Github user ottobackwards commented on the issue:
https://github.com/apache/metron/pull/718
Ok, the question here is this. I have 3 statements in the transform
{
"title" : "casey is stellar"
}
{
"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()
}
}
If the second function results in the removal of title... what do we do?
What was the intent of that null ( from a UDF maybe ), we don't know if it was
to remove or not.
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