Column comparison does not check on native types
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Key: DDLUTILS-54
URL: http://issues.apache.org/jira/browse/DDLUTILS-54
Project: DdlUtils
Type: Bug
Reporter: Konstantinos Stathatos
Assigned to: Thomas Dudziak
Priority: Minor
Attachments: zementis_tests.ant
The attached Ant script creates a table (in Derby) and then tries to alter it,
using the same database description. I would expect the DdlUtils would not try
to modify anything as the database has not changed.
However, the database defines a BOOLEAN column and a FLOAT column which in a
Derby are mapped to a SMALLINT column and a DOUBLE column. With such a mapping,
next time the columns are compared DdlUtils finds them different since the type
codes are different. As a result, it tries to modify the columns even though
the modification is not necessary.
Generally, such modification is really harmless. However, under my particular
use case, occasionally a DBA would have to get involved and manually update the
database if modifications are needed (i.e. if a non-empty alter sql is
generated). This means that taking the extra step to check based on the native
types if the modifications are material or not would be important.
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