add docs for h3GetPentagonIndexes func

docs/en/sql-reference/functions/geo/h3.md

@@ -1171,4 +1171,40 @@ Result:
 └─────────────────────────────────────────────┘
 ```
 
+## h3GetPentagonIndexes {#h3getpentagonindexes}
+
+Returns all the pentagon H3 indexes at the specified resolution.
+
+**Syntax**
+
+``` sql
+h3GetPentagonIndexes(resolution)
+```
+
+**Parameter**
+
+-   `resolution` — Index resolution. Range: `[0, 15]`. Type: [UInt8](../../../sql-reference/data-types/int-uint.md).
+
+**Returned value**
+
+-  Array of all pentagon H3 indexes.
+
+Type: [Array](../../../sql-reference/data-types/array.md)([UInt64](../../../sql-reference/data-types/int-uint.md)).
+
+**Example**
+
+Query:
+
+``` sql
+SELECT h3GetPentagonIndexes(3) AS indexes;
+```
+
+Result:
+
+``` text
+┌─indexes────────────────────────────────────────────────────────┐
+│ [590112357393367039,590464201114255359,590816044835143679,...] │
+└────────────────────────────────────────────────────────────────┘
+```
+
 [Original article](https://clickhouse.com/docs/en/sql-reference/functions/geo/h3) <!--hide-->