Setting a default value for a VARCHAR column fails when column contains data
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Key: DERBY-2371
URL: https://issues.apache.org/jira/browse/DERBY-2371
Project: Derby
Issue Type: Bug
Components: SQL
Affects Versions: 10.2.2.0, 10.2.1.6
Environment: This probably affects all platforms.
Reporter: Tim Dudgeon
I'm seeing a problem updating the default value for a VARCHAR column when the
column already contains data. I'm, using:
alter table TABLE_NAME alter column COL_NAME DEFAULT 'new value'
and with some VARCHAR columns I get an error like this:
Invalid character string format for type long.; nested exception is
java.sql.SQLException: Invalid character string format for type long.
Caused by: ERROR 22018: Invalid character string format for type long.
at org.apache.derby.iapi.error.StandardException.newException(Unknown
Source)
at org.apache.derby.iapi.types.SQLChar.getLong(Unknown Source)
at
org.apache.derby.impl.sql.execute.AlterTableConstantAction.getColumnMax(Unknown
Source)
at
org.apache.derby.impl.sql.execute.AlterTableConstantAction.modifyColumnDefault(Unknown
Source)
at
org.apache.derby.impl.sql.execute.AlterTableConstantAction.execGuts(Unknown
Source)
at
org.apache.derby.impl.sql.execute.AlterTableConstantAction.executeConstantAction(Unknown
Source)
at org.apache.derby.impl.sql.execute.MiscResultSet.open(Unknown Source)
at org.apache.derby.impl.sql.GenericPreparedStatement.execute(Unknown
Source)
at org.apache.derby.impl.jdbc.EmbedStatement.executeStatement(Unknown
Source)
at org.apache.derby.impl.jdbc.EmbedStatement.execute(Unknown Source)
at org.apache.derby.impl.jdbc.EmbedStatement.execute(Unknown Source)
This only happens on VARCHAR columns containing data. Columns that are entirely
NULL update fine.
This was discussed on users mailing list:
http://www.nabble.com/problem-with-ALTER-COLUMN-DEFAULT-on-VARCHAR-column-tf3274046.html
and the conclusion was that it is related to this statement being run
internally as part of the updata process:
SELECT MAX(COL_NAME) FROM TABLE_NAME
As reported in that discussion:
-bash-2.05b$ java org.apache.derby.tools.ij
ij version 10.3
ij> connect 'jdbc:derby:brydb';
ij> create table t (a varchar(10));
0 rows inserted/updated/deleted
ij> alter table t alter column a default 'my val';
0 rows inserted/updated/deleted
ij> insert into t (a) values ('hi');
1 row inserted/updated/deleted
ij> alter table t alter column a default 'another val';
ERROR 22018: Invalid character string format for type long.
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