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Posted to dev@flink.apache.org by "Yunfeng Zhou (Jira)" <ji...@apache.org> on 2022/12/05 01:22:00 UTC

[jira] [Created] (FLINK-30292) Better support for conversion between DataType and TypeInformation

Yunfeng Zhou created FLINK-30292:
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             Summary: Better support for conversion between DataType and TypeInformation
                 Key: FLINK-30292
                 URL: https://issues.apache.org/jira/browse/FLINK-30292
             Project: Flink
          Issue Type: Improvement
          Components: Table SQL / API
    Affects Versions: 1.15.3
            Reporter: Yunfeng Zhou


In Flink 1.15, we have the following ways to convert a DataType to a TypeInformation. Each of them has some disadvantages.

* `TypeConversions.fromDataTypeToLegacyInfo`
It might lead to precision losses in face of some data types like timestamp.
It has been deprecated.
* `ExternalTypeInfo.of`
It cannot be used to get detailed type information like `RowTypeInfo`
It might bring some serialization overhead.

Given that the ways mentioned above are both not perfect,  Flink SQL should provide a better API to support DataType-TypeInformation conversions, and thus better support Table-DataStream conversions.
 



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