Github user jjmeyer0 commented on a diff in the pull request:
https://github.com/apache/incubator-metron/pull/517#discussion_r110520408
--- Diff: metron-platform/metron-common/README.md ---
@@ -466,6 +512,14 @@ The `!=` operator is the negation of the above.
* IANA Number
* Returns: The protocol name associated with the IANA number.
+### `REDUCE`
+ * Description: Reduces a list by a binary lambda expression. That is,
the expression takes two arguments. Usage example: `REDUCE( [ 1, 2, 3 ] , (x,
y) -> x + y)` would sum the input list, yielding `6`.
+ * Input:
+ * list - List of arguments.
+ * binary_operation - The lambda expression function to apply to reduce
the list. It is assumed that this takes two arguments, the first being the
running total and the second being an item from the list.
+ * initial_value - The initial value to use.
--- End diff --
This example is missing the `initial_value`.
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