clickhouse数据库中的物化视图不显示数据答案

【问题标题】：Materialized view in clickhouse database not showing dataclickhouse数据库中的物化视图不显示数据
【发布时间】：2021-04-17 10:47:19
【问题描述】：

我使用 Clickhouse 数据库。

我有分段输入的文本。我需要将所有文本分组在一行中，没有重复的段

当count(segment) = total Segment。

我创建了第一个表来插入段。然后我创建一个 MATERIALIZED 视图来删除重复的行并对所有段进行分组。

然后将其移至第二个表，但我的问题是视图不显示值。当我运行查询时，它工作正常

第一个表：

CREATE table test_table_1
( 
    id UInt16,
    text String,
    totalSegment UInt16,
    segmentNumber UInt16,
    reference UInt16,
    insertTime DateTime
)
ENGINE = ReplacingMergeTree()
order by (id , text , totalSegment , segmentNumber , reference );

第二张桌子：

CREATE table test_table_2
(
    message String,
    reference UInt16,
    totalSegment UInt16
)
ENGINE = MergeTree()
order by (reference );

实体化视图：

CREATE MATERIALIZED VIEW consumer To test_table_2
as
SELECT  groupArray(text) as message ,reference ,totalSegment 
from ( 
    select * 
    from 
    ( 
        SELECT COUNT(*) as countSegment, totalSegment, reference 
        from test_table_1
        where (text,totalSegment,reference,insertTime) in (
                    select    text,totalSegment,reference, max(insertTime) as insertTime 
                    from      test_table_1 
                    group by  text,totalSegment,segmentNumber,reference
        )
        group by  totalSegment, reference
        HAVING count(*) = totalSegment 
        )as a
        left join (
                select    text,segmentNumber,reference, max(insertTime) as insertTime 
                from      test_table_1 
                group by  text,segmentNumber,reference
        )as b using (reference)
        order by segmentNumber 
    )
grousp by reference ,totalSegment
order by reference ;

插入数据：

INSERT INTO test_table_1 (id,text, totalSegment, segmentNumber, reference,insertTime) VALUES(1, 'A1 ', 3, 1, '101', now() );
INSERT INTO test_table_1 (id,text, totalSegment, segmentNumber, reference,insertTime) VALUES(2, 'B1 ', 2, 1, '202', now() );
INSERT INTO test_table_1 (id,text, totalSegment, segmentNumber, reference,insertTime) VALUES(3, 'C2 ', 3, 2, '303', now() );
INSERT INTO test_table_1 (id,text, totalSegment, segmentNumber, reference,insertTime) VALUES(4, 'A3 ', 3, 3, '101', now() );
INSERT INTO test_table_1 (id,text, totalSegment, segmentNumber, reference,insertTime) VALUES(5, 'A2 ', 3, 2, '101', now() );
INSERT INTO test_table_1 (id,text, totalSegment, segmentNumber, reference,insertTime) VALUES(6, 'C1 ', 3, 1, '303', now() );
INSERT INTO test_table_1 (id,text, totalSegment, segmentNumber, reference,insertTime) VALUES(7, 'C3 ', 3, 3, '303', now() );
INSERT INTO test_table_1 (id,text, totalSegment, segmentNumber, reference,insertTime) VALUES(8, 'B2 ', 2, 2, '202', now() );

【问题讨论】：

标签： database clickhouse materialized-views