Nick Allen created METRON-626:
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Summary: Add Higher-Order Map Function to Stellar
Key: METRON-626
URL: https://issues.apache.org/jira/browse/METRON-626
Project: Metron
Issue Type: Improvement
Reporter: Nick Allen
It would be extremely useful to have a 'map' higher-order function in Stellar.
A 'flat map' might also be needed.
[https://en.wikipedia.org/wiki/Map_(higher-order_function)]
A few examples that I am thinking of. Ignore my choice of syntax. I am just
trying to express the use cases here.
Fetch all of the profile measurements over the past 2 hours. There may be
many. What is the mean of each of those measurements?
{code}
stats := PROFILE_GET('p1', 'e1', 2, "HOURS")
stats.MAP( s -> STATS_MEAN(s))
{code}
Get profile measurements taken 1 week ago, 2 weeks ago, and 3 weeks ago, so
that I can then compare them.
{code}
{ "1 week", "2 weeks", "3 weeks" }.MAP( lookback -> PROFILE_GET('p1','e1',
lookback)
{code}
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