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AQG-443: document DDSQL's akeys and avals functions #32714

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Nov 11, 2025
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AQG-443: document DDSQL's akeys and avals functions #32714

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AQG-443: document DDSQL's `akeys` and `avals` functions
deigote Nov 10, 2025
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AQG-443: use singular for tag when used in a genitive sentence
deigote Nov 10, 2025
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AQG-443: use correct casing, verb time and order of function params
deigote Nov 11, 2025
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18 changes: 15 additions & 3 deletions content/en/ddsql_reference/_index.md
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</table>





## Tags

DDSQL exposes tags as an `hstore` type, which is inspired by PostgreSQL. You can access the values for specific tag keys using the PostgreSQL arrow operator. For example:
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ON da.tags = de.tags -- for a specific tag: da.tags->'app' = de.tags->'app'
```

Additionally, you can extract tag keys and values into individual arrays of text:

```sql
SELECT akeys(tags), avals(tags)
FROM aws.ec2_instance
```

### HSTORE functions and operators

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'HSTORE functions and operators' should use sentence-style capitalization.

| Name | Return type | Description |
|-----------------------------------------------|---------------|---------------------------------------------------------------------------------------------------
| tags -> 'text' | Text | Gets the value for a given key. Returns `null` if key is not present. |
| akeys(hstore tags) | Array of text | Gets the keys of an HSTORE as an array |
| avals(hstore tags) | Array of text | Gets the values of an HSTORE as an array |

## Further reading

{{< partial name="whats-next/whats-next.html" >}}
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