[jira] [Created] (TAJO-1239) ORDER BY with null column desc miss some data.

["Hyoungjun Kim (JIRA)" <ji...@apache.org>]

Hyoungjun Kim created TAJO-1239:
-----------------------------------

             Summary: ORDER BY with null column desc miss some data.
                 Key: TAJO-1239
                 URL: https://issues.apache.org/jira/browse/TAJO-1239
             Project: Tajo
          Issue Type: Bug
            Reporter: Hyoungjun Kim
            Priority: Minor


TAJO-904 fixed the ORDER BY ascending bug. But descending with null column still miss some data. I tested the following code.

{code}
KeyValueSet tableOptions = new KeyValueSet();
tableOptions.set(StorageConstants.TEXT_DELIMITER, StorageConstants.DEFAULT_FIELD_DELIMITER);
tableOptions.set(StorageConstants.TEXT_NULL, "\\\\N");

Schema schema = new Schema();
schema.addColumn("id", Type.INT4);
schema.addColumn("name", Type.TEXT);
String[] data = new String[]{ "1|111", "2|\\N", "3|333" };
TajoTestingCluster.createTable("table11", schema, tableOptions, data, 1);

try {
  ResultSet res = executeString("select * from table11 order by name asc");
  String ascExpected = "id,name\n" +
      "-------------------------------\n" +
      "1,111\n" +
      "3,333\n" +
      "2,null\n";

  assertEquals(ascExpected, resultSetToString(res));
  res.close();

  res = executeString("select * from table11 order by name desc");
  String descExpected = "id,name\n" +
      "-------------------------------\n" +
      "2,null\n" +
      "3,333\n" +
      "1,111\n";

  assertEquals(descExpected, resultSetToString(res));
  res.close();
} finally {
  executeString("DROP TABLE table11 PURGE");
} 
{code}

The first query is successful, but the second query will fail.



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