Observed

Both LZ4 and ZSTD compression methods simply set compress=1:

There's no indication whether to use LZ4 or ZSTD, so the response is always LZ4.

Expected behaviour

ZSTD is actually used.

Details

Environment

• clickhouse-go version: v2.41.0
• Interface: ClickHouse API, HTTP
• Go version: go1.25.5
• Operating system: Linux
• ClickHouse version: 24.8.15.33588
• Is it a ClickHouse Cloud? no
• ClickHouse Server non-default settings, if any:
• CREATE TABLE statements for tables involved:
• Sample data for all these tables, use clickhouse-obfuscator if necessary