tree 1e9d5229584ad4e654490fa5132cab72d42d1281
parent 799046dfaaa97e30758ab77e3974d00c1a1ed017
author Xikui Wang <xkkwww@gmail.com> 1508530350 -0700
committer Xikui Wang <xkkwww@gmail.com> 1508602223 -0700

[ASTERIXDB-1983] Feed pipeline refactoring for SQL++

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

Current implementation of feed uses handcraft AQL queries for creating
feed pipeline. This causes a lot of issues and does not support SQL++
very well. Also, there is an overhead for parsing the query everytime.
In this patch, it's replaced with compiled statement in SQL++ which
provides support for attaching UDF to feed as well.

Details:
1. Remove SubscribeFeedStatement.
2. Remove SubscribeFeed related query compilation code, and reuse the
upsert dataflow.
3. Added SQL++ User Defined Function support for feed, including adding
multiple functions to one feed.
4. Related test cases added.
5. Change the default behavior of feed to be upsert instead of upsert.
'insert-feed' option is provided for experiment uses.
6. This patch also fixes several feed related bugs: [ASTERIXDB-2085]
[ASTERIXDB-2124].

Change-Id: I0ae5a837613780a4d2c90c98139fdc6d5e040cc9
Reviewed-on: https://asterix-gerrit.ics.uci.edu/2059
Sonar-Qube: Jenkins <jenkins@fulliautomatix.ics.uci.edu>
Tested-by: Jenkins <jenkins@fulliautomatix.ics.uci.edu>
Contrib: Jenkins <jenkins@fulliautomatix.ics.uci.edu>
Reviewed-by: abdullah alamoudi <bamousaa@gmail.com>
Integration-Tests: Jenkins <jenkins@fulliautomatix.ics.uci.edu>