Enable the adding of generated columns via ALTER TABLE
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                 Key: DERBY-3922
                 URL: https://issues.apache.org/jira/browse/DERBY-3922
             Project: Derby
          Issue Type: Task
          Components: SQL
    Affects Versions: 10.5.0.0
            Reporter: Rick Hillegas


The initial grammar patch for generated columns did not include ALTER TABLE 
support. This support cannot be added until we check in the UPDATE logic for 
generated columns. Adding a generated column to an existing table is supposed 
to calculate the generated column's values for all rows currently in the table.

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