Rows read measure how many rows a query reads (scans), regardless of the size of each row. For example, if you have a table with 5000 rows and run a SELECT * FROM table as a full table scan, this would count as 5,000 rows read. A query that filters on an unindexed column may return fewer rows to your Worker, but is still required to read (scan) more rows to determine which subset to return.
是不是频繁全表扫描的问题？
