tree c548c27da6f205de15ad211c97debccf33e1ac3a
parent 172ce0b89b896967ed69024f0c9f9ea6ec1df62f
author Xikui Wang <xkkwww@gmail.com> 1519355837 -0800
committer Xikui Wang <xkkwww@gmail.com> 1519411240 -0800

[ASTERIXDB-2227][ING] Enabling filitering incoming data in feed

- user model changes: yes
  Add syntax support for specifying predicate in connect feed
- storage format changes: no
- interface changes: no

Details:
In some use cases, a user may want to filter the incombing data with
certain attributes. One example can be only store the incoming tweets
with geo locations. This patch enables the <WHERE> clause in connect
feed statement. User can subset the incoming data using following
syntax:

 connect feed feeds.TweetFeed to  dataset Tweets3 using policy `Basic`
 WHERE id NOT LIKE 'nc1:10%' OR username = 'BronsonMike';

Change-Id: I0b3cc6fe9d7fb5f5645dd9c759da448bfe1e88f1
Reviewed-on: https://asterix-gerrit.ics.uci.edu/2255
Sonar-Qube: Jenkins <jenkins@fulliautomatix.ics.uci.edu>
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: abdullah alamoudi <bamousaa@gmail.com>