docs for h3GetOriginIndexFromUnidirectionalEdge

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

@@ -1100,4 +1100,40 @@ Result:
 │          1 │
 └────────────┘
 ```
+
+## h3GetOriginIndexFromUnidirectionalEdge {#h3getoriginindexfromunidirectionaledge}
+
+Returns the origin hexagon index from the unidirectional edge H3Index.
+
+**Syntax**
+
+``` sql
+h3GetOriginIndexFromUnidirectionalEdge(edge)
+```
+
+**Parameter**
+
+-   `edge` — Hexagon index number that represents a unidirectional edge. Type: [UInt64](../../../sql-reference/data-types/int-uint.md).
+
+**Returned value**
+
+-  Origin Hexagon Index number.
+
+Type: [UInt64](../../../sql-reference/data-types/int-uint.md).
+
+**Example**
+
+Query:
+
+``` sql
+ SELECT h3GetOriginIndexFromUnidirectionalEdge(1248204388774707197) as origin;
+```
+
+Result:
+
+``` text
+┌─────────────origin─┐
+│ 599686042433355773 │
+└────────────────────┘
+```
 [Original article](https://clickhouse.com/docs/en/sql-reference/functions/geo/h3) <!--hide-->