To sort a PySpark DataFrame by multiple columns with mixed sort directions, the correct usage is:

python

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df.orderBy('age', 'salary', ascending=[True, False])

age will be sorted in ascending order

salary will be sorted in descending order

The orderBy() and sort() methods in PySpark accept a list of booleans to specify the sort direction for each column.

Documentation Reference: PySpark API - DataFrame.orderBy