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  1. Calcite
  2. CALCITE-1382

ClassCastException in JDBC Adapter

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    Details

    • Type: Bug
    • Status: Closed
    • Priority: Major
    • Resolution: Fixed
    • Affects Version/s: 1.9.0
    • Fix Version/s: 1.27.0
    • Component/s: core
    • Labels:
    • Environment:

      This bug was detected using a postgresql database and the calcite version 1.9.0.

      Description

      This query:

      SELECT count(*) FROM (SELECT count(emp.empno) `Count Emp`, dept.dname `Department Name` FROM Calcite.emp emp JOIN Calcite.dept dept ON emp.deptno = dept.deptno JOIN Calcite.salgrade salgrade ON emp.comm = salgrade.hisal WHERE dept.dname LIKE '%O%' GROUP BY emp.deptno, dept.dname)
      

      generates a ClassCastException: "org.apache.calcite.adapter.jdbc.JdbcRules$JdbcJoin cannot be cast to org.apache.calcite.adapter.enumerable.EnumerableRel".

      The plan is the following:

      [TABLE, #ID {PLAN=EnumerableAggregate(group=[{}], EXPR$0=[COUNT()])
        EnumerableAggregate(group=[{2, 4}])
          JdbcJoin(condition=[=($1, $0)], joinType=[inner])
            JdbcProject(hisal=[$2])
              JdbcTableScan(table=[[Calcite, salgrade]])
            JdbcJoin(condition=[=($1, $2)], joinType=[inner])
              JdbcProject(comm=[$6], deptno=[$7])
                JdbcTableScan(table=[[Calcite, emp]])
              JdbcProject(deptno=[$0], dname=[$1])
                JdbcFilter(condition=[LIKE($1, '%O%')])
                  JdbcTableScan(table=[[Calcite, dept]])
      , }]
      

      Runnable test:

      /** Test case for
       * <a href="https://issues.apache.org/jira/browse/CALCITE-1382">[CALCITE-1382]
       * ClassCastException in JDBC adapter</a>. */
      @org.junit.Test
      public void testJoinPlan3() throws DataSourceManagerException {
          final String sql = "SELECT count(*) FROM (SELECT count(emp.empno) `Count Emp`, dept.dname `Department Name`\n"
                  + "FROM emp emp JOIN dept dept ON emp.deptno = dept.deptno\n"
                  + "JOIN salgrade salgrade ON emp.comm = salgrade.hisal\n"
                  + "WHERE dept.dname LIKE '%A%' GROUP BY emp.deptno, dept.dname)";
          final String expected = "SELECT COUNT(*) FROM (\n" +
                  "SELECT count(\"emp\".empno) AS \"Count Emp\", \"dept\".dname AS \"Department Name\"\n" +
                  "FROM emp AS \"emp\"\n" +
                  "INNER JOIN (\n" +
                  "SELECT deptno, dname\n" +
                  "FROM dept\n" +
                  "WHERE dname LIKE '%A%'\n" +
                  ") AS \"dept\" ON \"emp\".deptno = \"dept\".deptno\n" +
                  "INNER JOIN (\n" +
                  "SELECT hisal \n" +
                  "FROM salgrade \n" +
                  ") AS \"salgrade\" ON \"emp\".comm = \"salgrade\".hisal " +
                  "GROUP BY \"emp\".deptno, \"dept\".dname" +
                  ") AS \"t\"";
          sql(sql)
                  .schema(CalciteAssert.SchemaSpec.JDBC_SCOTT)
                  .ok(expected);
      }
      

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              • Assignee:
                julianhyde Julian Hyde
                Reporter:
                migueltaoliveira Miguel Oliveira
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                Dates

                • Created:
                  Updated:
                  Resolved: