presto-main/src/main/java/io/prestosql/operator/ScanFilterAndProjectOperator.java/SplitToPages/processColumnSource
class SplitToPages:        WorkProcessor<Page> processColumnSource()
        {
            return WorkProcessor
                    .create(new RecordCursorToPages(session, yieldSignal, cursorProcessor, types, pageSourceMemoryContext, outputMemoryContext))
                    .yielding(yieldSignal::isSet)
                    .withProcessStateMonitor(state -> memoryContext.setBytes(localAggregatedMemoryContext.getBytes()));
        }