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https://issues.apache.org/jira/browse/FLINK-11067?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16721330#comment-16721330
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Timo Walther commented on FLINK-11067:
--------------------------------------
Sorry, [~dian.fu] and [~sunjincheng121] I forgot that {{BatchTableEnvironment}}
and {{StreamTableEnvironment}} are also in different packages. Yes, I think
[~dawidwys] suggestion is a better solution with a common base class in
{{flink-table-api-base}}. In summary:
// in flink-tabe-api-base
interface BaseTableEnvironment {
// methods independent of batch/streaming or Java/Scala
// contains main logic for within the table ecosystem
// (reading from table sources and writing to table sinks)
}
// in flink-table-api-java package
interface TableEnvironment extends BaseTableEnvironment{
// only methods for creating a table environment in Java!
static BatchTableEnvironment getTableEnvironment(ExecutionEnvironment
env);
static StreamTableEnvironment
getTableEnvironment(StreamExecutionEnvironment env);
// and methods specific for Java i.e. UDF registration
}
interface BatchTableEnvironment extends TableEnvironment {
// methods specific for batch and Java (toDataSet, fromDataSet)
}
interface StreamTableEnvironment extends TableEnvironment {
// methods specific for streaming and Java (toRetractStream, ...)
}
// in flink-table-api-scala package
interface TableEnvironment extends BaseTableEnvironment {
// only methods for creating a table environment in Scala!
static BatchTableEnvironment getTableEnvironment(ExecutionEnvironment
env);
static StreamTableEnvironment
getTableEnvironment(StreamExecutionEnvironment env);
// and methods specific for Scala i.e. UDF registration
}
interface BatchTableEnvironment extends TableEnvironment {
// methods specific for batch and Scala (toDataSet, fromDataSet)
}
interface StreamTableEnvironment extends TableEnvironment {
// methods specific for streaming and Scala (toRetractStream, ...)
}
What do you think?
> Port TableEnvironments to Java
> ------------------------------
>
> Key: FLINK-11067
> URL: https://issues.apache.org/jira/browse/FLINK-11067
> Project: Flink
> Issue Type: Sub-task
> Components: Table API & SQL
> Reporter: Timo Walther
> Assignee: Dawid Wysakowicz
> Priority: Major
>
> This task includes porting {{TableEnvironment}}, {{StreamTableEnvironment}},
> {{BatchTableEnvironment}} to Java. API-breaking changes need to be avoided
> and discussed. Some refactoring and clean up might be necessary.
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