Github user tedyu commented on a diff in the pull request:
https://github.com/apache/flink/pull/3825#discussion_r114923660
--- Diff:
flink-libraries/flink-cep/src/main/java/org/apache/flink/cep/pattern/conditions/AndCondition.java
---
@@ -32,8 +34,8 @@
private final IterativeCondition<T> right;
public AndCondition(final IterativeCondition<T> left, final
IterativeCondition<T> right) {
- this.left = left;
- this.right = right;
+ this.left = Preconditions.checkNotNull(left, "The condition
cannot be null.");
--- End diff --
Better indicate whether left or right is null in the message.
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