JNSimba opened a new pull request, #61:
URL: https://github.com/apache/doris-flink-connector/pull/61
# Proposed changes
Issue Number: close #xxx
## Problem Summary:
At present, the data of the flink stream join doris table is to read the
doris table into the memory at one time and join it, such as kafka join doris.
This makes it impossible to read the newly added data of the doris table.
Therefore, lookup join is supported on the flink doris connector. The
principle is to search in doris in real time according to the data in the fact
stream.
tips:
For query performance, the cache setting is supported, which is disabled by
default.
`lookup.cache.max-rows` //The maximum row of the cache
`lookup.cache.ttl`. //cache's ttl
`lookup.max-retries`. //The maximum number of retries to read doris
example:
```sql
CREATE TABLE fact_table (
`id` BIGINT,
`name` STRING,
`city` STRING,
`process_time` as proctime()
) WITH (
'connector' = 'kafka',
'topic' = 'test_lookup',
'properties.bootstrap.servers' = '127.0.0.1:9092',
'properties.group.id' = 'testGroup',
'scan.startup.mode' = 'earliest-offset',
'format' = 'csv'
);
create table dim_city(
`city` STRING,
`level` INT ,
`province` STRING,
`country` STRING
) WITH (
'connector' = 'doris',
'fenodes' = '127.0.0.1:8030',
'table.identifier' = 'test.dim_city',
'username' = 'root',
'password' = '',
'lookup.cache.max-rows' = '1000',
'lookup.cache.ttl' = '60000'
);
SELECT a.id, a.name, a.city, c.province, c.country,c.level
FROM fact_table a
left join dim_city FOR SYSTEM_TIME AS OF a.process_time AS c
ON a.city = c.city
```
## Checklist(Required)
1. Does it affect the original behavior: (Yes/No/I Don't know)
2. Has unit tests been added: (Yes/No/No Need)
3. Has document been added or modified: (Yes/No/No Need)
4. Does it need to update dependencies: (Yes/No)
5. Are there any changes that cannot be rolled back: (Yes/No)
## Further comments
If this is a relatively large or complex change, kick off the discussion at
[[email protected]](mailto:[email protected]) by explaining why you
chose the solution you did and what alternatives you considered, etc...
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