Current master is still at Spark 0.9.x . MAHOUT-1603 (PR #40) is making a number of valuable tweaks to enable Spark 1.0.x and (Spark SQL code, by extension. I did a quick test, SQL seems to work for my simple tests in Mahout environment).
This squashed PR is pushed to apache/mahout branch spark-1.0.x rather than master. Whenever (if) folks are ready, i can merge it to the master. Alternative approach would be to maintain both 1.0.x and 0.9.x branches for some time. I don't see it as valuable as the costs would likely overrun any benefit here, but if anyone still clings to spark 0.9.x dependency, please let me know in this thread. thanks. -d
