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IGNITE-24401 Document nested SQL in Calcite UDFs #13248

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IGNITE-24401 Document nested SQL in Calcite UDFs #13248

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4 changes: 4 additions & 0 deletions docs/_docs/SQL/custom-sql-func.adoc
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Expand Up @@ -68,4 +68,8 @@ NOTE: Creating custom functions in the system schema is forbidden. Creating a cu

NOTE: The table functions and application attributes are currently available only with link:SQL/sql-calcite[Calcite, window=_blank].

NOTE: With link:SQL/sql-calcite[Calcite, window=_blank], a custom SQL function can execute nested SQL queries through Ignite APIs such as `SqlFieldsQuery` only when the blocking query task executor is enabled with the `-DIGNITE_CALCITE_USE_QUERY_BLOCKING_TASK_EXECUTOR=true` system property. The default striped query task executor can lead to deadlocks for queries started from user-defined functions.

NOTE: When nested SQL queries are executed from user-defined functions, configure `IgniteConfiguration.QueryThreadPoolSize` so it is greater than the maximum number of concurrent queries initiated from UDFs. Otherwise, nested queries can fail because of query thread pool starvation.

NOTE: Classes registered with `CacheConfiguration.setSqlFunctionClasses(...)` must be added to the classpath of all the nodes where the defined custom functions might be executed. Otherwise, you will get a `ClassNotFoundException` error when trying to execute the custom function.