Package org.apache.iotdb.db.query.timegenerator

Class ServerTimeGenerator

java.lang.Object

org.apache.iotdb.tsfile.read.query.timegenerator.TimeGenerator

org.apache.iotdb.db.query.timegenerator.ServerTimeGenerator

public class ServerTimeGenerator
extends org.apache.iotdb.tsfile.read.query.timegenerator.TimeGenerator

A timestamp generator for query with filter. e.g. For query clause "select s1, s2 from root where s3 < 0 and time > 100", this class can iterate back to every timestamp of the query.

Field Summary

Fields

Modifier and Type	Field	Description
protected QueryContext	context
protected RawDataQueryPlan	queryPlan

Fields inherited from class org.apache.iotdb.tsfile.read.query.timegenerator.TimeGenerator

operatorNode

Constructor Summary

Constructors

Constructor	Description
ServerTimeGenerator(QueryContext context)
ServerTimeGenerator(QueryContext context, RawDataQueryPlan queryPlan)	Constructor of EngineTimeGenerator.

Method Summary

Modifier and Type	Method	Description
protected org.apache.iotdb.tsfile.read.reader.IBatchReader	generateNewBatchReader(org.apache.iotdb.tsfile.read.expression.impl.SingleSeriesExpression expression)
org.apache.iotdb.tsfile.read.filter.basic.Filter	getTimeFilter()
protected org.apache.iotdb.tsfile.read.filter.basic.Filter	getTimeFilter(org.apache.iotdb.tsfile.read.filter.basic.Filter filter)	extract time filter from a value filter
protected boolean	isAscending()
void	serverConstructNode(org.apache.iotdb.tsfile.read.expression.IExpression expression)

Methods inherited from class org.apache.iotdb.tsfile.read.query.timegenerator.TimeGenerator

construct, constructNode, getValue, getValues, hasNext, hasOrNode, next

Methods inherited from class java.lang.Object

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

Field Detail

context

protected QueryContext context

queryPlan

protected RawDataQueryPlan queryPlan

Constructor Detail

ServerTimeGenerator

public ServerTimeGenerator(QueryContext context)

ServerTimeGenerator

public ServerTimeGenerator(QueryContext context,
                           RawDataQueryPlan queryPlan)
                    throws StorageEngineException

Constructor of EngineTimeGenerator.

Throws:

StorageEngineException

Method Detail

serverConstructNode

public void serverConstructNode(org.apache.iotdb.tsfile.read.expression.IExpression expression)
                         throws java.io.IOException,
                                StorageEngineException,
                                QueryProcessException

Throws:

java.io.IOException

StorageEngineException

QueryProcessException

generateNewBatchReader

protected org.apache.iotdb.tsfile.read.reader.IBatchReader generateNewBatchReader(org.apache.iotdb.tsfile.read.expression.impl.SingleSeriesExpression expression)
                                                                           throws java.io.IOException

Specified by:

generateNewBatchReader in class org.apache.iotdb.tsfile.read.query.timegenerator.TimeGenerator

Throws:

java.io.IOException

getTimeFilter

protected org.apache.iotdb.tsfile.read.filter.basic.Filter getTimeFilter(org.apache.iotdb.tsfile.read.filter.basic.Filter filter)

extract time filter from a value filter

isAscending

protected boolean isAscending()

Specified by:

isAscending in class org.apache.iotdb.tsfile.read.query.timegenerator.TimeGenerator

getTimeFilter

public org.apache.iotdb.tsfile.read.filter.basic.Filter getTimeFilter()

Specified by:

getTimeFilter in class org.apache.iotdb.tsfile.read.query.timegenerator.TimeGenerator