You can use the approach in the test suite: https://github.com/apache/arrow/blob/a2ead2f646baad78de01fcb1b90f710fa1eae70b/java/vector/src/test/java/org/apache/arrow/vector/TestValueVector.java#L289
If the Java folks have some other recommendations, I'll let them chime in. - Wes On Tue, Jan 3, 2017 at 6:42 PM, Li Jin <ice.xell...@gmail.com> wrote: > To answer myself: the above doesn't work because mutator doesn't update > writerIndex (only ArrowBuf.writeXXX does). > > Still wondering if there is a good way of setting validity map in Java? > > Li > > On Tue, Jan 3, 2017 at 5:11 PM, Li Jin <ice.xell...@gmail.com> wrote: > >> Hi, >> >> I am working on a function where I want to create an arrow record batch >> from Spark dataset. I am curious what's the best way to create validity >> bitmap buffer for a field? >> >> I found BitVector which has a mutator >> <https://github.com/apache/arrow/blob/master/java/vector/src/main/java/org/apache/arrow/vector/BitVector.java#L425> >> that >> seems to do the thing I want, I am wondering should I: >> >> (1) create a BitVector >> (2) set the value in the BitVector using the mutator >> (3) pass the ArrowBuf from the BitVector >> <https://github.com/apache/arrow/blob/45ed7e7a36fb2a69de468c41132b6b3bbd270c92/java/vector/src/main/java/org/apache/arrow/vector/BaseDataValueVector.java#L116> >> to >> the record batch? >> >> Thanks, >> Li >>
