# geohash

[Geohash](https://en.wikipedia.org/wiki/Geohash) is a public domain spatial index.

## GEOHASH\_BOUNDARY <a href="#geohash_boundary" id="geohash_boundary"></a>

```sql
GEOHASH_BOUNDARY(index)
```

**Description**

Returns a geography representing the geohash cell. It will return `null` on error (invalid input).

**Input parameters**

* `index`: `STRING` The Geohash cell index. The maximum length supported is 17.

**Return type**

`GEOGRAPHY`

**Example**

{% tabs %}
{% tab title="carto-un" %}

```sql
SELECT `carto-un`.carto.GEOHASH_BOUNDARY('ezrqcjzgdr3');
-- POLYGON((-1.00000128149986 41.9999988377094, -0.999999940395355 41.9999988377094, ...
```

{% endtab %}

{% tab title="carto-un-eu" %}

```sql
SELECT `carto-un-eu`.carto.GEOHASH_BOUNDARY('ezrqcjzgdr3');
-- POLYGON((-1.00000128149986 41.9999988377094, -0.999999940395355 41.9999988377094, ...
```

{% endtab %}

{% tab title="manual" %}

```sql
SELECT carto.GEOHASH_BOUNDARY('ezrqcjzgdr3');
-- POLYGON((-1.00000128149986 41.9999988377094, -0.999999940395355 41.9999988377094, ...
```

{% endtab %}
{% endtabs %}

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