pyflink.table.table_environment.StreamTableEnvironment.create_java_temporary_system_function

StreamTableEnvironment.create_java_temporary_system_function(name: str, function_class_name: str)

Registers a java user defined function class as a temporary system function.

Compared to .. seealso:: create_java_temporary_function(), system functions are identified by a global name that is independent of the current catalog and current database. Thus, this method allows to extend the set of built-in system functions like TRIM, ABS, etc.

Temporary functions can shadow permanent ones. If a permanent function under a given name exists, it will be inaccessible in the current session. To make the permanent function available again one can drop the corresponding temporary system function.

Example:

>>> table_env.create_java_temporary_system_function("func",
...     "java.user.defined.function.class.name")

Parameters:

• name – The name under which the function will be registered globally.

• function_class_name – The java full qualified class name of the function class containing the implementation. The function must have a public no-argument constructor and can be founded in current Java classloader.

Added in version 1.12.0.