rubenada commented on a change in pull request #2690:
URL: https://github.com/apache/calcite/pull/2690#discussion_r805938047
##########
File path:
core/src/test/java/org/apache/calcite/test/enumerable/EnumerableRepeatUnionTest.java
##########
@@ -233,4 +245,83 @@
.returnsOrdered("i=1", "i=2", "i=null", "i=3", "i=2", "i=3", "i=3");
}
+ /** Test case for
+ * <a
href="https://issues.apache.org/jira/browse/CALCITE-4054";>[CALCITE-4054]
+ * RepeatUnion containing a Correlate with a transientScan on its RHS causes
NPE</a>. */
+ @Test void testRepeatUnionWithCorrelateWithTransientScanOnItsRight() {
+ CalciteAssert.that()
+ .with(CalciteConnectionProperty.LEX, Lex.JAVA)
+ .with(CalciteConnectionProperty.FORCE_DECORRELATE, false)
+ .withSchema("s", new ReflectiveSchema(new HierarchySchema()))
+ .query("?")
+ .withHook(Hook.PLANNER, (Consumer<RelOptPlanner>) planner -> {
+ planner.addRule(JoinToCorrelateRule.Config.DEFAULT.toRule());
+ planner.removeRule(JoinCommuteRule.Config.DEFAULT.toRule());
+ planner.removeRule(EnumerableRules.ENUMERABLE_MERGE_JOIN_RULE);
+ planner.removeRule(EnumerableRules.ENUMERABLE_JOIN_RULE);
+ })
+ .withRel(builder -> {
+ builder
+ // WITH RECURSIVE delta(empid, name) as (
+ // SELECT empid, name FROM emps WHERE empid = 2
+ // UNION ALL
+ // SELECT e.empid, e.name FROM delta d
+ // JOIN hierarchies h ON d.empid =
h.managerid
+ // JOIN emps e ON
h.subordinateid = e.empid
+ // )
+ // SELECT empid, name FROM delta
+ .scan("s", "emps")
+ .filter(
+ builder.equals(
+ builder.field("empid"),
+ builder.literal(2)))
+ .project(
+ builder.field("emps", "empid"),
+ builder.field("emps", "name"))
+
+ .transientScan("#DELTA#");
+ RelNode transientScan = builder.build(); // pop the transientScan to
use it later
+
+ builder
+ .scan("s", "hierarchies")
+ .push(transientScan) // use the transientScan as right input of
the join
+ .join(
+ JoinRelType.INNER,
+ builder.equals(
+ builder.field(2, "#DELTA#", "empid"),
+ builder.field(2, "hierarchies", "managerid")))
+
+ .scan("s", "emps")
+ .join(
+ JoinRelType.INNER,
+ builder.equals(
+ builder.field(2, "hierarchies", "subordinateid"),
+ builder.field(2, "emps", "empid")))
+ .project(
+ builder.field("emps", "empid"),
+ builder.field("emps", "name"))
+ .repeatUnion("#DELTA#", true);
+ return builder.build();
+ })
+ .explainHookMatches(""
+ + "EnumerableRepeatUnion(all=[true])\n"
+ + " EnumerableTableSpool(readType=[LAZY], writeType=[LAZY],
table=[[#DELTA#]])\n"
+ + " EnumerableCalc(expr#0..4=[{inputs}], expr#5=[2],
expr#6=[=($t0, $t5)], empid=[$t0], name=[$t2], $condition=[$t6])\n"
+ + " EnumerableTableScan(table=[[s, emps]])\n"
+ + " EnumerableTableSpool(readType=[LAZY], writeType=[LAZY],
table=[[#DELTA#]])\n"
+ + " EnumerableCalc(expr#0..8=[{inputs}], empid=[$t4],
name=[$t6])\n"
+ + " EnumerableCorrelate(correlation=[$cor1],
joinType=[inner], requiredColumns=[{1}])\n"
+ // It is important to have EnumerableCorrelate + #DELTA# table
scan on its right
Review comment:
Added clarification in the comment
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