Make errors / Schema
Array Aggregator output fails ParseJSON (simple aggregation causes invalid json)
Cause
The Array Aggregator produces an array object, not a JSON string; passing it directly to Parse JSON fails because Parse JSON requires a string input.
Fix
Wrap the aggregator output in join() to produce a comma-separated string (or map()+join() for nested values) before Parse JSON. Validate the result with a JSON validator. For a JSON array string, wrap as '[' + join(array, ',') + ']'.
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