Informix will throw an exception when a unique index is explictily created on 
the primary key columns
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                 Key: OPENJPA-605
                 URL: https://issues.apache.org/jira/browse/OPENJPA-605
             Project: OpenJPA
          Issue Type: Bug
            Reporter: Fay Wang


When an entity is defined as following (unique index annotation on the primary 
key field. In this situation): 

@Entity
@Table(name="AddressBean")   
public class AddressBeanAno implements IAddressBean,  Serializable {
    @EmbeddedId
    @Index(name="street_index",unique=true)
    @Column(length=30)
    private AddressPK street;

Informix will issue an error:

Caused by: org.apache.openjpa.lib.jdbc.ReportingSQLException: Index already 
exists on column. {stmnt 1440372186 CREATE UNIQUE INDEX street_index ON 
AddressBean (street)} [code=-350, state=S0011]
        at 
org.apache.openjpa.lib.jdbc.LoggingConnectionDecorator.wrap(LoggingConnectionDecorator.java:192)
        at 
org.apache.openjpa.lib.jdbc.LoggingConnectionDecorator.access$3(LoggingConnectionDecorator.java:189)
        at 
org.apache.openjpa.lib.jdbc.LoggingConnectionDecorator$LoggingConnection$LoggingStatement.executeUpdate(LoggingConnectionDecorator.java:762)
        at 
org.apache.openjpa.lib.jdbc.DelegatingStatement.executeUpdate(DelegatingStatement.java:114)
        at 
org.apache.openjpa.jdbc.schema.SchemaTool.executeSQL(SchemaTool.java:1204)
        at 
org.apache.openjpa.jdbc.schema.SchemaTool.createIndex(SchemaTool.java:1019)
        at org.apache.openjpa.jdbc.schema.SchemaTool.add(SchemaTool.java:554)
        at org.apache.openjpa.jdbc.schema.SchemaTool.add(SchemaTool.java:344)
        at org.apache.openjpa.jdbc.schema.SchemaTool.run(SchemaTool.java:321)
        at org.apache.openjpa.jdbc.meta.MappingTool.record(MappingTool.java:501)

Per Informaix SQL syntax guide (Create Index section):
You can not add a unique index to a column or column list that a primary -key 
constraint on it. The reason is  that defining the column or column list as the 
primary key causes the database server to create a unique internal index on the 
column or column list. So you cannot create another unique index on this column 
or column list with CREATE INDEX statement.    




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