TiFlash has less rows than TiKV

[flowbehappy]

Bug Report

Please answer these questions before submitting your issue. Thanks!

1. Minimal reproduce step (Required)

A use report that TiFlash has less rows than TiKV.

The root cause is that the range of some regions are in illegal format. For example:
table id: 283
start: 7480000000000001FF1B5F728000000000FF11BDC00000000000FA
end: 7480000000000001FF1B5F728000000000FF11BDC00000000000FB

We don't know how the data is ingested into TiFlash. But we need to make some checks on TiFlash side to prevent data lost.

2. What did you expect to see? (Required)

3. What did you see instead (Required)

4. What is your TiFlash version? (Required)

[breezewish]

Removed affect-6.6 ~ affect-7.1, since the check is already there for these versions.

[CalvinNeo]

It may panic like

Detected illegal region boundary:

and

Check compare(range.getStart(), ext_file.range.getStart()) <= 0 && compare(range.getEnd(), ext_file.range.getEnd()) >= 0

It is fixed on TiFlash 7.1.2/6.5.4