Bug 213959 [Regression]Blob computed column doesn't work
Description: [Regression]Blob type computed column doesn't work Build number: 2.3.0.v20071228-1005 Steps to reproduce: 1, New a sampleDB from table PRODUCTLINE 2, New a computed column A; type is Blob; expression is row["IMAGE"] 3, Preview in dataset Expected result: The dataset can be preview ok Actual result: Error happened Error log: A BIRT exception occurred. Plug-in Provider:Eclipse.org Plug-in Name:BIRT Data Engine Plug-in ID:org.eclipse.birt.data Version:2.3.0.v20071228-1005 Error Code:data.engine.CompCol.FailRetrieveValueComputedColumn Error Message:Fail to compute value for computed column "AAA". Can not convert the value of [B@1a9efcd to Blob type.
core/org.eclipse.birt.core/src/org/eclipse/birt/core/data/DataTypeUtil.java
* Boolean -> String
	 * 		Boolean.toString()
	 * Date	-> String
	 * 		toString(Date,locale)
	 * @param source
	 * @return
	 * @throws BirtException
	 */
	public static String toString( Object source, ULocale locale )
			throws BirtException
	{
		if ( source == null )
			return null;
		if ( source instanceof Time )
		{
			return ((Time) source).toString( );
		}
		else if ( source instanceof java.sql.Date )
		{
			return ((java.sql.Date) source).toString( );
		}
		else if ( source instanceof Timestamp )
		{
			return ((java.sql.Timestamp) source).toString( );
		}
		else if ( source instanceof Date )
		{
			return toString( (Date) source, locale );
		}
		else if ( source instanceof Number )