Miscellaneous SQL functions (#4776)

content/influxdb/cloud-iox/reference/sql/functions/misc.md

@@ -0,0 +1,78 @@
+---
+title: Miscellaneous SQL functions
+list_title: Miscellaneous functions
+description: >
+  Use miscellaneous SQL functions to perform a variety of operations in SQL queries.
+menu:
+  influxdb_cloud_iox:
+    name: Miscellaneous
+    parent: sql-functions
+weight: 310
+---
+
+The InfluxDB SQL implementation supports the following miscellaneous functions
+for performing a variety of operations:
+
+- [arrow_typeof](#arrow_typeof)
+<!-- - [struct](#struct) -->
+
+## arrow_typeof
+
+Returns the underlying [Arrow type]() of the the expression:
+
+```sql
+arrow_typeof(expression)
+```
+
+##### Arguments
+
+- **expression**: Column or literal value to evaluate.
+
+{{< expand-wrapper >}}
+{{% expand "View `arrow_typeof` query example" %}}
+
+_The following example uses the sample data set provided in
+[Get started with InfluxDB tutorial](/influxdb/cloud-iox/get-started/write/#construct-line-protocol)._
+
+```sql
+SELECT
+  arrow_typeof(time) AS time,
+  arrow_typeof(room) AS room,
+  arrow_typeof(temp) AS temp,
+  arrow_typeof(co) AS co
+FROM home
+LIMIT 1
+```
+
+| time                        | room                    | temp    | co    |
+| :-------------------------- | :---------------------- | :------ | :---- |
+| Timestamp(Nanosecond, None) | Dictionary(Int32, Utf8) | Float64 | Int64 |
+
+{{% /expand %}}
+{{< /expand-wrapper >}}
+
+<!--
+## struct
+
+Returns an Arrow struct using the specified input expressions.
+Fields in the returned struct use the `cN` naming convention.
+For example: `c0`, `c1`, `c2`, etc.
+
+```sql
+struct(expression1[, ..., expression_n])
+```
+
+##### Arguments
+
+- **expression_n**: Column or literal value to include in the output struct.
+
+{{< expand-wrapper >}}
+{{% expand "View `struct` example" %}}
+
+```sql
+struct('A', 'B', 3, 4)
+-- Returns {c0: A, c1: B, c3: 3, c4: 4}
+```
+{{% /expand %}}
+{{< /expand-wrapper >}}
+-->