Github user iyerr3 commented on a diff in the pull request:
https://github.com/apache/incubator-madlib/pull/116#discussion_r112040453
--- Diff: methods/array_ops/src/pg_gp/array_ops.sql_in ---
@@ -636,3 +663,30 @@ CREATE OR REPLACE FUNCTION
MADLIB_SCHEMA.array_cum_prod(x anyarray) RETURNS anya
AS 'MODULE_PATHNAME', 'array_cum_prod'
LANGUAGE C IMMUTABLE
m4_ifdef(`__HAS_FUNCTION_PROPERTIES__', `NO SQL', `');
+
+/**
+ * @brief This function takes a 2-D array as the input and unnests it
+ * by one level.
+ * It returns a set of 1-D arrays that correspond to rows of
+ * the input array as well as an ID column with values corresponding
+ * to positions occupied by the 1-D arrays within the 2-D array.
+ *
+ * @param x Array x
+ * @returns Set of 1-D arrays that corrspond to rows of x and an ID column.
+ *
+ */
+CREATE OR REPLACE FUNCTION MADLIB_SCHEMA.array_unnest_2d_to_1d(x ANYARRAY,
OUT unnest_2d_to_1d_id BIGINT, OUT unnest_2d_to_1d_result ANYARRAY)
+RETURNS SETOF RECORD
--- End diff --
The "unnest_2d_to_1d_id" can be an INTEGER, we won't have indices bigger
than that.
Also maybe call it just "id" or "row_id/row_num"?
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