[jira] [Created] (TRAFODION-3314) OSIM generates redundant DDL for unique constraints

["David Wayne Birdsall (JIRA)" <ji...@apache.org>]

David Wayne Birdsall created TRAFODION-3314:
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             Summary: OSIM generates redundant DDL for unique constraints
                 Key: TRAFODION-3314
                 URL: https://issues.apache.org/jira/browse/TRAFODION-3314
             Project: Apache Trafodion
          Issue Type: Improvement
          Components: sql-cmp
    Affects Versions: 2.4
            Reporter: David Wayne Birdsall
            Assignee: David Wayne Birdsall


Unique constraints are usually implemented by creation of a unique index under the covers. When doing an OSIM CAPTURE of a query on a table that has a unique constraint, OSIM generates both an ALTER TABLE ADD CONSTRAINT statement and a CREATE UNIQUE INDEX statement in the CREATE_TABLE_DDLS.txt file. When this is replayed in OSIM LOAD, we get an error when creating the unique index. 

To fix this, perhaps OSIM should generate the CREATE UNIQUE INDEX statement only in commented-out form.

{{To reproduce, run the following script in sqlci:}}

{{?section setup}}

{{drop table if exists t1 cascade;}}

{{create table t1 (a int not null, b int not null, c int not null, primary key (a));}}

{{alter table t1 add constraint uniqueb unique(b);}}

{{?section osimgen}}

{{control osim capture location 'osimgen';}}

{{prepare xx from select b,count(*) from t1 group by b;}}

{{control osim capture stop;}}

{{Then in a separate session, do:}}

{{control osim load from 'osimgen';}}

{{This will fail with the following output:}}

{{>>control osim load from '.';}}
{{[OSIM]loading tables and views ...}}
{{[OSIM]DROP TABLE IF EXISTS TRAFODION.SCH.T1 CASCADE;}}
{{[OSIM]Step 1 Create Schemas:}}
{{[OSIM]CREATE SCHEMA IF NOT EXISTS TRAFODION.SCH}}
{{[OSIM]Step 2 Create Tables:}}
{{[OSIM]CREATE TABLE TRAFODION.SCH.T1}}
{{[OSIM] The following index is a system created index --CREATE UNIQUE INDEX UNIQUEB ON TRAFODION.SCH.T1}}
{{[OSIM]ALTER TABLE TRAFODION.SCH.T1 ADD CONSTRAINT TRAFODION.SCH.UNIQUEB UNIQUE}}

{{*** ERROR[1043] Constraint TRAFODION.SCH.UNIQUEB already exists.}}

{{*** ERROR[6009] The Optimizer Simulator (OSIM): Create Table Error: -1043}}

{{*** ERROR[8822] The statement was not prepared.}}

{{>>exit;}}

 



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