Bug 211839 String grouping unit type needs to support interval range.
Build ID: I20071101-2000 As Chart has supported, the String grouping unit type can be set interval range, the interval range means that the string group will base on row count distinction. For instance, let's say we have a,b,c,d,e,f,g , and set interval range to 2, the grouping result should be a,c,e,g. Now it is a requirement that DtE support the grouping type.
data/org.eclipse.birt.data/src/org/eclipse/birt/data/engine/i18n/ResourceConstants.java
public final static String FAIL_COMPUTE_COMPUTED_MEASURE_VALUE = "data.olap.failComputeComputedMeasureValue";
	public final static String DUPLICATE_MEASURE_NAME = "data.olap.duplicateMeasureName";
	
	public final static String CONFIG_FILE_PARSER_MODE_FAIL = "data.executor.configFileParser.getModeByID";
	public final static String CONFIG_FILE_PARSER_TIMESTAMP_FORMAT_FAIL = "data.executor.configFileParser.getTSFormatByID";
	public final static String CONFIG_FILE_PARSER_TIMESTAMP_COLUMN_FAIL = "data.executor.configFileParser.getTimeStampColumnByID";
	public final static String CONFIG_FILE_PARSER_QUERYTEXT_FAIL = "data.executor.configFileParser.getQueryTextByID";
	public final static String CONFIG_FILE_PARSER_PARAMETERS_FORMAT_FAIL = "data.executor.configFileParser.getParametersByID";
	
	
	public final static String TOTAL_FUNC_SUM = "total.func.sum";
	public final static String TOTAL_FUNC_RUNNINGSUM = "total.func.runningSum";
	public final static String TOTAL_FUNC_COUNT = "total.func.count";
	public final static String TOTAL_FUNC_RUNNINGCOUNT = "total.func.runningCount";
	public final static String TOTAL_FUNC_COUNTDISTINCT = "total.func.countDistinct";
	public final static String TOTAL_FUNC_MAX = "total.func.max";
	public final static String TOTAL_FUNC_MIN = "total.func.min";
	public final static String TOTAL_FUNC_AVE = "total.func.ave";
	public final static String TOTAL_FUNC_WEIGHTEDAVE = "total.func.weightedAve";
	public final static String TOTAL_FUNC_MOVINGAVE = "total.func.movingAve";
	public final static String TOTAL_FUNC_MEDIAN = "total.func.median";
	public final static String TOTAL_FUNC_MODE = "total.func.mode";
	public final static String TOTAL_FUNC_STDDEV = "total.func.stdDev";
	public final static String TOTAL_FUNC_VARIANCE = "total.func.variance";
	public final static String TOTAL_FUNC_FIRST = "total.func.first";
	public final static String TOTAL_FUNC_LAST = "total.func.last";
	public final static String TOTAL_FUNC_RANK = "total.func.rank";
	public final static String TOTAL_FUNC_PERCENTRANK = "total.func.percentRank";
	public final static String TOTAL_FUNC_PERCENTILE = "total.func.percentile";
	public final static String TOTAL_FUNC_QUARTILE = "total.func.quartile";