* NULL red col0 data is empty string if we un-set NULL property
*/
// nulls possible on left, right
batch = makeStringBatchForColColCompare();
expr = new StringGroupColLessStringGroupColumn(0, 1, 3);
expr.evaluate(batch);
Assert.assertEquals(4, batch.size);
outVector = ((LongColumnVector) batch.cols[3]).vector;
Assert.assertFalse(batch.cols[3].isNull[0]);
Assert.assertEquals(1, outVector[0]);