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What issue is this change attempting to solve?
Replace 5xx error with 400 Bad Request when we are calling
groupByNode
with invalidnodeNum
argument.How does this change solve the problem? Why is this the best approach?
Example error:
"Bad Request (400) Details: expression eval failed: groupByNode: invalid function argument value: -8 "
Related #291 . For now, we just validate, do not support negative index.
How can we be sure this works as expected?
Tested by hand.