Preparing Practice Exam…
Please wait a moment while the system generates the exam questions, answers, and study session.
Please wait a moment while the system generates the exam questions, answers, and study session.
Question 41 of 118
Free Preview · 118 of 392 · questions 1–118 of 392 are free. Sign up free to sync your progress across devices.
Select one answer.
Written by other learners. Comments can disagree with the marked answer — check the official documentation when in doubt.
- printSchema() outputs a tree representation of the DataFrame schema: column name, dataType, nullable. Useful to verify structure after loads or transformations. For the physical plan, use df.explain().