@Override
public String toString() {
StringBuilder sb = new StringBuilder();
for (int i = 0, cnt = this.invocations.size(); i < cnt; i++) {
QueryInvocation qi = this.invocations.get(i);
sb.append(String.format("[%02d] %s - #02d / partitions=%s / params=%d\n",
i, qi.stmt.fullName(), qi.counter, qi.partitions, qi.paramsHash));
} // FOR
return (sb.toString());
}