org.apache.iotdb.db.utils

类 QueryUtils

java.lang.Object

org.apache.iotdb.db.utils.QueryUtils

public class QueryUtils
extends Object

方法概要

限定符和类型	方法和说明
static void	fillOrderIndexes(QueryDataSource dataSource, String deviceId, boolean ascending)
static void	filterQueryDataSource(QueryDataSource queryDataSource, TsFileFilter fileFilter)
static ValueIterator	generateValueIterator(Object[] values)
static Predicate<Long>	getPredicate(long minBound, long maxBound, boolean ascending)
static void	modifyAlignedChunkMetaData(List<AlignedChunkMetadata> chunkMetaData, List<List<Modification>> modifications)
static void	modifyChunkMetaData(List<? extends IChunkMetadata> chunkMetaData, List<Modification> modifications) modifyChunkMetaData iterates the chunkMetaData and applies all available modifications on it to generate a ModifiedChunkMetadata.

从类继承的方法 java.lang.Object

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

方法详细资料

modifyChunkMetaData

public static void modifyChunkMetaData(List<? extends IChunkMetadata> chunkMetaData,
                                       List<Modification> modifications)

modifyChunkMetaData iterates the chunkMetaData and applies all available modifications on it to generate a ModifiedChunkMetadata.
the caller should guarantee that chunkMetaData and modifications refer to the same time series paths.

参数:

chunkMetaData - the original chunkMetaData.

modifications - all possible modifications.

modifyAlignedChunkMetaData

public static void modifyAlignedChunkMetaData(List<AlignedChunkMetadata> chunkMetaData,
                                              List<List<Modification>> modifications)

filterQueryDataSource

public static void filterQueryDataSource(QueryDataSource queryDataSource,
                                         TsFileFilter fileFilter)

generateValueIterator

public static ValueIterator generateValueIterator(Object[] values)

fillOrderIndexes

public static void fillOrderIndexes(QueryDataSource dataSource,
                                    String deviceId,
                                    boolean ascending)

getPredicate

public static Predicate<Long> getPredicate(long minBound,
                                           long maxBound,
                                           boolean ascending)

返回:

A predicate used to judge whether the current timestamp is out of time range, returns true if it is.