查询物化视图返回的数据比本地表多

问题描述

当我查询一个物化视图时，我得到的数据多于它所基于的本地表。有什么问题吗？

查询 mv search_uv_minute_level：

    toYYYYMMDD(stime) AS dt,uniqExactMerge(imp_uv) AS imp_uv,uniqExactMerge(clk_uv) AS clk_uv,uniqExactMerge(imp_count) AS imp_count,sumMerge(clk_count) AS clk_count
FROM search_uv_minute_level
WHERE (toYYYYMMDD(stime) = 20210623) AND (toYYYYMMDDhhmmss(stime) >= 20210623150500) AND (toYYYYMMDDhhmmss(stime) <= 20210623150800)
GROUP BY toYYYYMMDD(stime)

┌───────dt─┬─imp_uv─┬─clk_uv─┬─imp_count─┬─clk_count─┐
│ 20210623 │ 114108 │  66320 │    179590 │    110870 │
└──────────┴────────┴────────┴───────────┴───────────┘

查询本地表search_action_dwd：

SELECT 
    toYYYYMMDD(dt) AS t,uniqExact(IF(type = 'IMP',uid,NULL)) AS uv,uniqExact(IF(type = 'CLK',NULL)) AS clk_uv,e,NULL)) AS imp,SUM(IF(type = 'CLK',1,0)) AS clk
FROM search_action_dwd
WHERE (toYYYYMMDD(dt) = 20210623) AND (toYYYYMMDDhhmmss(dt) >= 20210623150500) AND (toYYYYMMDDhhmmss(dt) <= 20210623150800)
GROUP BY t

┌────────t─┬────uv─┬─clk_uv─┬────imp─┬───clk─┐
│ 20210623 │ 92755 │  54265 │ 141838 │ 87337 │
└──────────┴───────┴────────┴────────┴───────┘

MV 定义：

CREATE MATERIALIZED VIEW qiso_bi.search_uv_minute_level (`stime` DateTime('Asia/Shanghai'),`imp_uv` AggregateFunction(uniqExact,String),`clk_uv` AggregateFunction(uniqExact,`imp_count` AggregateFunction(uniqExact,`clk_count` AggregateFunction(sum,UInt8)) ENGINE = ReplicatedAggregatingMergeTree('/clickhouse/tables/{cluster}/{shard}/search_uv_minute_level','{replica}') PARTITION BY toYYYYMMDD(stime) ORDER BY toYYYYMMDDhhmmss(stime) SETTINGS index_granularity = 8192 AS SELECT toStartOfMinute(dt) AS stime,uniqExactState(IF(type = 'IMP',NULL)) AS imp_uv,uniqExactState(IF(type = 'CLK',NULL)) AS imp_count,sumState(IF(type = 'CLK',0)) AS clk_count FROM search_action_dwd WHERE toYYYYMMDD(dt) >= 20210623 GROUP BY toStartOfMinute(dt)

解决方法

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