I hereby agree to the terms of the CLA available at: https://docs.databend.com/dev/policies/cla/

Summary

• Support ASOF JOIN ... USING (...) in the query binder
• Treat the final USING column as the ASOF range key and preceding columns as equality keys
• Keep duplicate USING columns hidden from unqualified wildcard output, including right ASOF joins

Related to #15423

Changes

This enables SQL like:

SELECT *
FROM trades t
ASOF JOIN prices p
USING (symbol, wh);

The binder rewrites the final USING column into the default ASOF range predicate (left >= right) while preserving the existing USING equality behavior for earlier keys.

Tests

• Unit Test
• Logic Test
• Benchmark Test
• No Test - Pair with the reviewer to explain why

Commands run:

cargo fmt --check
git diff --check
cargo test -p databend-common-sql --lib bind_asof_join
target/debug/databend-sqllogictests --run 'tests/sqllogictests/suites/duckdb/join/asof/test_asof_join_eq_hash_fast_path.test'

Type of change

• New feature (non-breaking change which adds functionality)

This change is