Hey there! I was running SQL queries via PySpark (using the wmfdata package <https://github.com/neilpquinn/wmfdata/blob/master/wmfdata/hive.py>) on SWAP when one of my queries failed with "java.lang.OutofMemoryError: Java heap space". After that, when I tried to call the spark.sql function again (via wmfdata.hive.run), it failed with "java.lang.IllegalStateException: Cannot call methods on a stopped SparkContext." When I tried to create a new Spark context using SparkSession.builder.getOrCreate (whether using wmfdata.spark.get_session or directly), it returned a SparkContent object properly, but calling the object's sql function still gave the "stopped SparkContext error". Any idea what's going on? I assume restarting the notebook kernel would take care of the problem, but it seems like there has to be a better way to recover. Thank you!