tree b6383ad30f3d1360b46f363d7d34dac3f976ed48
parent adfb63361a1808aadb1782aee03acc4d9af8eb0c
author Ali Alsuliman <ali.al.solaiman@gmail.com> 1539638227 -0700
committer Ali Alsuliman <ali.al.solaiman@gmail.com> 1539663464 -0700

[ASTERIXDB-2286][COMP][FUN][HYR] Parallel Sort Optimization

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

details:
- new plan for sort operation which includes sampling and
replicating the stream of data to be sorted. Sort-merge connector
is removed from the plan. The sorted result now is in multiple partitions.
- new optimization rule to check whether full parallel sort is applicable.
- new Forward operator to read the replicated sort input stream and
to receive the ouput of the sampling.
- new sequential merge connector to merge a globally ordered result residing
in multiple partitions (in addition to the connector's partition computer).
- "asterix-lang-aql/pom.xml" is changed as a result of refactoring
code related to the range map handling.
- new private sampling function to generate the range map object
(local & global functions) & their type computers.

user model changes:
- new compiler property is added to enable and disable parallel sort.

interface changes:
- "ILogicalOperatorVisitor.java" includes Forward Operator.
- "ITuplePartitionComputer.java" includes initialize() to enable partitioner
to do some initialization. FieldRangePartitionComputerFactory uses it to
pick a range map.
- "ITuplePartitionComputerFactory.java". createPartitioner() is changed to
createPartitioner(IHyracksTaskContext hyracksTaskContext). Context is needed
for transferring the range map throught the context.

Change-Id: I73e128029a46f45e6b68c23dfb9310d5de10582f
Reviewed-on: https://asterix-gerrit.ics.uci.edu/2393
Tested-by: Jenkins <jenkins@fulliautomatix.ics.uci.edu>
Contrib: Jenkins <jenkins@fulliautomatix.ics.uci.edu>
Integration-Tests: Jenkins <jenkins@fulliautomatix.ics.uci.edu>
Reviewed-by: Dmitry Lychagin <dmitry.lychagin@couchbase.com>