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manage TDS_DATA_COLUMNSTATUS in ValueReader #235

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@tangocoder tangocoder commented Feb 5, 2025

This PR add a basic management for TDS_DATA_COLUMNSTATUS capability in ValueReader.

Context:
I discovered an issue connecting to a Sybase IQ database, trying to execute a select statement and read the results.
and after debugging, and reading TDS protocol specifications:

if the TDS_DATA_COLUMNSTATUS request capability is enabled, then all datatype representations begin with a status byte.

the format token sent by server has TDS_ROW_COLUMNSTATUS flag in RowStatus for string fields,
not reading this status byte causes stream read errors.

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