pub const GRACE_HASH_JOIN_ENV: &str = "KRISHIV_GRACE_HASH_JOIN";Expand description
Turn the grace hash join on. Absent or not truthy, the engine keeps the sort-merge conversion.
Default-off deliberately: the sort-merge path is what the SF100 sweeps have been measured against, and a new join operator earns its place by beating it on the cluster, not by being newer.