document new filters and stuff (#14760)

docs/ingestion/ingestion-spec.md

@@ -186,7 +186,7 @@ Treat `__time` as a millisecond timestamp: the number of milliseconds since Jan
 ### `dimensionsSpec`
 
 The `dimensionsSpec` is located in `dataSchema` → `dimensionsSpec` and is responsible for
-configuring [dimensions](./schema-model.md#dimensions). An example `dimensionsSpec` is:
+configuring [dimensions](./schema-model.md#dimensions).
 
 You can either manually specify the dimensions or take advantage of schema auto-discovery where you allow Druid to infer all or some of the schema for your data. This means that you don't have to explicitly specify your dimensions and their type. 
 

docs/ingestion/schema-design.md

@@ -261,6 +261,8 @@ native boolean types, Druid ingests these values as strings if `druid.expression
 the [array functions](../querying/sql-array-functions.md) or [UNNEST](../querying/sql-functions.md#unnest). Nested
 columns can be queried with the [JSON functions](../querying/sql-json-functions.md).
 
+We also highly recommend setting `druid.generic.useDefaultValueForNull=false` when using these columns since it also enables out of the box `ARRAY` type filtering. If not set to `false`, setting `sqlUseBoundsAndSelectors` to `false` on the [SQL query context](../querying/sql-query-context.md) can enable `ARRAY` filtering instead.
+
 Mixed type columns are stored in the _least_ restrictive type that can represent all values in the column. For example:
 
 - Mixed numeric columns are `DOUBLE`