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https://issues.apache.org/jira/browse/FLINK-10379?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16623471#comment-16623471
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Piotr Nowojski commented on FLINK-10379:
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Thanks [~hequn8128] :)
Probably we should first also think about how to solve this. Do you have some
specific solution in mind?
I wasn't taking part of the discussion/effort that resulted in removing
{{Table#join(String)}} method, but there were probably some reasons behind
that. I heard that part of it was to switch to using implicit conversions of
table functions to {{Table}} instances in Scala. Obviously that doesn't work,
but maybe we could provide something to explicitly apply argument to
{{TableFunction}} instance and convert it to {{Table}}? Something along the
lines:
{code:java}
// Register the function.
TableFunction<Row> split = tableEnv.registerFunction("split", new Split("#"));
myTable.join(split.apply("a").as("word, length"));
{code}
(But I'm pretty unfamiliar with Table API, so treat this with grain of salt)
What do you think?
> Can not use Table Functions in Java Table API
> ---------------------------------------------
>
> Key: FLINK-10379
> URL: https://issues.apache.org/jira/browse/FLINK-10379
> Project: Flink
> Issue Type: Bug
> Components: Table API & SQL
> Affects Versions: 1.6.1
> Reporter: Piotr Nowojski
> Assignee: Hequn Cheng
> Priority: Critical
>
> As stated in the
> [documentation|[https://ci.apache.org/projects/flink/flink-docs-stable/dev/table/udfs.html#table-functions],]
> this is how table functions should be used in Java Table API:
> {code:java}
> // Register the function.
> tableEnv.registerFunction("split", new Split("#"));
> myTable.join("split(a) as (word, length)");
> {code}
> However {{Table.join(String)}} was removed sometime ago and now it is
> impossible to use Table Functions in Java Table API.
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