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6b769d011d
Adds a bounded query-result cache that clients can enable by setting an 'impala.resultset.cache.size' option in the HS2 confOverlay mapof the HS2 exec request. Impala permits FETCH_FIRST for a particular stmt iff result caching is enabled. FETCH_FIRST will succeed as long all previously fetched rows fit into the bounded result cache. Regardless of whether a FETCH_FIRST succeeds or not, clients may always resume fetching with FETCH_NEXT. The FETCH_FIRST feature is intended to allow HUE users to export an entire result set (to Excel, CSV, etc.) after browsing through a few pages of results, without having ro re-run the query from scratch. Change-Id: I71ab4794ddef30842594c5e1f7bc94724d6ce89f Reviewed-on: http://gerrit.ent.cloudera.com:8080/1356 Reviewed-by: Alex Behm <alex.behm@cloudera.com> Tested-by: jenkins Reviewed-on: http://gerrit.ent.cloudera.com:8080/1406