You have a DataFrame `df` with a column `event_data` containing JSON strings. How would you extract the nested field `event.details.timestamp` from these JSON strings into a new column named `event_timestamp` using Spark? Provide the code snippet.

Simulated

df.withColumn('event_timestamp', get_json_object(col('event_data'), '$.event.details.timestamp'))

54.7%

df.select(get_json_object(col('event_data'), '$.event.details.timestamp').alias('event_timestamp'))

9.9%

df.withColumn('event_timestamp', from_json(col('event_data'), 'event.details.timestamp'))_

23.9%

df.select(from_json(col('event_data'), 'event.details.timestamp').alias('event_timestamp'))_

11.5%

Databricks Certified Data Engineer - Associate