Github user Ben-Zvi commented on a diff in the pull request: https://github.com/apache/drill/pull/901#discussion_r132806694 --- Diff: exec/vector/src/main/java/org/apache/drill/exec/vector/BaseValueVector.java --- @@ -133,5 +134,21 @@ public static boolean checkBufRefs(final ValueVector vv) { public BufferAllocator getAllocator() { return allocator; } + + public static void fillBitsVector(UInt1Vector bits, int valueCount) { + + // Create a new bits vector, all values non-null + + bits.allocateNew(valueCount); + UInt1Vector.Mutator bitsMutator = bits.getMutator(); + for (int i = 0; i < valueCount; i++) { + bitsMutator.set(i, 1); + } --- End diff -- This loop may be a bit expensive; Is there a way to mark the whole bitmap with '1's "at once" ? A la "memset()". For example, keep a constant bitmap (of max length - 64K) someplace, and here just dup/copy it whole.
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