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From haoch <...@git.apache.org>
Subject [GitHub] incubator-eagle pull request #708: [MINOR] support group by in siddhi patter...
Date Mon, 05 Dec 2016 02:26:51 GMT
Github user haoch commented on a diff in the pull request:

    https://github.com/apache/incubator-eagle/pull/708#discussion_r90795623
  
    --- Diff: eagle-core/eagle-alert-parent/eagle-alert/alert-engine/src/main/java/org/apache/eagle/alert/engine/interpreter/PolicyExecutionPlan.java
---
    @@ -32,6 +32,11 @@
         private Map<String, List<StreamColumn>> inputStreams;
     
         /**
    +     * Actual input streams alias.
    +     */
    +    private Map<String, String> inputStreamAlias;
    --- End diff --
    
    For example, as to two SQL: `select a.name, a.value from TABLE_A as a` and  `select name,
value from TABLE_A` and `select TABLE_A.name, TABLE_A.value from TABLE_A`, what the execution
engine needs to know is just:
    * Input: `TABLE_A`
    * Output: [`TABLE_A.name`,`TABLE_A.value` ]
    
    Why needs `a -> TABLE_A` ?


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