lwhite1 commented on issue #13721:
URL: https://github.com/apache/arrow/issues/13721#issuecomment-1222418388
Ax far as I know, there is no documentation other than what is in the source
code. A holder is just a clever way to access values in a Vector generically
without boxing every primitive value, and only creating one holder per
ValueVector.
So for example, If you have an IntVector called ageVector, and you want to
add a year to everyone's age, you would create your IntHolder(s) once before
starting your loop, then set its value inside the loop and pass the holder to a
writer.
```
IntVector ageVector = ...
IntHolder ageWriteHolder = new IntHolder();
IntHolder ageReadHolder = new IntHolder();
for (int i = 0; i < ageVector.getRowCount(); i++);
intVector.get(i, ageReadHolder);
ageWriteHolder.value = ageReadHolder.value + 1;
intVector.set(i, ageWriteHolder);
}
```
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