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https://issues.apache.org/jira/browse/FLINK-30830?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Danny Cranmer resolved FLINK-30830.
-----------------------------------
Resolution: Fixed
> Temporal Table Function Samples for Java Do Not Work As-Is, And Some
> Functions Are Deprecated
> ---------------------------------------------------------------------------------------------
>
> Key: FLINK-30830
> URL: https://issues.apache.org/jira/browse/FLINK-30830
> Project: Flink
> Issue Type: Improvement
> Components: Table SQL / API
> Affects Versions: 1.16.1
> Reporter: Jeremy Ber
> Assignee: Jeremy Ber
> Priority: Minor
> Labels: developer-experience, pull-request-available
> Fix For: 1.17.0
>
> Original Estimate: 24h
> Remaining Estimate: 24h
>
> In the java documentation for the [Temporal Table
> Function|https://nightlies.apache.org/flink/flink-docs-master/docs/dev/table/concepts/temporal_table_function/],
> there are two issues with the APIs as-is.
> * Defining the temporal table calls `tEnv.registerFunction` which is a
> deprecated API since v1.11, favoring `createTemporarySystemFunction` instead.
> * In the Temporal Table Function Join syntax, calling
> `joinLateral($("rates(order_time)")` elicits the following error:
>
> {{Cannot resolve field [rates(order_time)] }}
>
>
> For point 1, I am proposing we replace `tEnv.registerFunction()` with
> `tEnv.createTemporarySystemFunction`.
>
> For point 2, I am proposing we replace:
>
>
> {{{}Table result = orders{}}}{{{}.joinLateral($("rates(order_time)"),
> $("orders.currency = rates.currency")){}}}{{{}.select($("(o_amount *
> r_rate).sum as amount"));{}}}
>
> with
>
> {{{}Table result = orders.joinLateral(call("rates", $("o_proctime")),
> $("o_currency").isEqual($("r_currency"))){}}}{{{}.select($("(o_amount").times($("r_rate")).sum().as("amount"));
> {}}}
>
> {{Sources for corrections:}}
> *
> {{[https://nightlies.apache.org/flink/flink-docs-release-1.11/api/java/org/apache/flink/table/api/TableEnvironment.html#registerFunction-java.lang.String-org.apache.flink.table.functions.ScalarFunction-]}}
> *
> {{{}[https://nightlies.apache.org/flink/flink-docs-master/docs/dev/table/tableapi/#join-with-temporal-table]{}}}{{{{}}{}}}
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