tree 852f8e40e2f992949dce60e654063abe34e831b8
parent a2c94127b9a5c48d96039ef35b618cd64f343b1d
author Ali Alsuliman <ali.al.solaiman@gmail.com> 1556653542 -0700
committer Ali Alsuliman <ali.al.solaiman@gmail.com> 1556729933 +0000

[ASTERIXDB-2552][RT] Implement micro external sort for subplans

- user model changes: no
- storage format changes: no
- interface changes: no

Details:
This patch is to change the in memory sort used in subplans to
be a micro external sort to avoid out of memory error.

- added reset() to the runs merger to allow reusing the runs merger.
- renamed "InMemoryStableSortPOperator" to "MicroStableSortPOperator".
- changed the tag from "IN_MEMORY_STABLE_SORT" to "MICRO_STABLE_SORT".
- added test cases.

Change-Id: I930849d644c60d461d2869c9773b85e49b46fbdb
Reviewed-on: https://asterix-gerrit.ics.uci.edu/3353
Contrib: Jenkins <jenkins@fulliautomatix.ics.uci.edu>
Integration-Tests: Jenkins <jenkins@fulliautomatix.ics.uci.edu>
Tested-by: Jenkins <jenkins@fulliautomatix.ics.uci.edu>
Reviewed-by: Dmitry Lychagin <dmitry.lychagin@couchbase.com>