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
* @param source
	 * @param locale
	 * @return
	 */
	private static String toString( Number source, ULocale locale )
	{
		NumberFormat nf = (NumberFormat)nfMap.get( locale );
		if( nf == null )
		{
			synchronized( nfMap )
			{
				nf = (NumberFormat)nfMap.get( locale );
				if( nf == null )
				{
					nf = NumberFormat.getInstance( locale );
					nfMap.put( locale, nf );
				}
			}
		}
		return nf.format( source );
	}
	
	/**
	 * Converting Blob to/from other types is not currently supported
	 * @param source
	 * @return
	 * @throws BirtException
	 */
	public static Blob toBlob( Object source ) throws BirtException
	{