Github user cestella commented on the issue:
https://github.com/apache/metron/pull/718
Currently you cannot have two statements in stellar field transformations
with the same variable, so
```
{
"transformation" : "STELLAR"
,"output" : [ "better_title", "title"]
,"config" : {
"better_title" : "title"
,"title" : "SOME_UDF_THAT_CAN_RET_NULL()"
,"title" : "if title == null then GET_RANDOM_TITLE()
}
}
```
would evaluate only the last `title` expression. It's a problem with our
use of maps and why in enrichment we transitioned to lists of strings as an
alternative ð¢
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