Change in asterixdb[master]: [ASTERIXDB-2152][FUN] Enable utilizing multiple cores in UDF...

["Xikui Wang (Code Review)" <do...@asterixdb.incubator.apache.org>]

Hello Anon. E. Moose #1000171, Jenkins,

I'd like you to reexamine a change.  Please visit

    https://asterix-gerrit.ics.uci.edu/2114

to look at the new patch set (#4).

Change subject: [ASTERIXDB-2152][FUN] Enable utilizing multiple cores in UDF evaluation
......................................................................

[ASTERIXDB-2152][FUN] Enable utilizing multiple cores in UDF evaluation

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

Details:
This change enables specifying runtime parallelism in compiler parameter
for UDF evalution in feed pipeline. By specifying the parallelim level
in the start feed query, the UDF will be evaluated at the specified 
parallel level (limited by the number of cores on each node). An example
is as follow,

        SET `compiler.parallelism` "7";
        start feed TweetFeed;

Change-Id: Id7eed5dac03c2f260507e16cf687162d65787bd1
---
M asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/feeds/feed-with-external-function/feed-with-external-function.3.update.sqlpp
M asterixdb/asterix-metadata/src/main/java/org/apache/asterix/metadata/declared/FeedDataSource.java
2 files changed, 4 insertions(+), 2 deletions(-)


  git pull ssh://asterix-gerrit.ics.uci.edu:29418/asterixdb refs/changes/14/2114/4
-- 
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Gerrit-MessageType: newpatchset
Gerrit-Change-Id: Id7eed5dac03c2f260507e16cf687162d65787bd1
Gerrit-PatchSet: 4
Gerrit-Project: asterixdb
Gerrit-Branch: master
Gerrit-Owner: Xikui Wang <xk...@gmail.com>
Gerrit-Reviewer: Anon. E. Moose #1000171
Gerrit-Reviewer: Jenkins <je...@fulliautomatix.ics.uci.edu>