Aditya Manthramurthy 91c839ad28 Use a buffer to collect SQL Select result rows (#7158)
Batching records into a single SQL Select message in the response
leads to significant speed up as the message header overhead is made
negligible.

This change leads to a speed up of 3-5x for queries that select many
small records.
2019-01-28 20:00:18 -08:00
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