CODEWITHSUNDEEP
amazon-web-servicesjsonpathaws-step-functions
Matthias Pichler
Matthias Pichler

Reputation: 73

AWS StepFunctions sum() function returns error about not finding path

I have a StepFunction with input:

{
  "Jobs": [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,0,0,0,0,0]
}

and I want the sum of the values in this array. According to the Json-Path docs there should exist a .sum() function for this. When I try it here it even works. So I defined the following Pass state:

"Sum Jobs": {
  "Type": "Pass",
  "Parameters": {
   "Jobs.$": "$.Jobs.sum()"
  }
},

Nevertheless executions fail with:

"An error occurred while executing the state 'Sum Jobs' (entered at the event id #249). The JSONPath '$.Jobs.sum()' specified for the field 'Jobs.$' could not be found in the input '{\"Jobs\":[0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,0,0,0,0,0]}'"

Upvotes: 0

Views: 836

Answers (1)

fedonev
fedonev

Reputation: 25739

You will need a Lambda Task for this. Step Functions' intrinsic functions (= operations accessible outside of tasks), do not include any math or array manipulation operations.

Upvotes: 1

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