presto-main/src/main/java/io/prestosql/sql/planner/LocalExecutionPlanner.java/LocalExecutionPlanContext/createIndexSourceSubContext
class LocalExecutionPlanContext:        public LocalExecutionPlanContext createIndexSourceSubContext(IndexSourceContext indexSourceContext)
        {
            return new LocalExecutionPlanContext(taskContext, types, driverFactories, Optional.of(indexSourceContext), dynamicFiltersCollector, nextPipelineId);
        }