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Comment: Added note about known bugs

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The most common use of the SCS is within a VO client, such as TOPCAT.

Known Issues

9-Jun-2020: BIGINT columns may be truncated.

Although defined as BIGINT, such columns are, when used in a TAP query, limited to INT (-2147483648 to +2147483647) values. This means that if you SELECT or SUM a column who's individual or resulting value exceeds this, the result will either be empty or will max out at +2147483647. This most heavily affects:

A fix for this issue is being investigated by the downstream tools developers.