How Hard Is It to Add an Index to an Open Format? Lessons from the Apache Iceberg Community

The Apache Iceberg community is tackling the complex challenge of adding secondary indexes to its open data format, which involves more than just storing index files but designing a comprehensive indexing ecosystem. This effort is crucial for addressing performance issues like the "needle in a haystack" problem and improving query efficiency by reducing the number of candidate files that need to be opened. The community is advancing both a universal index framework and implementing specific features like the Bloom Filter Skipping Index, which shows promising results in practical scenarios.

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