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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