Provide ALTER TABLE DROP COLUMN functionality
---------------------------------------------

         Key: DERBY-1489
         URL: http://issues.apache.org/jira/browse/DERBY-1489
     Project: Derby
        Type: New Feature

  Components: Documentation, SQL  
    Versions: 10.0.2.0, 10.0.2.1, 10.1.1.0, 10.2.0.0, 10.1.2.1, 10.1.3.0, 
10.1.3.1    
    Reporter: Bryan Pendleton
 Assigned to: Bryan Pendleton 
     Fix For: 10.2.0.0


Provide a way to drop a column from an existing table. Possible syntax would be:

  ALTER TABLE tablename DROP COLUMN columnname CASCADE / RESTRICT;

Feature should properly handle columns which are used in constraints, views, 
triggers, indexes, etc.


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