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Map<String, List<StudentReportRecordStatisticsListVo>> deptMap = dataList.stream().filter(x -> x.getReportTime() != null && x.getDeptName() != null).collect(Collectors.groupingBy(StudentReportRecordStatisticsListVo::getDeptName));
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Map<String, List<StudentReportRecordStatisticsListVo>> deptMap = dataList.stream().filter(x -> x.getReportTime() != null && x.getDeptName() != null).collect(Collectors.groupingBy(StudentReportRecordStatisticsListVo::getDeptName));
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