Derby adapter is not able to remove NOT NULL relationship
---------------------------------------------------------

                 Key: CAY-1063
                 URL: https://issues.apache.org/cayenne/browse/CAY-1063
             Project: Cayenne
          Issue Type: Bug
          Components: Cayenne Core Library
    Affects Versions: 3.0
         Environment: Does Derby even support this operation?
            Reporter: Øyvind Harboe
            Assignee: Andrus Adamchik
            Priority: Minor


31000 [SocketListener0-9] INFO  org.apache.cayenne.access.QueryLogger  - 
Detected and installed adapter: org.apache.cayenne.dba.derby.DerbyAdapter
45641 [SocketListener0-9] INFO  org.apache.cayenne.access.QueryLogger  - ALTER 
TABLE log_email ALTER COLUMN sender DROP NOT NULL
45704 [SocketListener0-9] INFO  org.apache.cayenne.access.QueryLogger  - *** 
error.
java.sql.SQLException: Syntax error: Encountered "DROP" at line 1, column 43.
        at 
org.apache.derby.impl.jdbc.SQLExceptionFactory.getSQLException(Unknown Source)
        at org.apache.derby.impl.jdbc.Util.generateCsSQLException(Unknown 
Source)
        at 
org.apache.derby.impl.jdbc.TransactionResourceImpl.wrapInSQLException(Unknown 
Source)
        at 
org.apache.derby.impl.jdbc.TransactionResourceImpl.handleException(Unknown 
Source)
        at org.apache.derby.impl.jdbc.EmbedConnection.handleException(Unknown 
Source)
        at org.apache.derby.impl.jdbc.ConnectionChild.handleException(Unknown 
Source)
        at org.apache.derby.impl.jdbc.EmbedStatement.execute(Unknown Source)
        at org.apache.derby.impl.jdbc.EmbedStatement.execute(Unknown Source)
        at 
org.apache.cayenne.merge.ExecutingMergerContext.executeSql(ExecutingMergerContext.java:60)
        at 
org.apache.cayenne.merge.AbstractToDbToken.execute(AbstractToDbToken.java:41)


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