Materialized view in clickhouse database not showing data - database

Question

I use Clickhouse database.
I have text coming in segments. I need to group all text in one row without duplicate segments
when count(segment) = total Segment.
I create the first table to insert the segments.
then I create a MATERIALIZED view to removing duplicate rows and group all segments.
then move it to the second table but my problem is the view does not show the values.
when I run the query it is working fine
First Table :
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 );
Second Table :
CREATE table test_table_2
(
message String,
reference UInt16,
totalSegment UInt16
)
ENGINE = MergeTree()
order by (reference );
MATERIALIZED VIEW :
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 ;
Insert data:
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() );

Answer 1

MV is an insert trigger. It NEVER reads the source table -- test_table_1 !!!
https://den-crane.github.io/Everything_you_should_know_about_materialized_views_commented.pdf
https://youtu.be/ckChUkC3Pns?t=9326