jinfengni commented on code in PR #3640:
URL: https://github.com/apache/calcite/pull/3640#discussion_r1499590342
##########
core/src/test/java/org/apache/calcite/test/JdbcTest.java:
##########
@@ -8270,6 +8270,75 @@ private void checkGetTimestamp(Connection con) throws
SQLException {
.returns("EXPR$0=[1, 1.1]\n");
}
+ /** Test case for
+ * <a
href="https://issues.apache.org/jira/browse/CALCITE-6032";>[CALCITE-6032]
+ * NullPointerException in Reldecorrelator for a Multi level correlated
subquery</a>. */
+ @Test void testMultiLevelDecorrelation() throws Exception {
+ String hsqldbMemUrl = "jdbc:hsqldb:mem:.";
+ Connection baseConnection = DriverManager.getConnection(hsqldbMemUrl);
+ Statement baseStmt = baseConnection.createStatement();
+ baseStmt.execute("create table invoice (inv_id integer, col1\n"
+ + "integer, inv_amt integer)");
+ baseStmt.execute("create table item(item_id integer, item_amt\n"
+ + "integer, item_col1 integer, item_col2 integer, item_col3\n"
+ + "integer,item_col4 integer )");
+ baseStmt.execute("INSERT INTO invoice VALUES (1, 1, 1)");
+ baseStmt.execute("INSERT INTO invoice VALUES (2, 2, 2)");
+ baseStmt.execute("INSERT INTO invoice VALUES (3, 3, 3)");
+ baseStmt.execute("INSERT INTO item values (1, 1, 1, 1, 1, 1)");
+ baseStmt.execute("INSERT INTO item values (2, 2, 2, 2, 2, 2)");
+ baseStmt.close();
+ baseConnection.commit();
+
+ Properties info = new Properties();
+ info.put("model",
+ "inline:"
+ + "{\n"
+ + " version: '1.0',\n"
+ + " defaultSchema: 'BASEJDBC',\n"
+ + " schemas: [\n"
+ + " {\n"
+ + " type: 'jdbc',\n"
+ + " name: 'BASEJDBC',\n"
+ + " jdbcDriver: '" + jdbcDriver.class.getName() + "',\n"
+ + " jdbcUrl: '" + hsqldbMemUrl + "',\n"
+ + " jdbcCatalog: null,\n"
+ + " jdbcSchema: null\n"
+ + " }\n"
+ + " ]\n"
+ + "}");
+
+ Connection calciteConnection =
+ DriverManager.getConnection("jdbc:calcite:", info);
+
+ String statement = "SELECT Sum(invoice.inv_amt * (\n"
Review Comment:
Can we simply the query to reproduce the issue? Remove the unnecessary part
that is not related to de-correlation logic.
I tried the following query, using `foodmart`, and seems it hit the similar
stack trace.
```
SELECT SUM(p."min_scale" * (
select max(e."salary" + e."salary")
from FOODMART."employee" e
where e."position_id" = p."position_id"
AND e."supervisor_id" = (select MAX(e2."supervisor_id")
from FOODMART."employee" e2
WHERE e."position_id" <= p."position_id"
AND e."last_name" = e2."last_name")
)), count(*) as cnt
from FOODMART."position" p;
```
```
Error: Error while executing SQL "SELECT SUM(p."min_scale" * (
select max(e."salary" + e."salary")
from FOODMART."employee" e
where e."position_id" = p."position_id"
AND e."supervisor_id" = (select MAX(e2."supervisor_id")
from FOODMART."employee" e2
WHERE e."position_id" <= p."position_id"
AND e."last_name" = e2."last_name")
)), count(*) as cnt
from FOODMART."position" p": cm.mapCorToCorRel.get($cor2) (state=,code=0)
```
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