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https://issues.apache.org/jira/browse/FLINK-21872?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Timo Walther closed FLINK-21872.
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Fix Version/s: 1.13.0
Resolution: Fixed
Fixed in 1.13.0: 619ad4bd0fc522c14952ba2e9c37c3fd0099053b
> Create a utility to create DataStream API's DataType and Schema
> ---------------------------------------------------------------
>
> Key: FLINK-21872
> URL: https://issues.apache.org/jira/browse/FLINK-21872
> Project: Flink
> Issue Type: Sub-task
> Components: Table SQL / API
> Reporter: Timo Walther
> Assignee: Timo Walther
> Priority: Major
> Labels: pull-request-available
> Fix For: 1.13.0
>
>
> FLIP-136 defines the following behavior that should be supported by such a
> utility:
> * Since the type system of Table API is more powerful than DataStream API
> that uses TypeExtraction, it enables replacing GenericTypeInfo with a more
> meaningful DataType. E.g. for supporting immutable POJOs as StructuredType
> instead of RawType. Or Lists as ArrayTypes instead of RawTypes.
> * We will perform verification based on what is available in TypeInformation.
> * Type coercion between an explicitly specified Schema and DataStream will
> not happen (e.g. DataStream<Integer> != Schema.column("f",
> DataTypes.BIGINT())). Because the user specified the desired data type
> explicitly and expects correctness.
> * It allows to define a `system_rowtime` attribute for using the
> StreamRecord's timestamp and existing watermarks.
> * It allows to reorder fields and thus has similar functionality as the
> Expression-based API before but with a more consistent API.
> * Users can place the definition time attributes at arbitrary locations
> between existing fields.
> * We can give time attributes a name in the same way as in regular DDL.
> * By using `{{system_rowtime().as("rowtime")}}` the watermark would be
> assigned implicitly.
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