Bug fix: Mark connection as not good when error on cancellation confirmation #773
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This pr fixes bug when we were not able to get cancelation confirmation but connection is not marked as bad and returns to pool, so next time this connection is taken from pool, we get the same error instead of opening new good connection
Example:
r, err := db.QueryContext(ctx, query) <- context expired, then we got cancelation confirmation error
...
r, err := db.QueryContext(ctx, query) <- we get same error because we are still using bad connection instead of opening new one