| --- |
| title: Query Language Restrictions and Unsupported Features |
| --- |
| |
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| |
| At a high level, <%=vars.product_name%> does not support the following querying features: |
| |
| - Indexes targeted for joins across more than one region are not supported |
| - Static method invocations. For example, the following query is invalid: |
| |
| ``` pre |
| SELECT DISTINCT * FROM /QueryRegion0 WHERE aDay = Day.Wednesday |
| ``` |
| |
| - You cannot create an index on fields using Set/List types (Collection types) that are not comparable. The OQL index implementation expects fields to be Comparable. To workaround this, you can create a custom Collection type that implements Comparable. |
| - ORDER BY is only supported with DISTINCT queries. |
| |
| In addition, there are some specific limitations on partitioned region querying. See [Partitioned Region Query Restrictions](../query_additional/partitioned_region_query_restrictions.html#concept_5353476380D44CC1A7F586E5AE1CE7E8). |
| |