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new 725b71e5af [CALCITE-5391] JoinOnUniqueToSemiJoinRule should preserve
field names, if possible
725b71e5af is described below
commit 725b71e5af13f2b8725a8da9762c21659c52e507
Author: Scott Reynolds <[email protected]>
AuthorDate: Fri Nov 18 15:12:45 2022 -0800
[CALCITE-5391] JoinOnUniqueToSemiJoinRule should preserve field names, if
possible
Why:
When rewriting the query for a semi join, the
`JoinOnUniqueToSemiJoinRule` pushes a new project via
`RelBuilder`. This project is *almost* a good copy of the original
`Project` -- it is just missing the field names.
How:
This change uses `RelDataType` of the `Project` to get the field names
for the new `Project` pushed on the `Relbuilder` stack. This is
similar to what is done in `SemiJoinRule#perform`
---
.../org/apache/calcite/rel/rules/SemiJoinRule.java | 2 +-
.../org/apache/calcite/test/RelOptRulesTest.java | 15 ++++++++++++
.../org/apache/calcite/test/RelOptRulesTest.xml | 27 ++++++++++++++++++++++
3 files changed, 43 insertions(+), 1 deletion(-)
diff --git a/core/src/main/java/org/apache/calcite/rel/rules/SemiJoinRule.java
b/core/src/main/java/org/apache/calcite/rel/rules/SemiJoinRule.java
index ef2623a710..d6f8941327 100644
--- a/core/src/main/java/org/apache/calcite/rel/rules/SemiJoinRule.java
+++ b/core/src/main/java/org/apache/calcite/rel/rules/SemiJoinRule.java
@@ -283,7 +283,7 @@ public abstract class SemiJoinRule
default:
throw new AssertionError(join.getJoinType());
}
- builder.project(project.getProjects());
+ builder.project(project.getProjects(),
project.getRowType().getFieldNames());
call.transformTo(builder.build());
}
}
diff --git a/core/src/test/java/org/apache/calcite/test/RelOptRulesTest.java
b/core/src/test/java/org/apache/calcite/test/RelOptRulesTest.java
index a1262be913..08dd3edb15 100644
--- a/core/src/test/java/org/apache/calcite/test/RelOptRulesTest.java
+++ b/core/src/test/java/org/apache/calcite/test/RelOptRulesTest.java
@@ -1181,6 +1181,21 @@ class RelOptRulesTest extends RelOptTestBase {
.check();
}
+ /**
+ * Test case of
+ * <a
href="https://issues.apache.org/jira/browse/CALCITE-5391";>[CALCITE-5391]
+ * JoinOnUniqueToSemiJoinRule should preserve field names, if possible</a>.
*/
+ @Test void testSemiJoinRuleWithJoinOnUniqueInputWithAlias() {
+ final String sql = "select emp.deptno as department_id, emp.sal as
salary\n"
+ + "from emp\n"
+ + "where exists(select * from dept where emp.deptno = dept.deptno)";
+ sql(sql)
+ .withDecorrelate(true)
+ .withTrim(true)
+ .withRule(CoreRules.JOIN_ON_UNIQUE_TO_SEMI_JOIN)
+ .check();
+ }
+
/** Test case for
* <a
href="https://issues.apache.org/jira/browse/CALCITE-1495";>[CALCITE-1495]
* SemiJoinRule should not apply to RIGHT and FULL JOIN</a>. */
diff --git
a/core/src/test/resources/org/apache/calcite/test/RelOptRulesTest.xml
b/core/src/test/resources/org/apache/calcite/test/RelOptRulesTest.xml
index 27010f6367..333a84b07d 100644
--- a/core/src/test/resources/org/apache/calcite/test/RelOptRulesTest.xml
+++ b/core/src/test/resources/org/apache/calcite/test/RelOptRulesTest.xml
@@ -12362,6 +12362,33 @@ LogicalJoin(condition=[=($7, $9)], joinType=[semi])
LogicalTableScan(table=[[CATALOG, SALES, EMP]])
LogicalProject(DEPTNO=[$0])
LogicalTableScan(table=[[CATALOG, SALES, DEPT]])
+]]>
+ </Resource>
+ </TestCase>
+ <TestCase name="testSemiJoinRuleWithJoinOnUniqueInputWithAlias">
+ <Resource name="sql">
+ <![CDATA[select emp.deptno as department_id, emp.sal as salary
+from emp
+where exists(select * from dept where emp.deptno = dept.deptno)]]>
+ </Resource>
+ <Resource name="planBefore">
+ <![CDATA[
+LogicalProject(DEPARTMENT_ID=[$1], SALARY=[$0])
+ LogicalJoin(condition=[=($1, $2)], joinType=[inner])
+ LogicalProject(SAL=[$5], DEPTNO=[$7])
+ LogicalTableScan(table=[[CATALOG, SALES, EMP]])
+ LogicalProject(DEPTNO=[$0])
+ LogicalTableScan(table=[[CATALOG, SALES, DEPT]])
+]]>
+ </Resource>
+ <Resource name="planAfter">
+ <![CDATA[
+LogicalProject(DEPARTMENT_ID=[$1], SALARY=[$0])
+ LogicalJoin(condition=[=($1, $2)], joinType=[semi])
+ LogicalProject(SAL=[$5], DEPTNO=[$7])
+ LogicalTableScan(table=[[CATALOG, SALES, EMP]])
+ LogicalProject(DEPTNO=[$0])
+ LogicalTableScan(table=[[CATALOG, SALES, DEPT]])
]]>
</Resource>
</TestCase>
