presto-thrift/src/main/java/io/prestosql/plugin/thrift/ThriftIndexPageSource.java/ThriftIndexPageSource/RunningSplitContext
class ThriftIndexPageSource:        public RunningSplitContext(PrestoThriftService client, PrestoThriftSplit split)
        {
            this.client = client;
            this.split = split;
        }