presto-main/src/main/java/io/prestosql/execution/QueryManagerConfig.java/QueryManagerConfig/setQueryManagerExecutorPoolSize
class QueryManagerConfig:    @Config("query.manager-executor-pool-size")
    public QueryManagerConfig setQueryManagerExecutorPoolSize(int queryManagerExecutorPoolSize)
    {
        this.queryManagerExecutorPoolSize = queryManagerExecutorPoolSize;
        return this;
    }