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 RD_SAVE_STREAM_ERROR = "data.engine.GetSaveStreamError";
	public final static String RD_LOAD_STREAM_ERROR = "data.engine.GetLoadStreamError";
	public final static String RD_EXPR_NULL_ERROR = "data.engine.NullExpr";
	public final static String RD_EXPR_INVALID_ERROR = "data.engine.InValidExpr";
	
	
	public final static String SCRIPT_EVAL_ERROR = "data.engine.ScriptEvalError";
	public final static String PREPARED_QUERY_CLOSED = "data.engine.PreparedQueryClosed";	
	public final static String DEFAULT_INPUT_PARAMETER_VALUE_CANNOT_BE_NULL = "data.engine.NullDefaultInParamValue";
	public final static String INVALID_GROUP_EXPR = "data.engine.BadGroupKeyExpr";
	public final static String INVALID_SORT_EXPR = "data.engine.BadSortKeyExpr";
	public final static String PARAMETER_METADATA_NOT_SUPPORTED = "data.engine.NoParamMetaForDataSource";
	public final static String UNEXPECTED_ERROR = "data.engine.UnexpectedError";
	public final static String CANNOT_CONVERT_PARAMETER_TYPE = "data.engine.ConvertDataTypeError";
	public static final String CANNOT_INSTANTIATE_AGGREGATION_FACTORY = "data.engine.CannotInstantiateAggregationFactory";
	public static final String DUPLICATE_AGGREGATION_NAME = "date.engine.DuplicateAggregationName";
	public static final String INCORRECT_GROUP_KEY_VALUES = "data.engine.incorrectGroupKeyValues";
	public static final String NO_EXPRESSION_PROCESSOR_AVAILABLE = "data.engine.NoExpressionProcessorAvailable";
	public static final String INCONVERTIBLE_DATATYPE="data.engine.InconvertibleDatatype";
	public static final String CONVERT_TO_DATATYPE_ERROR="data.engine.ConvertToDataTypeError";
	public static final String NO_ROW_UPDATE="data.engine.NoRowUpdate";
	public static final String BAD_DATA_TYPE= "data.engine.BadDataType";
	
	
	public final static String COLUMN_NAME_CANNOT_BE_EMPTY_OR_NULL = "odaconsumer.ColumnNameCannotBeEmptyOrNull";
	public final static String COLUMN_POSITION_CANNOT_BE_LESS_THAN_ONE = "odaconsumer.ColumnPositionIsOneBased";
	public final static String COLUMN_ALIAS_CANNOT_BE_EMPTY = "odaconsumer.ColumnAliasCannotBeEmpty";
	public final static String CANNOT_PROCESS_DRIVER_CONFIG = "odaconsumer.CannotProcessDriverConfig";
	public final static String INIT_ENTRY_CANNOT_BE_FOUND = "odaconsumer.OdaInitEntryNotFound";
	public final static String ODA_DRIVER_ON_UNSUPPORTED_PLATFORM = "odaconsumer.OdaDriverOnUnsupportedPlatform";