org.apache.iotdb.db.qp.utils

类 GroupByLevelController

java.lang.Object

org.apache.iotdb.db.qp.utils.GroupByLevelController

public class GroupByLevelController
extends Object

This class is used to control the row number of group by level query. For example, selected series[root.sg.d1.s1, root.sg.d2.s1, root.sg2.d1.s1], level = 1; the result rows will be [root.sg.*.s1, root.sg2.*.s1], sLimit and sOffset will be used to control the result numbers rather than the selected series.

字段概要

字段

限定符和类型	字段和说明
static String	ALIAS_ERROR_MESSAGE1
static String	ALIAS_ERROR_MESSAGE2

构造器概要

构造器

构造器和说明
GroupByLevelController(QueryOperator operator)

方法概要

限定符和类型	方法和说明
void	control(ResultColumn rawColumn, List<ResultColumn> resultColumns)
String	generatePartialPathByLevel(boolean isCountStar, String[] nodes, int[] pathLevels) Transform an originalPath to a partial path that satisfies given level.
String	getAlias(String originName)
String	getGroupedPath(String rawPath)

从类继承的方法 java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

字段详细资料

ALIAS_ERROR_MESSAGE1

public static String ALIAS_ERROR_MESSAGE1

ALIAS_ERROR_MESSAGE2

public static String ALIAS_ERROR_MESSAGE2

构造器详细资料

GroupByLevelController

public GroupByLevelController(QueryOperator operator)

方法详细资料

getGroupedPath

public String getGroupedPath(String rawPath)

getAlias

public String getAlias(String originName)

control

public void control(ResultColumn rawColumn,
                    List<ResultColumn> resultColumns)
             throws LogicalOptimizeException

抛出:

LogicalOptimizeException

generatePartialPathByLevel

public String generatePartialPathByLevel(boolean isCountStar,
                                         String[] nodes,
                                         int[] pathLevels)

Transform an originalPath to a partial path that satisfies given level. Path nodes don't satisfy the given level will be replaced by "*" except the sensor level, e.g. generatePartialPathByLevel("root.sg.dh.d1.s1", 2) will return "root.*.dh.*.s1".

Especially, if count(*), then the sensor level will be replaced by "*" too.

返回:

result partial path