Spark docs (#222)

* Spark docs

* Apply suggestions from code review

---------

Co-authored-by: Edmondo Porcu <edmondoporcu@Egles-MacBook-Air.local>
Co-authored-by: Phillip LeBlanc <phillip@leblanc.tech>

spiceaidocs/docs/data-connectors/spark.md

@@ -0,0 +1,109 @@
+---
+title: 'Apache Spark Connector'
+sidebar_label: 'Apache Spark Connector'
+description: 'Apache Spark Connector Documentation'
+pagination_prev: null
+---
+
+import Tabs from '@theme/Tabs';
+import TabItem from '@theme/TabItem';
+
+Apache Spark as a connector for federated SQL query against a Spark Cluster using [Spark Connect](https://spark.apache.org/docs/latest/spark-connect-overview.html)
+
+## Configuration
+
+The Apache Spark Connector can be used in two ways: specifying a plaintext connection string using the `spark_remote` parameter or specifying a `spark_remote` secret. The connector will fail if both configurations are set.
+
+
+### Parameters
+- `spark_remote`: A [spark remote](https://spark.apache.org/docs/latest/spark-connect-overview.html#set-sparkremote-environment-variable) connection URI
+
+### Auth
+
+Spark clusters configured to accept authenticated requests should not set `spark_remote` as an inline dataset param, as it will contain sensitive data. For this case, use a secret named `spark` with key `spark_remote`.
+
+Check [Secrets Stores](/secret-stores) for more details.
+
+<Tabs>
+  <TabItem value="local" label="Local" default>
+    ```bash
+    spice login spark --spark_remote <spark-remote>
+    ```
+
+    Learn more about [File Secret Store](/secret-stores/file).
+  </TabItem>
+  <TabItem value="env" label="Env">
+    ```bash
+    SPICE_SECRET_SPARK_SPARK_REMOTE=<spark-remote> \
+    spice run
+    ```
+
+    `spicepod.yaml`
+    ```yaml
+    version: v1beta1
+    kind: Spicepod
+    name: spice-app
+
+    secrets:
+      store: env
+
+    # <...>
+    ```
+
+    Learn more about [Env Secret Store](/secret-stores/env).
+  </TabItem>
+  <TabItem value="k8s" label="Kubernetes">
+    ```bash
+    kubectl create secret generic spark \
+      --from-literal=spark_remote='<spark-remote>'
+    ```
+
+    `spicepod.yaml`
+    ```yaml
+    version: v1beta1
+    kind: Spicepod
+    name: spice-app
+
+    secrets:
+      store: kubernetes
+
+    # <...>
+    ```
+
+    Learn more about [Kubernetes Secret Store](/secret-stores/kubernetes).
+  </TabItem>
+  <TabItem value="keyring" label="Keyring">
+    Add new keychain entry (macOS), with user and password in JSON string
+
+    ```bash
+    security add-generic-password -l "Spark Remote" \
+    -a spiced -s spice_secret_spark \
+    -w $(echo -n '{"spark_remote": "spark"}')
+    ```
+
+    `spicepod.yaml`
+    ```yaml
+    version: v1beta1
+    kind: Spicepod
+    name: spice-app
+
+    secrets:
+      store: keyring
+
+    # <...>
+    ```
+
+    Learn more about [Keyring Secret Store](/secret-stores/keyring).
+  </TabItem>
+</Tabs>
+
+## Example
+
+```yaml
+datasets:
+  - from: spark:spiceai.datasets.my_awesome_table
+    name: my_table
+    params:
+      spark_remote: sc://localhost
+
+```

spiceaidocs/docs/reference/spicepod/datasets.md

@@ -78,6 +78,7 @@ Where:
 
   - [`spiceai`](../../data-connectors/spiceai.md)
   - [`dremio`](../../data-connectors/dremio.md)
+  - [`spark`](../../data-connectors/spark.md)
   - [`databricks`](../../data-connectors/databricks.md)
   - [`s3`](../../data-connectors/s3.md)
   - [`postgres`](../../data-connectors/postgres/index.md)