pyflink.table.expressions.call

call(f: Union[str, pyflink.table.udf.UserDefinedFunctionWrapper], *args) → pyflink.table.expression.Expression

The first parameter f could be a str or a Python user-defined function.

When it is str, this is a call to a function that will be looked up in a catalog. There are two kinds of functions:

• System functions - which are identified with one part names

• Catalog functions - which are identified always with three parts names

  (catalog, database, function)

Moreover each function can either be a temporary function or permanent one (which is stored in an external catalog).

Based on that two properties the resolution order for looking up a function based on the provided function_name is following:

• Temporary system function

• System function

• Temporary catalog function

• Catalog function

Parameters

• f – the path of the function or the Python user-defined function.

• args – parameters of the user-defined function.

New in version 1.12.0.