Using functions, you can create a LONG VARCHAR value which is longer than the
maximum length of a Derby LONG VARCHAR
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Key: DERBY-3512
URL: https://issues.apache.org/jira/browse/DERBY-3512
Project: Derby
Issue Type: Bug
Components: SQL
Affects Versions: 10.4.0.0
Reporter: Rick Hillegas
Attachments: BigStringMaker.java, bigStrings.sql
I can create a static method which returns a long String and register this as a
function which returns LONG VARCHAR. I am able to invoke this function and
create a LONG VARCHAR value which is longer than the maximum length which Derby
allows for this datatype (32700 characters).
It is not clear to me what is supposed to happen in this situation according to
the SQL standard. However, the current behavior seems wrong. Here are two
possible correct behaviors:
1) Raise an exception if the user-coded method violates the declared contract
of the CREATE FUNCTION statement.
2) Silently truncate the value returned by the user-coded method.
There may be a similar problem with methods which return byte[] and which are
registered as functions returning (LONG) VARCHAR FOR BIT DATA. However,
experiments to test this are blocked by DERBY-3511.
I will attach a test case demonstrating the problem.
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