cop: Fix float_str_to_int_str bugs and refactor it as same as TiDB #5133
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What have you changed? (mandatory)
Fix some bugs
6.01e-1
->0
-0.0
->-0
(TiDB version is0
)Refactor the impl to make it the same as TiDB version(pingcap/tidb#11376) .
The origin impl is very different from TiDB version, so it is hard for the maintainer to find the difference between them, and it is hard to verify whether they as the same after TiDB change some code of it.
What are the type of the changes? (mandatory)
The currently defined types are listed below, please pick one of the types for this PR by removing the others:
How has this PR been tested? (mandatory)
Does this PR affect documentation (docs) or release note? (mandatory)
No
Does this PR affect tidb-ansible update? (mandatory)
No