Answer-first summary for fast verification
Answer: It improves filtering and query performance for non-partitioned columns by colocating related data within files.
Z-ordering (multi-dimensional clustering) is a technique used in Delta Lake to colocate related information in the same set of files. This data locality is particularly effective for optimizing filtering and query performance on non-partitioned columns, as it allows the engine to skip irrelevant data more effectively during query execution.
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In the context of Delta Lake performance optimization, which of the following best describes what Z-ordering optimizes?
A
It enhances filtering efficiency specifically for partition keys.
B
It improves filtering and query performance for non-partitioned columns by colocating related data within files.
C
It is primarily used to reduce file sizes to increase parallelism across the cluster.
D
It optimizes shuffle operations when joining tables on high-cardinality columns.
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