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3 Commits

Author SHA1 Message Date
Aditya Manthramurthy
fd4e15c116 Flush the records staging buffer periodically (#7193) 
- Staging buffer is flushed every 500ms. In cases where the result
  records are slowly generated (e.g. when a where condition
  matches very few records), this change causes the server to send
  results even though the staging buffer is not full.

- Refactor messageWriter code to use simpler channel based
  co-ordination instead of atomic variables.
 2019-02-06 16:03:05 +05:30
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
Bala FA
b0deea27df Refactor s3select to support parquet. (#7023) 
Also handle pretty formatted JSON documents.
 2019-01-08 16:53:04 -08:00