danny0405 commented on a change in pull request #1157: [CALCITE-2969] Improve
design of join-like relational expressions
URL: https://github.com/apache/calcite/pull/1157#discussion_r279149970
##########
File path: core/src/main/java/org/apache/calcite/rel/core/JoinRelType.java
##########
@@ -16,13 +16,61 @@
*/
package org.apache.calcite.rel.core;
+import org.apache.calcite.linq4j.CorrelateJoinType;
+
import java.util.Locale;
/**
* Enumeration of join types.
*/
public enum JoinRelType {
- INNER, LEFT, RIGHT, FULL;
+ /**
+ * Inner join.
+ */
+ INNER,
+
+ /**
+ * Left-outer join.
+ */
+ LEFT,
+
+ /**
+ * Right-outer join.
+ */
+ RIGHT,
Review comment:
We can remove it if we always rewrote a right join to left, but how can we
describe a right join type in the plan ?
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