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https://issues.apache.org/jira/browse/FLINK-5256?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15996818#comment-15996818
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ASF GitHub Bot commented on FLINK-5256:
---------------------------------------
Github user DmytroShkvyra commented on a diff in the pull request:
https://github.com/apache/flink/pull/3673#discussion_r114790408
--- Diff:
flink-libraries/flink-table/src/main/scala/org/apache/flink/table/codegen/generated.scala
---
@@ -35,7 +35,11 @@ case class GeneratedExpression(
resultTerm: String,
nullTerm: String,
code: String,
- resultType: TypeInformation[_])
+ resultType: TypeInformation[_]) {
+
+ var leftNullTerm: String = _
--- End diff --
@fhueske It doesn't work because `${codeGenerator.input1Term}` is Row
` @Override
public void join(Object _in1, Object _in2,
org.apache.flink.util.Collector c) throws Exception {
org.apache.flink.types.Row in1 = (org.apache.flink.types.Row)
_in1;
org.apache.flink.types.Row in2 = (org.apache.flink.types.Row)
_in2;`
But I need know which field in join expression is null
> Extend DataSetSingleRowJoin to support Left and Right joins
> -----------------------------------------------------------
>
> Key: FLINK-5256
> URL: https://issues.apache.org/jira/browse/FLINK-5256
> Project: Flink
> Issue Type: Improvement
> Components: Table API & SQL
> Affects Versions: 1.2.0
> Reporter: Fabian Hueske
> Assignee: Dmytro Shkvyra
>
> The {{DataSetSingleRowJoin}} is a broadcast-map join that supports arbitrary
> inner joins where one input is a single row.
> I found that Calcite translates certain subqueries into non-equi left and
> right joins with single input. These cases can be handled if the
> {{DataSetSingleRowJoin}} is extended to support outer joins on the
> non-single-row input, i.e., left joins if the right side is single input and
> vice versa.
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