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https://issues.apache.org/jira/browse/DERBY-5235?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13034831#comment-13034831
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Knut Anders Hatlen commented on DERBY-5235:
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> - I think there may be more complications regarding implementing this for
> client/server than embedded.
It looks like the client has problems with the current limits too. For example,
the following JUnit test case passes with the embedded driver, but returns a
truncated value and fails with the client driver:
public void testLongColumn() throws SQLException {
PreparedStatement ps = prepareStatement(
"values cast(? as varchar(20000))");
char[] chars = new char[20000];
Arrays.fill(chars, '\u4e10');
String str = new String(chars);
ps.setString(1, str);
JDBC.assertSingleValueResultSet(ps.executeQuery(), str);
}
The VARCHAR value seems to be truncated down to 32700 bytes (note: bytes, not
characters!) and the wrong value is returned. I'll file a separate bug report
for this issue.
> Remove the artificial limit on the length of VARCHAR values, allowing them to
> be java.lang.Integer.MAX_VALUE long
> -----------------------------------------------------------------------------------------------------------------
>
> Key: DERBY-5235
> URL: https://issues.apache.org/jira/browse/DERBY-5235
> Project: Derby
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 10.9.0.0
> Reporter: Rick Hillegas
>
> The original Cloudscape limit for the length of VARCHAR values was
> java.lang.Integer.MAX_VALUE. That is the limit in Cloudscape 5.1. Nothing in
> Derby should break if we restore the original limit. The current limit is an
> artificial bound introduced to make Derby agree with DB2. 32672 is the upper
> bound on the length of a DB2 VARCHAR:
> http://publib.boulder.ibm.com/infocenter/db2luw/v8/index.jsp?topic=/com.ibm.db2.udb.doc/admin/r0001029.htm
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