[ https://issues.apache.org/jira/browse/FLINK-22451?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17332475#comment-17332475 ]
Yi Tang edited comment on FLINK-22451 at 4/26/21, 2:53 PM: ----------------------------------------------------------- [~jark] When i try to provide an implementation, i find a pair of functions {{withColumns}} and {{withoutColumns}}. I wonder whether they are just doing something similar? was (Author: yittg): [~jark] When i try to provide a implementation, i find a pair of functions {{withColumns}} and {{withoutColumns}}. I wonder whether they are just doing something similar? > Support (*) as parameter of table UserDefinedFunction > ------------------------------------------------------ > > Key: FLINK-22451 > URL: https://issues.apache.org/jira/browse/FLINK-22451 > Project: Flink > Issue Type: Improvement > Components: Table SQL / API > Reporter: Yi Tang > Assignee: Yi Tang > Priority: Minor > Labels: pull-request-available > > For now, one can use star \(*) to act as a wild card, selecting all of the > columns in the table. > {code:java} > Table result = orders.select($("*")); > {code} > When one use a star \(*) as parameter of an UDF, it will fail > {{ReferenceResolverRule}} in on > {code:java} > "Cannot resolve field [*], input field list:[...]." > {code} > The cause is that, the parameter of an UDF is not expanded in > {{StarReferenceFlatteningRule}} > I think we can support to expand the star parameter to the real fields list > if it is the only parameter(the last parameter is also ok) of the UDF. > then the parameters can be received by > {code:java} > eval(@DataTypeHint(inputGroup = InputGroup.ANY) Object... row) > {code} -- This message was sent by Atlassian Jira (v8.3.4#803005)