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How can you maximize the efficiency of Spark's Cost-Based Optimizer (CBO) for complex SQL queries involving multiple data sources and transformations?
A
Increase the value of spark.sql.cbo.enabled to a higher level than the default to enhance the optimizer's capabilities.
B
Manually define the execution plan for complex queries, bypassing the CBO, to ensure optimal performance.
C
Annotate queries with explicit optimizer hints to guide the CBO in choosing the most efficient execution plan.
D
Collect and maintain table statistics (e.g., via ANALYZE TABLE COMPUTE STATISTICS) for all tables involved in the query to provide the CBO with necessary information.
