switch s3Select.Output.format {
	case csvFormat:
		// Use bufio Writer to prevent csv.Writer from allocating a new buffer.
		bufioWriter := bufioWriterPool.Get().(*bufio.Writer)
		defer func() {
			bufioWriter.Reset(xioutil.Discard)
			bufioWriterPool.Put(bufioWriter)
		}()

		bufioWriter.Reset(buf)
		opts := sql.WriteCSVOpts{
			FieldDelimiter: []rune(s3Select.Output.CSVArgs.FieldDelimiter)[0],

}
func putCopyBuf(b []byte) {
	if len(b) != copyBufPoolSize {
		panic("trying to put back buffer of the wrong size in the copyBufPool")
	}
	copyBufPool.Put((*[copyBufPoolSize]byte)(b))
}

func bufioWriterPool(size int) *sync.Pool {
	switch size {
	case 2 << 10:
		return &bufioWriter2kPool
	case 4 << 10:
		return &bufioWriter4kPool
	}
	return nil
}

// newBufioReader should be an internal detail,