An ingestion job appends a DataFrame to catalog.sales.customers, an existing Delta table. This week the source schema added a new column, loyalty_tier, and the append now fails Delta's schema enforcement. The team wants the write to succeed by adding the new column to the table, and no existing rows should be rewritten. Which write option achieves this?
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Correct answer: Use .option('mergeSchema', 'true'), which evolves the table schema additively — the new column is added with no rewrite
Reference: https://docs.databricks.com/aws/en/delta/best-practices
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Official Answer (B): Use .option('mergeSchema', 'true'), which evolves the table schema additively — the new column is added with no rewrite
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