Examples of org.apache.derbyTesting.junit.RuntimeStatisticsParser.usedSpecificIndexForIndexScan()

Class org.apache.derbyTesting.junit.RuntimeStatisticsParser

Examples of org.apache.derbyTesting.junit.RuntimeStatisticsParser.usedSpecificIndexForIndexScan()

org.apache.derbyTesting.junit.RuntimeStatisticsParser.usedSpecificIndexForIndexScan()
@param tableName @param indexName @return true if passed indexName was used for Index Scan ResultSet for the passed tableName

            st.executeQuery("select * from t1" +
                " --derby-properties index = t1_c1\n" +  
                "where c1 = c1"), FULL_TABLE);
        RuntimeStatisticsParser rtsp = 
            SQLUtilities.getRuntimeStatisticsParser(st);
        assertTrue(rtsp.usedSpecificIndexForIndexScan("T1", "T1_C1"));
        
        JDBC.assertFullResultSet(
            st.executeQuery("select * from t1" +
                " --derby-properties index = t1_c1\n" +  
                "where c1 = c2"), FULL_TABLE);

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        JDBC.assertFullResultSet(
            st.executeQuery("select * from t1" +
                " --derby-properties index = t1_c1\n" +  
                "where c1 = c2"), FULL_TABLE);
        rtsp = SQLUtilities.getRuntimeStatisticsParser(st);
        assertTrue(rtsp.usedSpecificIndexForIndexScan("T1", "T1_C1"));
        
        JDBC.assertFullResultSet(
            st.executeQuery("select * from t1" +
                " --derby-properties index = t1_c1\n" +  
                "where c1 + 1 = 1 + c1"), FULL_TABLE);

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        JDBC.assertFullResultSet(
            st.executeQuery("select * from t1" +
                " --derby-properties index = t1_c1\n" +  
                "where c1 + 1 = 1 + c1"), FULL_TABLE);
        rtsp = SQLUtilities.getRuntimeStatisticsParser(st);
        assertTrue(rtsp.usedSpecificIndexForIndexScan("T1", "T1_C1"));
        
        st.close();
    }
    
    public void testNestedLoopJoinStrategy()

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        // sorting.
        rs = s.executeQuery("select * from (select i from ts order by i)tt");
        rtsp = SQLUtilities.getRuntimeStatisticsParser(s);


        // Verify that we use the index scan here and no sorting is incurred
        assertTrue(rtsp.usedSpecificIndexForIndexScan("TS","T_I"));
        assertFalse(rtsp.whatSortingRequired());


        s.execute("call SYSCS_UTIL.SYSCS_SET_RUNTIMESTATISTICS(0)");
        rollback();
    }

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            if (expectedScan.equals("Table"))
                    assertTrue(rtsp.usedTableScan());
            else if (expectedScan.equals("Index"))
            {
                assertTrue(rtsp.usedIndexScan());
                assertTrue(rtsp.usedSpecificIndexForIndexScan(
                        expTableInIndexScan, expIndexInIndexScan));
            }
            else if (expectedScan.equals("Constraint"))
            {
                assertTrue(rtsp.usedIndexScan());

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    ps = prepareStatement("SELECT * FROM t2 WHERE c21=? AND c22=?");
      ps.setInt(1, 0);
        ps.setString(2, "Tuple 4");
        JDBC.assertDrainResults(ps.executeQuery());
    RuntimeStatisticsParser rtsp = SQLUtilities.getRuntimeStatisticsParser(s);
    assertTrue(rtsp.usedSpecificIndexForIndexScan("T2","T2I1"));


    //Running the update statistics below will create statistics for T2I2
    s.execute("CALL SYSCS_UTIL.SYSCS_UPDATE_STATISTICS('APP','T2','T2I2')");
        stats.assertIndexStats("T2I2", 1);

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        //Rerunning the query "SELECT * FROM t2 WHERE c21=? AND c22=?" and
        //looking at it's plan will show that this time it picked up more
        //efficient index which is T2I2. 
        JDBC.assertDrainResults(ps.executeQuery());
    rtsp = SQLUtilities.getRuntimeStatisticsParser(s);
    assertTrue(rtsp.usedSpecificIndexForIndexScan("T2","T2I2"));
        //cleanup
        s.executeUpdate("DROP TABLE t2");
        //End of test case for better index selection after statistics
        //availability
        stats.release();

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