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https://issues.apache.org/jira/browse/FLINK-6039?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15923836#comment-15923836
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Fabian Hueske commented on FLINK-6039:
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Can you explain the semantics if the returned rows are too short or too long?
I'm also not sure if this should be the default behavior or whether we should
rather add a special type of {{TableFunction}} for this.
> Row of TableFunction should support flexible number of fields
> -------------------------------------------------------------
>
> Key: FLINK-6039
> URL: https://issues.apache.org/jira/browse/FLINK-6039
> Project: Flink
> Issue Type: Improvement
> Reporter: Zhuoluo Yang
> Assignee: Zhuoluo Yang
>
> In actual world, especially while processing logs with TableFunction. The
> formats of the logs in actual world are flexible. Thus, the number of fields
> should not be fixed.
> For examples, we should make the three following types of of TableFunction
> work.
> {code}
> // Test for incomplete row
> class TableFunc4 extends TableFunction[Row] {
> def eval(str: String): Unit = {
> if (str.contains("#")) {
> str.split("#").foreach({ s =>
> val row = new Row(3)
> row.setField(0, s) // And we only set values for one column
> collect(row)
> })
> }
> }
> override def getResultType: TypeInformation[Row] = {
> new RowTypeInfo(BasicTypeInfo.STRING_TYPE_INFO,
> BasicTypeInfo.INT_TYPE_INFO,
> BasicTypeInfo.INT_TYPE_INFO)
> }
> }
> // Test for incomplete row
> class TableFunc5 extends TableFunction[Row] {
> def eval(str: String): Unit = {
> if (str.contains("#")) {
> str.split("#").foreach({ s =>
> val row = new Row(1) // ResultType is three columns, we have only
> one here
> row.setField(0, s)
> collect(row)
> })
> }
> }
> override def getResultType: TypeInformation[Row] = {
> new RowTypeInfo(BasicTypeInfo.STRING_TYPE_INFO,
> BasicTypeInfo.INT_TYPE_INFO,
> BasicTypeInfo.INT_TYPE_INFO)
> }
> }
> // Test for overflow row
> class TableFunc6 extends TableFunction[Row] {
> def eval(str: String): Unit = {
> if (str.contains("#")) {
> str.split("#").foreach({ s =>
> val row = new Row(5) // ResultType is two columns, we have five
> columns here
> row.setField(0, s)
> row.setField(1, s.length)
> row.setField(2, s.length)
> row.setField(3, s.length)
> row.setField(4, s.length)
> collect(row)
> })
> }
> }
> override def getResultType: TypeInformation[Row] = {
> new RowTypeInfo(BasicTypeInfo.STRING_TYPE_INFO,
> BasicTypeInfo.INT_TYPE_INFO)
> }
> }
> {code}
> Actually, the TableFunc4 and TableFunc6 has already worked correctly with
> current version. This issue will make TableFunc5 works.
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