Add 'The Startree/Pinot null value support' to docs

Author: sergisulca

docs/pages/product/configuration/data-sources/pinot.mdx

@@ -42,14 +42,15 @@ CUBEJS_DB_PASS=**********
 
 ## Environment Variables
 
-| Environment Variable | Description                                | Possible Values     | Required |
-|----------------------|--------------------------------------------|---------------------|:--------:|
-| `CUBEJS_DB_HOST`     | The host URL for your Pinot broker         | A valid host URL    |    ✅    |
-| `CUBEJS_DB_PORT`     | The port for the database connection       | A valid port number |    ✅    |
-| `CUBEJS_DB_USER`     | The username used to connect to the broker | A valid username    |    ❌    |
-| `CUBEJS_DB_PASS`     | The password used to connect to the broker | A valid password    |    ❌    |
-| `CUBEJS_DB_NAME`     | The database name for StarTree             | A valid name        |    ❌    |
-| `CUBEJS_DB_PINOT_AUTH_TOKEN` | The authentication token for StarTree | A valid token    |    ❌    |
+| Environment Variable          | Description                                           | Possible Values     | Required |
+|-------------------------------|-------------------------------------------------------|---------------------|:--------:|
+| `CUBEJS_DB_HOST`              | The host URL for your Pinot broker                    | A valid host URL    |    ✅    |
+| `CUBEJS_DB_PORT`              | The port for the database connection                  | A valid port number |    ✅    |
+| `CUBEJS_DB_USER`              | The username used to connect to the broker            | A valid username    |    ❌    |
+| `CUBEJS_DB_PASS`              | The password used to connect to the broker            | A valid password    |    ❌    |
+| `CUBEJS_DB_NAME`              | The database name for StarTree                        | A valid name        |    ❌    |
+| `CUBEJS_DB_NULL_HANDLING`     | If `true`, enables null handling. Default is `false`  | `true`, `false`     |    ❌    |
+| `CUBEJS_DB_PINOT_AUTH_TOKEN`  | The authentication token for StarTree                 | A valid token       |    ❌    |
 
 ## Pre-Aggregation Feature Support
 

docs/pages/reference/configuration/environment-variables.mdx

@@ -740,6 +740,15 @@ The Snowflake warehouse to use when connecting to the database.
 | ---------------------------------------------------------------------- | ---------------------- | --------------------- |
 | [A valid Snowflake warehouse][snowflake-docs-warehouse] in the account | N/A                    | N/A                   |
 
+## `CUBEJS_DB_NULL_HANDLING`
+
+The Startree/Pinot null value support. If `true`, enables null handling.
+
+| Possible Values | Default in Development | Default in Production |
+| --------------- | ---------------------- | --------------------- |
+| `true`, `false` | `false`                | `false`               |
+
+
 ## `CUBEJS_DB_SSL`
 
 If `true`, enables SSL encryption for database connections from Cube.