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https://issues.apache.org/jira/browse/FLINK-3942?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15348829#comment-15348829
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ASF GitHub Bot commented on FLINK-3942:
---------------------------------------
Github user fhueske commented on a diff in the pull request:
https://github.com/apache/flink/pull/2159#discussion_r68474570
--- Diff:
flink-libraries/flink-table/src/main/scala/org/apache/flink/api/table/codegen/CodeGenerator.scala
---
@@ -260,10 +260,14 @@ class CodeGenerator(
val input1AccessExprs = for (i <- 0 until input1.getArity)
yield generateInputAccess(input1, input1Term, i)
- val input2AccessExprs = input2 match {
- case Some(ti) => for (i <- 0 until ti.getArity)
- yield generateInputAccess(ti, input2Term, i)
- case None => Seq() // add nothing
+ val input2AccessExprs = if (input1.getArity < resultFieldNames.length)
{
--- End diff --
Can this change be reverted if we use cogroup and an optional converter
map? Or would you consider this as a bug fix?
> Add support for INTERSECT
> -------------------------
>
> Key: FLINK-3942
> URL: https://issues.apache.org/jira/browse/FLINK-3942
> Project: Flink
> Issue Type: New Feature
> Components: Table API & SQL
> Affects Versions: 1.1.0
> Reporter: Fabian Hueske
> Assignee: Jark Wu
> Priority: Minor
>
> Currently, the Table API and SQL do not support INTERSECT.
> INTERSECT can be executed as join on all fields.
> In order to add support for INTERSECT to the Table API and SQL we need to:
> - Implement a {{DataSetIntersect}} class that translates an INTERSECT into a
> DataSet API program using a join on all fields.
> - Implement a {{DataSetIntersectRule}} that translates a Calcite
> {{LogicalIntersect}} into a {{DataSetIntersect}}.
> - Extend the Table API (and validation phase) to provide an intersect()
> method.
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