Method insert_version_set

nodedb/src/control/gateway/plan_cache.rs:211–214

Store a `GatewayVersionSet` for a SQL key. Called by `execute_sql` after a cache miss so the next call can do the two-phase lookup without re-planning.

(&self, sql_key: SqlKey, version_set: GatewayVersionSet)

    /// Called by `execute_sql` after a cache miss so the next call can do the
    /// two-phase lookup without re-planning.
    pub fn insert_version_set(&self, sql_key: SqlKey, version_set: GatewayVersionSet) {
        let mut inner = self.inner.lock().unwrap_or_else(|p| p.into_inner());
        inner.version_set_index.insert(sql_key, version_set);
    }

    /// Number of cached plans.
    pub fn len(&self) -> usize {