manage TDS_DATA_COLUMNSTATUS in ValueReader #235
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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:
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.