Bug 124629 Use Top/Bottom n in a field containing null value inside will cause DataException.
Description: Use Top/Bottom n in a field containing null value inside will cause DataException. Steps to reproduce: 1. New a data source and dataset 2. Add a filter on a field, set operator to top 5 3. Click Preview Result. Result: A BIRT exception occurred. Plug-in Provider:Eclipse.org Plug-in Name:BIRT Data Engine Plug-in ID:org.eclipse.birt.data Version:2.0.0 Error Code:data.engine.DataConversionError Error Message:An error happened in data type conversion. Can not convert the value of {NULL_VALUE_!@#$%^&} to Double type.
data/org.eclipse.birt.data/src/org/eclipse/birt/data/engine/i18n/ResourceConstants.java
public final static String EXPR_INVALID_COMPUTED_COLUMN= "data.engine.BadCompColExpr";
	
	public final static String WRONG_DATA_TYPE_COMPUTED_COLUMN= "data.engine.CompCol.WrongDataType";
	public final static String WRONG_DATA_TYPE_SCRIPT_RESULT= "data.engine.ScriptResult.WrongDataType";
	
	
	public final static String INVALID_EXPRESSION_IN_FILTER = "data.engine.BadFilterExpr";
	
	
	public final static String CLOB_OPEN_ERROR = "data.engine.opencloberror";
	public final static String CLOB_READ_ERROR = "data.engine.readcloberror";
	public final static String BLOB_OPEN_ERROR = "data.engine.openbloberror";
	public final static String BLOB_READ_ERROR = "data.engine.readbloberror";
	
	
	public final static String DESTINDEX_OUTOF_RANGE = "data.engine.BadDestIndex";
	public final static String WRITE_TEMPFILE_ERROR = "data.engine.WriteTempError";
	public final static String READ_TEMPFILE_ERROR = "data.engine.ReadTempError";
	
	
	public final static String DATATYPEUTIL_ERROR = "data.engine.DataConversionError";
	public final static String INVALID_TYPE_IN_EXPR = "data.engine.BadDataTypeCondExpr";
	public final static String WRAPPED_BIRT_EXCEPTION = "data.engine.BirtException";
	
	
	public final static String RD_INVALID_MODE = "data.engine.InvalidMode";
	public final static String RD_INVALID_ARCHIVE = "data.engine.InvalidArchive";
	public final static String RD_SAVE_ERROR = "data.engine.SaveReportDocumentError";
	public final static String RD_LOAD_ERROR = "data.engine.LoadReportDocumentError";