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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