“DB::Exception: RangeReader read 7523 rows, but 7550 expected”异常在clickhouse中是啥意思？

Posted 2023-03-25

【中文标题】“DB::Exception: RangeReader read 7523 rows, but 7550 expected”异常在clickhouse中是啥意思？

【英文标题】：What does "DB::Exception: RangeReader read 7523 rows, but 7550 expected" exception mean in clickhouse?“DB::Exception: RangeReader read 7523 rows, but 7550 expected”异常在clickhouse中是什么意思？

【发布时间】：2020-02-03 11:42:44

【问题描述】：

查询：

SELECT * FROM reporting_events WHERE (device_id = 51);

结果：

DB::Exception: RangeReader read 7523 rows, but 7550 expected..

表：

CREATE TABLE reporting_events (
  id UInt64,
  a UInt32,
  b UInt64,
  c UInt32,
  d DEFAULT 0,
  e UInt32 DEFAULT 0,
  device_id UInt32,
  ts DateTime DEFAULT now(),
  name String,
  type Enum8('ONLINE'      = 0,
             'OFFLINE'     = 1,
             'INFORMATION' = 2,
             'WARNING'     = 3,
             'CRITICAL'    = 4),
  description String
)
ENGINE = MergeTree()
PARTITION BY toYYYYMM(ts)
ORDER BY (a, b, e, device_id, ts, type)
TTL ts + INTERVAL 6 MONTH;

Clickhouse 版本 20.1.3.7。

【问题讨论】：

Dmitriy，您能否将引用添加到您的 github 问题？谢谢

github问题：github.com/ClickHouse/ClickHouse/issues/8964

【参考方案1】：

这是一个 CH 错误。现在从 20.1.5 版本开始修复 - https://github.com/ClickHouse/ClickHouse/issues/8964