presto-main/src/main/java/io/prestosql/operator/TableScanWorkProcessorOperator.java/TableScanWorkProcessorOperator/ConnectorPageSourceToPages
class TableScanWorkProcessorOperator:        ConnectorPageSourceToPages(AggregatedMemoryContext aggregatedMemoryContext, ConnectorPageSource pageSource)
        {
            this.pageSource = pageSource;
            this.memoryContext = aggregatedMemoryContext
                    .newLocalMemoryContext(TableScanWorkProcessorOperator.class.getSimpleName());
        }