Bug 180842 Config memory buffer size in data engine execution.
To tuning the performance, it is necessary for DtE to expose API for clients to config the size of memory it used to store the final result set. A new AppContext string, "org.eclipse.birt.data.cache.memory.size" is proposed. The new appcontext entry only accept positive integer as input, the unit of which would be MB.
data/org.eclipse.birt.data/src/org/eclipse/birt/data/engine/i18n/ResourceConstants.java
public final static String COLUMN_BINDING_CYCLE = "data.engine.ColumnBindingCycle";
	public final static String COLUMN_BINDING_REFER_TO_INEXIST_COLUMN = "data.engine.ColumnBindingReferToInexistColumn";
	public final static String COLUMN_BINDING_REFER_TO_AGGREGATION_COLUMN_BINDING_IN_PARENT_QUERY = "data.engine.ColumnBindingReferToAggregationColumnBindingInParentQuery";
	
	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 INVALID_DEFINITION_IN_FILTER = "data.engine.BadFilterDefn";
	public final static String BAD_GROUP_EXPRESSION = "data.engine.BadGroupExpr";
	
	
	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 LOAD_FACTORY_ERROR = "load.factory.error";
	
	
	public final static String DATATYPEUTIL_ERROR = "data.engine.DataConversionError";