Upgrade to Airbase 30 and Airlift 0.99-SNAPSHOT
Convert CLI to java.util.Optional
Convert Kafka plugin to java.util.Optional
Convert verifier to java.util.Optional
Convert tests to java.util.Optional
Convert Hive plugin to java.util.Optional
Convert aggregations to java.util.Optional
Convert presto-main to use java.util.Optional
Fix nondeterministic failures in approx_distinct tests