presto-main/src/main/java/io/prestosql/connector/informationschema/InformationSchemaPageSource.java/InformationSchemaPageSource/flushPageBuilder
class InformationSchemaPageSource:    private void flushPageBuilder()
    {
        if (!pageBuilder.isEmpty()) {
            pages.add(pageBuilder.build());
            memoryUsageBytes += pageBuilder.getRetainedSizeInBytes();
            pageBuilder.reset();
        }
    }