Add documentation for octet_length

docs/sql-reference/functions-reference/index.md

@@ -173,6 +173,8 @@ For more information about using Lambda functions, see [Manipulating arrays with
 
 * [LENGTH](length-string.md)
 
+* [OCTET_LENGTH](octet_length.md)
+
 ## Conditional and miscellaneous functions
 
 * [CASE](case.md)

docs/sql-reference/functions-reference/octet_length.md

@@ -0,0 +1,41 @@
+---
+layout: default
+title: OCTET_LENGTH
+description: Reference material for OCTET_LENGTH function
+parent: SQL functions
+---
+
+# LENGTH
+
+Calculates the length of the input string in bytes.
+
+## Syntax
+{: .no_toc}
+
+```sql
+OCTET_LENGTH(<expression>)
+```
+## Parameters 
+{: .no_toc}
+
+| Parameter      | Description                                  |Supported input types |
+| :--------------| :--------------------------------------------|:----------------------|
+| `<expression>` | The string or binary data for which to return the length.   | `TEXT`, `BYTEA`       |
+
+## Return Type
+`BIGINT` 
+
+## Example
+{: .no_toc}
+
+Use the `OCTET_LENGTH` to find the length of any string in bytes, such as: 
+
+```sql
+SELECT OCTET_LENGTH('🔥')
+```
+
+**Returns**: `4`
+
+Because the UTF8 encoding of '🔥' has the byte sequence `0xF0 0x9F 0x94 0xA5`.
+
+