remove tmp buf from table_scan #16969
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What type of PR is this?
Which issue(s) this PR fixes:
issue #14940
What this PR does / why we need it:
这个原来是因为有时reader返回的数据量较小，使得可以上范围锁的变成上点锁。容易造成点锁数量较大时加的。
现在一个是没有范围锁了，另外当点锁太大会转表锁，这部分逻辑应该没有必要存在了，徒增复杂度。