*Note: * Testing has shown PostgreSQL's hash indexes to perform no better than B-tree indexes, and the index size and build time for hash indexes is much worse. For these reasons, hash index use is presently discouraged.

May I know for simple "=" operation query, for "Hash index" vs. "B-tree" index, which can provide better performance please?

If you trust the documentation use a b-tree. If you don't trust the documentation do your own tests.

please don't cross post.

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