When DoubleWrite is on, is the query also run twice?

[unix2dos]

Your Question

func (pool ConnPool) QueryContext(ctx context.Context, query string, args ...interface{}) (*sql.Rows, error) {
	ftQuery, stQuery, table, err := pool.sharding.resolve(query, args...)
	if err != nil {
		return nil, err
	}

	pool.sharding.querys.Store("last_query", stQuery)

	if table != "" {
		if r, ok := pool.sharding.configs[table]; ok {
			if r.DoubleWrite {
				pool.ConnPool.ExecContext(ctx, ftQuery, args...)
			}
		}
	}

	return pool.ConnPool.QueryContext(ctx, stQuery, args...)
}

The document you expected this should be explained

Expected answer