[hibernate-issues] [Hibernate-JIRA] Created: (HHH-3338) Order of attributes in generated SQL query is dependent on Java version

[Michael Gerz (JIRA)]

Order of attributes in generated SQL query is dependent on Java version
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                 Key: HHH-3338
                 URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-3338
             Project: Hibernate3
          Issue Type: Bug
          Components: core
    Affects Versions: 3.2.6
         Environment: WIndows XP, Java 5 Update 15, Java 6 update 5
            Reporter: Michael Gerz


We use Hibernate Core 3.2.6 in combination with Derby 10.4.1.3. 

When migrating from Java 5 to Java 6, we noticed a huge performance hit. Our analysis has unveiled that Hibernate 3.2.6 produces semantical identical but syntactically different queries for Java 5 and Java 6.

Java 5:

Hibernate: select logevent0_.ID as ID7_, logevent0_.INDEX_SENT as INDEX2_7_, logevent0_.TEST_RUN_ID as TEST3_7_, logevent0_.SENDER as SENDER7_, logevent0_.TIME_SENT as TIME5_7_, logevent0_.MESSAGE as MESSAGE8_, logevent0_.SEVERITY as SEVERITY8_, logevent0_.SERIALIZED_CONTENT as SERIALIZED1_11_, logevent0_.RECEIVER as RECEIVER11_, logevent0_.TIME_RECEIVED as TIME3_11_, logevent0_.INDEX_RECEIVED as INDEX4_11_, logevent0_.ACTION_REQUEST as ACTION1_13_, logevent0_.ACTION_REPLY as ACTION1_14_, logevent0_.clazz_ as clazz_ from ( select TEST_RUN_ID, SENDER, MESSAGE, SEVERITY, nullif('x','x') as SERIALIZED_CONTENT, nullif('2000-1-1 00:00:00','2000-1-1 00:00:00') as TIME_RECEIVED, ID, nullif('x','x') as ACTION_REQUEST, TIME_SENT, nullif('x','x') as ACTION_REPLY, nullif('x','x') as RECEIVER, nullif(0,0) as INDEX_RECEIVED, INDEX_SENT, 2 as clazz_ from USER_LOG_EVENT union all select TEST_RUN_ID, SENDER, MESSAGE, SEVERITY, nullif('x','x') as SERIALIZED_CONTENT, nullif('2000-1-1 00:00:00','2000-1-1 00:00:00') as TIME_RECEIVED, ID, nullif('x','x') as ACTION_REQUEST, TIME_SENT, nullif('x','x') as ACTION_REPLY, nullif('x','x') as RECEIVER, nullif(0,0) as INDEX_RECEIVED, INDEX_SENT, 3 as clazz_ from DEVEL_LOG_EVENT union all select TEST_RUN_ID, SENDER, nullif('x','x') as MESSAGE, nullif('x','x') as SEVERITY, nullif('x','x') as SERIALIZED_CONTENT, nullif('2000-1-1 00:00:00','2000-1-1 00:00:00') as TIME_RECEIVED, ID, ACTION_REQUEST, TIME_SENT, nullif('x','x') as ACTION_REPLY, nullif('x','x') as RECEIVER, nullif(0,0) as INDEX_RECEIVED, INDEX_SENT, 6 as clazz_ from ACTION_REQUEST_LOG_EVENT union all select TEST_RUN_ID, SENDER, nullif('x','x') as MESSAGE, nullif('x','x') as SEVERITY, nullif('x','x') as SERIALIZED_CONTENT, nullif('2000-1-1 00:00:00','2000-1-1 00:00:00') as TIME_RECEIVED, ID, nullif('x','x') as ACTION_REQUEST, TIME_SENT, ACTION_REPLY, nullif('x','x') as RECEIVER, nullif(0,0) as INDEX_RECEIVED, INDEX_SENT, 7 as clazz_ from ACTION_REPLY_LOG_EVENT union all select TEST_RUN_ID, SENDER, nullif('x','x') as MESSAGE, nullif('x','x') as SEVERITY, SERIALIZED_CONTENT, TIME_RECEIVED, ID, nullif('x','x') as ACTION_REQUEST, TIME_SENT, nullif('x','x') as ACTION_REPLY, RECEIVER, INDEX_RECEIVED, INDEX_SENT, 4 as clazz_ from DATA_FLOW_LOG_EVENT ) logevent0_ where logevent0_.TEST_RUN_ID=?

Java 6:

Hibernate: select logevent0_.ID as ID7_, logevent0_.INDEX_SENT as INDEX2_7_, logevent0_.TEST_RUN_ID as TEST3_7_, logevent0_.SENDER as SENDER7_, logevent0_.TIME_SENT as TIME5_7_, logevent0_.MESSAGE as MESSAGE8_, logevent0_.SEVERITY as SEVERITY8_, logevent0_.SERIALIZED_CONTENT as SERIALIZED1_11_, logevent0_.RECEIVER as RECEIVER11_, logevent0_.TIME_RECEIVED as TIME3_11_, logevent0_.INDEX_RECEIVED as INDEX4_11_, logevent0_.ACTION_REQUEST as ACTION1_13_, logevent0_.ACTION_REPLY as ACTION1_14_, logevent0_.clazz_ as clazz_ from ( select nullif('x','x') as RECEIVER, TIME_SENT, SEVERITY, nullif('2000-1-1 00:00:00','2000-1-1 00:00:00') as TIME_RECEIVED, ID, SENDER, MESSAGE, TEST_RUN_ID, nullif('x','x') as SERIALIZED_CONTENT, INDEX_SENT, nullif(0,0) as INDEX_RECEIVED, nullif('x','x') as ACTION_REQUEST, nullif('x','x') as ACTION_REPLY, 2 as clazz_ from USER_LOG_EVENT union all select nullif('x','x') as RECEIVER, TIME_SENT, SEVERITY, nullif('2000-1-1 00:00:00','2000-1-1 00:00:00') as TIME_RECEIVED, ID, SENDER, MESSAGE, TEST_RUN_ID, nullif('x','x') as SERIALIZED_CONTENT, INDEX_SENT, nullif(0,0) as INDEX_RECEIVED, nullif('x','x') as ACTION_REQUEST, nullif('x','x') as ACTION_REPLY, 3 as clazz_ from DEVEL_LOG_EVENT union all select nullif('x','x') as RECEIVER, TIME_SENT, nullif('x','x') as SEVERITY, nullif('2000-1-1 00:00:00','2000-1-1 00:00:00') as TIME_RECEIVED, ID, SENDER, nullif('x','x') as MESSAGE, TEST_RUN_ID, nullif('x','x') as SERIALIZED_CONTENT, INDEX_SENT, nullif(0,0) as INDEX_RECEIVED, ACTION_REQUEST, nullif('x','x') as ACTION_REPLY, 6 as clazz_ from ACTION_REQUEST_LOG_EVENT union all select nullif('x','x') as RECEIVER, TIME_SENT, nullif('x','x') as SEVERITY, nullif('2000-1-1 00:00:00','2000-1-1 00:00:00') as TIME_RECEIVED, ID, SENDER, nullif('x','x') as MESSAGE, TEST_RUN_ID, nullif('x','x') as SERIALIZED_CONTENT, INDEX_SENT, nullif(0,0) as INDEX_RECEIVED, nullif('x','x') as ACTION_REQUEST, ACTION_REPLY, 7 as clazz_ from ACTION_REPLY_LOG_EVENT union all select RECEIVER, TIME_SENT, nullif('x','x') as SEVERITY, TIME_RECEIVED, ID, SENDER, nullif('x','x') as MESSAGE, TEST_RUN_ID, SERIALIZED_CONTENT, INDEX_SENT, INDEX_RECEIVED, nullif('x','x') as ACTION_REQUEST, nullif('x','x') as ACTION_REPLY, 4 as clazz_ from DATA_FLOW_LOG_EVENT ) logevent0_ where logevent0_.TEST_RUN_ID=?

The first order (using Java 5) looks more reasonable, because TEST_RUN_ID is the first column in all of the tables and it is also a foreign key.

The changed order of attributes does not really explain why Derby performs so poor on Java 6 and we have already issued a report to the Derby community. 

Nevertheless, the SQL queries generated Hibernate should not depend on a specific version of Java. Maybe a compareTo() method is missing somewhere in the code...?



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