Support for arrayJoin function
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type/feature-request
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- Go
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Description
## Feature Request
We have a database migrated from clickhouse to tidb, And I just found these is no suitable built-in replacement for arrayJoin function.
**Describe the feature you'd like:**
[https://clickhouse.com/docs/en/sql-reference/functions/array-join](https://clickhouse.com/docs/en/sql-reference/functions/array-join)
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