GitHub user cestella opened a pull request:
https://github.com/apache/metron/pull/609
METRON-987: Allow stellar enrichments to be specified by a list as well as
a map
## Contributor Comments
Currently, stellar enrichments are specified by a map associating fields
with the stellar expressions associated with the fields. There is a significant
downside here in that you cannot update previously assigned fields. For
instance, the following cannot be represented currently:
```
"fieldMap": {
...
"stellar" : {
"config" : {
"hostname" : "if ENDS_WITH(hostname, '.') then CHOP(hostname)
else hostname",
"hostname" : "TO_LOWER(hostname)"
}
}
}
```
This would now be allowed thusly:
```
"fieldMap": {
...
"stellar" : {
"config" : [
"hostname := if ENDS_WITH(hostname, '.') then CHOP(hostname) else
hostname",
"hostname := TO_LOWER(hostname)"
]
}
}
```
A consequent of this deficiency is that we also cannot use temporary
variables and unset them after their use inside an enrichment group.
The proposed change is to allow users to use lists of strings representing
stellar expression assignments with the same syntax as the Stellar REPL. This
would be as an alternative to maps, but the map syntax would also be supported
for legacy.
Test plan to follow in comments.
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#### Note:
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You can merge this pull request into a Git repository by running:
$ git pull https://github.com/cestella/incubator-metron stellar_list_support
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/metron/pull/609.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #609
----
commit e9ea04bc6e9f42e1029d1d7fa6e98fa00e0226fe
Author: cstella <[email protected]>
Date: 2017-06-06T22:21:49Z
Adding the ability to specify Stellar enrichments as lists as well as Maps.
commit cba07c78d91451eb1ec318418c418269e7127e38
Author: cstella <[email protected]>
Date: 2017-06-06T23:17:11Z
Documentation update
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