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Exam Certified Data Engineer Professional topic 1 question 130 discussion

Actual exam question from Databricks's Certified Data Engineer Professional
Question #: 130
Topic #: 1
[All Certified Data Engineer Professional Questions]

The following table consists of items found in user carts within an e-commerce website.



The following MERGE statement is used to update this table using an updates view, with schema evolution enabled on this table.



How would the following update be handled?

  • A. The update throws an error because changes to existing columns in the target schema are not supported.
  • B. The new nested Field is added to the target schema, and dynamically read as NULL for existing unmatched records.
  • C. The update is moved to a separate "rescued" column because it is missing a column expected in the target schema.
  • D. The new nested field is added to the target schema, and files underlying existing records are updated to include NULL values for the new field.
Show Suggested Answer Hide Answer
Suggested Answer: B 🗳️
by MDWPartners at May 29, 2024, 6:55 p.m.

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Freyr
Highly Voted 10 months, 3 weeks ago
Selected Answer: B
Correct Answer: B. In the question it is mentioned that the schema evolution is enabled. This option states that the new nested field is added to the target schema, and existing records not matching the new schema format are populated with NULL for the newly added columns. This behavior aligns with how schema evolution functions in Delta Lake, dynamically adapting the schema to include new fields.
upvoted 5 times
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HairyTorso
Most Recent 3 months, 2 weeks ago
Selected Answer: B
Seems like B is correct if below config is enabled: SET spark.databricks.delta.schema.autoMerge.enabled = true;
upvoted 1 times
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pppppppppie
7 months, 2 weeks ago
because B says for unmatched records. but my new records has 1001 which is existing record. we should give ans what will happen with this new record. it will update the record in target with NULL as coupon
upvoted 1 times
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pppppppppie
7 months, 2 weeks ago
It has to be D
upvoted 1 times
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MDWPartners
10 months, 3 weeks ago
Selected Answer: B
schema evolution is enabled, so B.
upvoted 4 times
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