Doris should support stored procedures [Feature]

[King0513]

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Description

Doris should support stored procedures。 MySQL 8.x 开始支持存储过程，PostgreSQL和Greenplum等MPP数据库都支持存储过程，传统的Oracle、DB2以及流行的Hana也都支持存储过程。存储过程在OLAP领域有非常重要的应用，所以我认为Doris也应该考虑后续补充存储过程的功能。

Use case

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Related issues

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Are you willing to submit PR?

• [X] Yes I am willing to submit a PR!

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[xbj137661413]

I also think that...

[beeflyme]

mk