cannot, however, take place before sorted because Tuple
it not of type Film
wich the sorted(Film$.length.reversed())
statement assumes.
mapToInt()
etc. is in a separate issue #44.
from jpa-streamer.
Related Issues (20)
- resetStreamer() does not close the underlying Entity Manager HOT 1
- Fieldgenerator yeilds ReferenceField instead of ComparableField HOT 2
- Fieldgenerator should not accept private getter HOT 2
- Illegal reuse of criteria for count()-operator HOT 1
- Merger applies all limit()-operators HOT 1
- Merger should only apply limits under certain conditions HOT 2
- Interopoptimizer should only squash adjacent filters and sorts that uses the JPAStreamer metamodel
- Cannot generate $ icon files under annotations folder of generated-sources HOT 4
- Metamodel classes not generated properly when using hibernate validator with quarkus HOT 4
- Add support for toList()
- Add support for mapMulti()
- Support Virtual Thread HOT 1
- jdk 17 support HOT 1
- Filter is not applied in the "where" clause HOT 2
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- Java 21 support
- JPAStreamer filter does not work with Hibernate 6.3 or later HOT 4
- Code generator: Include fields from multiple level parent classes
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- Filter based on SubEntity (ManyToOne relation) HOT 1
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from jpa-streamer.