Inaccurate description on limitations on a single column
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@cfzjywxk is already working on this.
Since Jan 4, 2023.
area/transaction
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Description
File: /master/tidb-limitations.md

The description for limitations on a single column is actually the limitations on a single row. Currently, TiDB does not check size limit for a single column by now, and it checks the key and whole value size.
The doc needs update.
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