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Error message

{context}: at least one configuration field must be provided

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When this error occurs

This error applies to nested nodes (items) and nested properties (entries in a properties array). Unlike top-level fields, which can be empty to indicate inheritance, nested nodes must explicitly declare their configuration. A nested node or property with none of enabled_stats, stat_options, self, properties, or items is invalid.
This error does not apply to top-level field entries (e.g., dataset.fields[user_id]). A top-level field with only a field_name and no other fields is valid — it means “inherit from the namespace scope or defaults.”

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Example: request that triggers this error

{
  "defaults": {
    "enabled_stats": ["value_count"]
  },
  "refresh": { "trigger": "manual" },
  "dataset": {
    "fields": [
      {
        "field_name": "address",
        "properties": [
          {
            "path": "city"
          }
        ]
      }
    ]
  }
}
The property city has only a path — no stat configuration.

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How to fix

Add at least one configuration field to the nested node or property: 
{
  "field_name": "address",
  "properties": [
    {
      "path": "city",
      "enabled_stats": ["value_count", "null_value_count"]
    }
  ]
}
If you don’t want to configure stats for a specific property, remove it from the properties array entirely. Unlisted properties receive no stats.