Package org.apache.iotdb.db.qp.utils

Class GroupByLevelController

java.lang.Object

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

public class GroupByLevelController
extends java.lang.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.

Field Summary

Fields

Modifier and Type	Field	Description
static java.lang.String	ALIAS_ERROR_MESSAGE1
static java.lang.String	ALIAS_ERROR_MESSAGE2

Constructor Summary

Constructors

Constructor	Description
GroupByLevelController(int seriesLimit, int[] levels)
GroupByLevelController(QueryOperator operator)

Method Summary

Modifier and Type	Method	Description
void	control(ResultColumn rawColumn, java.util.List<ResultColumn> resultColumns)
static GroupByLevelController	deserialize(java.nio.ByteBuffer byteBuffer)
java.lang.String	generatePartialPathByLevel(boolean isCountStar, org.apache.iotdb.commons.path.PartialPath rawPath, int[] pathLevels)	Transform an originalPath to a partial path that satisfies given level.
java.lang.String	getAlias(java.lang.String originName)
java.lang.String	getGroupedPath(java.lang.String rawPath)
void	serialize(java.nio.ByteBuffer byteBuffer)

Methods inherited from class java.lang.Object

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

Field Detail

ALIAS_ERROR_MESSAGE1

public static java.lang.String ALIAS_ERROR_MESSAGE1

ALIAS_ERROR_MESSAGE2

public static java.lang.String ALIAS_ERROR_MESSAGE2

Constructor Detail

GroupByLevelController

public GroupByLevelController(int seriesLimit,
                              int[] levels)

GroupByLevelController

public GroupByLevelController(QueryOperator operator)

Method Detail

getGroupedPath

public java.lang.String getGroupedPath(java.lang.String rawPath)

getAlias

public java.lang.String getAlias(java.lang.String originName)

control

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

Throws:

LogicalOptimizeException

generatePartialPathByLevel

public java.lang.String generatePartialPathByLevel(boolean isCountStar,
                                                   org.apache.iotdb.commons.path.PartialPath rawPath,
                                                   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.

Returns:

result partial path

serialize

public void serialize(java.nio.ByteBuffer byteBuffer)

deserialize

public static GroupByLevelController deserialize(java.nio.ByteBuffer byteBuffer)