[Feature][Flink] Support Decimal Type with configurable precision and scale#5419
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There are 3 failed jobs about zeta, please re-run failed jobs. @liugddx |
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@liugddx @TyrantLucifer PTAL |
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@s7monk PTAL |
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Please fix conflicts. |
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I have fixed confilcts. PTAL @EricJoy2048 |
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all-connectors-it-7 build failure, please re-run failed jobs. @EricJoy2048 |
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Purpose of this pull request
Motivation
Flink has two type systems: TypeInformation of DataSet/DataStream API, and LogicType of Table & SQL API. TypeInformation has some shortcomings. For example, precision and scale can not be defined for DECIMALs.
SeaTunnel has implemented a translation layer based on DataStream, which used TypeInformation type system.
Solution
To support configurable decimal type, there are two solutions.
1st SolutionThe 1st solution requires rewriting the translation layer based on Table & SQL API. But it will consume a lot of work and cause many code changes.
2nd Solution[Adopt]
The 2nd solution adopts the idea of type mapping and uses the String type as the carrier medium of Decimal. SeaTunnel restores the Decimal type field from String before processing the data, and converts the Decimal type field into String after completing the data processing. Because it cannot be inferred from the String type field of typeinformation whether it is a Decimal type field, this solution temporarily stores
SeaTunnelRowTypeto bypass the type conversion betweenTypeInformationandSeaTunnelDataType.Because this solution does not require too much work and can guarantee the stability of the source code, I will adopt it.
Check list
New License Guide
release-note.