jinxing64 commented on a change in pull request #1468: [CALCITE-3366]
RelDecorrelator supports Union
URL: https://github.com/apache/calcite/pull/1468#discussion_r329061758
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File path: core/src/test/java/org/apache/calcite/test/RelOptRulesTest.java
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@@ -6349,6 +6349,47 @@ private MyProjectRule(Class<? extends Project> clazz,
String planAfter = NL + RelOptUtil.toString(relAfter);
getDiffRepos().assertEquals("planAfter", "${planAfter}", planAfter);
}
+
+ @Test public void testDecorrelateUnion0() {
+ final String sql = ""
+ + "SELECT deptno FROM dept where exists\n"
+ + "(SELECT 1 FROM emp where sal < 100 and emp.deptno=dept.deptno\n"
+ + "UNION ALL\n"
+ + "SELECT 1 FROM emp where sal > 200 and emp.deptno=dept.deptno)";
+ sql(sql)
+ .withLateDecorrelation(true)
+ .withTrim(true)
+ .with(HepProgram.builder().build())
+ .check();
+ }
+
+ @Test public void testDecorrelateUnion1() {
+ // Decorrelation would fail because the input frames of Union
+ // cannot match by row schema.
+ final String sql = "SELECT * FROM emp A where (deptno, sal) in \n"
+ + "(SELECT deptno, sal FROM emp\n"
+ + "UNION ALL\n"
+ + "SELECT deptno, sal FROM emp B where A.mgr = B.empno)";
Review comment:
Yes, I should resolve the limitation.
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