> ## Documentation Index
> Fetch the complete documentation index at: https://docs.narrative.io/llms.txt
> Use this file to discover all available pages before exploring further.

# Unsupported Statistics for Container Node

> Only null_value_count is supported for non-primitive self configs

## Error message

```
{context}: only null_value_count is supported for non-primitive self configs; unsupported: {stat_names}
```

Example: `dataset.fields[address].self: only null_value_count is supported for non-primitive self configs; unsupported: value_count, histogram`

## When this error occurs

The `self` field on a non-primitive node (object or array) configures stats for the **container column itself** — not its children. For a struct or array column, the only meaningful stat at the container level is `null_value_count` (counting rows where the entire container is NULL).

Stats like `value_count`, `histogram`, `mean`, etc. don't have well-defined semantics on a container value and are rejected.

## Example: request that triggers this error

```json theme={null}
{
  "defaults": {
    "enabled_stats": ["value_count"]
  },
  "refresh": { "trigger": "manual" },
  "dataset": {
    "fields": [
      {
        "field_name": "address",
        "self": {
          "enabled_stats": ["value_count", "null_value_count", "histogram"]
        },
        "properties": [
          {
            "path": "city",
            "enabled_stats": ["value_count"]
          }
        ]
      }
    ]
  }
}
```

`self` includes `value_count` and `histogram`, which are not supported for non-primitive self configs.

## How to fix

Restrict `self.enabled_stats` to only `null_value_count`:

```json theme={null}
{
  "field_name": "address",
  "self": {
    "enabled_stats": ["null_value_count"]
  },
  "properties": [
    {
      "path": "city",
      "enabled_stats": ["value_count"]
    }
  ]
}
```

If you don't need null counting on the container, remove `self` entirely:

```json theme={null}
{
  "field_name": "address",
  "properties": [
    {
      "path": "city",
      "enabled_stats": ["value_count"]
    }
  ]
}
```

## Related errors

* [MixedNodeConfig](/reference/architecture/dataset-statistics/errors/mixed-node-config) — mixing primitive and non-primitive config fields