Apache Derby Database Engine and Embedded JDBC Driver 10.17.1.0 · org.apache.derby.impl.sql.execute.GenericAggregateResultSet

Modifier and Type	Field and Description
protected AggregatorInfoList	aggInfoList
protected GenericAggregator[]	aggregates
protected NoPutResultSet	originalSource
private final ExecIndexRow	rowTemplate
public NoPutResultSet	source

Access	Constructor and Description
pack-priv	GenericAggregateResultSet(NoPutResultSet s, int aggregateItem, Activation activation a, int reference to a saved row allocator instance ra, int result set number resultSetNumber, double optimizer estimated row count optimizerEstimatedRowCount, double optimizer estimated cost optimizerEstimatedCost) Constructor

Method Summary

Modifier and Type	Method and Description
public void	finish() Overrides org.apache.derby.impl.sql.execute.BasicNoPutResultSetImpl.finish. Implements org.apache.derby.iapi.sql.ResultSet.finish. Tells the system that there will be no more access to any database information via this result set; in particular, no more calls to open().
protected final ExecIndexRow	Returns: the result row. If the input row != null, then the result row == input row finishAggregation(ExecIndexRow the row to finish aggregation row) Finish the aggregation for the current row.
pack-priv ExecIndexRow	Returns: a row template of the right shape for this result set getRowTemplate() Get a template row of the right shape for sorting or returning results.
protected final GenericAggregator[]	Returns: the array of GenericAggregators getSortAggregators(AggregatorInfoList the list of aggregators to set up list, boolean should distincts be ignored. Used to toss out distinct aggregates for a prelim sort. eliminateDistincts, LanguageConnectionContext the lcc lcc, NoPutResultSet the incoming result set inputResultSet) For each AggregatorInfo in the list, generate a GenericAggregator and stick it in an array of GenericAggregators.
public Element	toXML(Element Node to put content into. parentNode, String Element tag for content tag) Overrides org.apache.derby.impl.sql.execute.BasicNoPutResultSetImpl.toXML. Implements org.apache.derby.iapi.sql.ResultSet.toXML. Produce an xml image of this ResultSet and its descendant ResultSets.

Field Detail

aggInfoList	back to summary
protected AggregatorInfoList aggInfoList

aggregates	back to summary
protected GenericAggregator[] aggregates

originalSource	back to summary
protected NoPutResultSet originalSource

rowTemplate	back to summary
private final ExecIndexRow rowTemplate

source	back to summary
public NoPutResultSet source

Constructor Detail

GenericAggregateResultSet	back to summary
pack-priv GenericAggregateResultSet(NoPutResultSet s, int aggregateItem, Activation a, int ra, int resultSetNumber, double optimizerEstimatedRowCount, double optimizerEstimatedCost) throws StandardException Constructor Parameters a:Activation activation ra:int reference to a saved row allocator instance resultSetNumber:int result set number optimizerEstimatedRowCount:double optimizer estimated row count optimizerEstimatedCost:double optimizer estimated cost Exceptions StandardException: Thrown on error

GenericAggregateResultSet

back to summary

pack-priv GenericAggregateResultSet(NoPutResultSet s, int aggregateItem, Activation a, int ra, int resultSetNumber, double optimizerEstimatedRowCount, double optimizerEstimatedCost) throws StandardException

Constructor

Parameters

a:Activation: activation
ra:int: reference to a saved row allocator instance
resultSetNumber:int: result set number
optimizerEstimatedRowCount:double: optimizer estimated row count
optimizerEstimatedCost:double: optimizer estimated cost

Exceptions

StandardException:: Thrown on error

Method Detail

finish	back to summary
public void finish() throws StandardException Overrides org.apache.derby.impl.sql.execute.BasicNoPutResultSetImpl.finish. Implements org.apache.derby.iapi.sql.ResultSet.finish. Doc from org.apache.derby.iapi.sql.ResultSet.finish. Tells the system that there will be no more access to any database information via this result set; in particular, no more calls to open(). Will close the result set if it is not already closed. Annotations @Override Exceptions StandardException: on error

finish

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public void finish() throws StandardException

Overrides org.apache.derby.impl.sql.execute.BasicNoPutResultSetImpl.finish.

Implements org.apache.derby.iapi.sql.ResultSet.finish.

Doc from org.apache.derby.iapi.sql.ResultSet.finish.

Tells the system that there will be no more access to any database information via this result set; in particular, no more calls to open(). Will close the result set if it is not already closed.

Annotations

@Override

Exceptions

StandardException:: on error

finishAggregation	back to summary
protected final ExecIndexRow finishAggregation(ExecIndexRow row) throws StandardException Finish the aggregation for the current row. Basically call finish() on each aggregator on this row. Called once per grouping on a vector aggregate or once per table on a scalar aggregate. If the input row is null, then rowAllocator is invoked to create a new row. That row is then initialized and used for the output of the aggregation. Parameters row:ExecIndexRow the row to finish aggregation Returns:ExecIndexRow the result row. If the input row != null, then the result row == input row Exceptions StandardException: Thrown on error

finishAggregation

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protected final ExecIndexRow finishAggregation(ExecIndexRow row) throws StandardException

Finish the aggregation for the current row. Basically call finish() on each aggregator on this row. Called once per grouping on a vector aggregate or once per table on a scalar aggregate. If the input row is null, then rowAllocator is invoked to create a new row. That row is then initialized and used for the output of the aggregation.

Parameters

row:ExecIndexRow: the row to finish aggregation

Returns:ExecIndexRow

the result row. If the input row != null, then the result row == input row

Exceptions

StandardException:: Thrown on error

getRowTemplate	back to summary
pack-priv ExecIndexRow getRowTemplate() Get a template row of the right shape for sorting or returning results. The template is cached, so it may need to be cloned if callers use it for multiple purposes at the same time. Returns:ExecIndexRow a row template of the right shape for this result set

getRowTemplate

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pack-priv ExecIndexRow getRowTemplate()

Get a template row of the right shape for sorting or returning results. The template is cached, so it may need to be cloned if callers use it for multiple purposes at the same time.

Returns:ExecIndexRow: a row template of the right shape for this result set

getSortAggregators	back to summary
protected final GenericAggregator[] getSortAggregators(AggregatorInfoList list, boolean eliminateDistincts, LanguageConnectionContext lcc, NoPutResultSet inputResultSet) throws StandardException For each AggregatorInfo in the list, generate a GenericAggregator and stick it in an array of GenericAggregators. Parameters list:AggregatorInfoList the list of aggregators to set up eliminateDistincts:boolean should distincts be ignored. Used to toss out distinct aggregates for a prelim sort. lcc:LanguageConnectionContext the lcc inputResultSet:NoPutResultSet the incoming result set Returns:GenericAggregator[] the array of GenericAggregators Annotations @SuppressWarnings:UseOfObsoleteCollectionType Exceptions StandardException: on error

getSortAggregators

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protected final GenericAggregator[] getSortAggregators(AggregatorInfoList list, boolean eliminateDistincts, LanguageConnectionContext lcc, NoPutResultSet inputResultSet) throws StandardException

For each AggregatorInfo in the list, generate a GenericAggregator and stick it in an array of GenericAggregators.

Parameters

list:AggregatorInfoList: the list of aggregators to set up
eliminateDistincts:boolean: should distincts be ignored. Used to toss out distinct aggregates for a prelim sort.
lcc:LanguageConnectionContext: the lcc
inputResultSet:NoPutResultSet: the incoming result set

Returns:GenericAggregator[]

the array of GenericAggregators

Annotations

@SuppressWarnings:UseOfObsoleteCollectionType

Exceptions

StandardException:: on error

toXML	back to summary
public Element toXML(Element parentNode, String tag) throws Exception Overrides org.apache.derby.impl.sql.execute.BasicNoPutResultSetImpl.toXML. Implements org.apache.derby.iapi.sql.ResultSet.toXML. Doc from org.apache.derby.iapi.sql.ResultSet.toXML. Produce an xml image of this ResultSet and its descendant ResultSets. Appends an element to the parentNode and returns the appended element. Parameters parentNode:Element Node to put content into. tag:String Element tag for content Returns:Element the content as an element with the given tag name Exceptions Exception: on error

toXML

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public Element toXML(Element parentNode, String tag) throws Exception

Overrides org.apache.derby.impl.sql.execute.BasicNoPutResultSetImpl.toXML.

Implements org.apache.derby.iapi.sql.ResultSet.toXML.

Doc from org.apache.derby.iapi.sql.ResultSet.toXML.

Produce an xml image of this ResultSet and its descendant ResultSets. Appends an element to the parentNode and returns the appended element.

Parameters