edu.berkeley.cs186.database.query

Class SequentialScanOperator

java.lang.Object

edu.berkeley.cs186.database.query.QueryOperator

edu.berkeley.cs186.database.query.SequentialScanOperator

public class SequentialScanOperator
extends QueryOperator

Nested Class Summary

Nested classes/interfaces inherited from class edu.berkeley.cs186.database.query.QueryOperator

QueryOperator.OperatorType

Constructor Summary

Constructors

Constructor and Description
SequentialScanOperator(Database.Transaction transaction, String tableName) Creates a new SequentialScanOperator that provides an iterator on all tuples in a table.

Method Summary

Methods

Modifier and Type	Method and Description
Schema	computeSchema()
Iterator<Record>	execute()

Methods inherited from class edu.berkeley.cs186.database.query.QueryOperator

checkColumnNameEquality, checkSchemaForColumn, getDestination, getOutputSchema, getSource, getType, isGroupBy, isIndexScan, isJoin, isSelect, isSequentialScan, isWhere, setDestination, setOutputSchema, setSource

Methods inherited from class java.lang.Object

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

Constructor Detail

SequentialScanOperator

public SequentialScanOperator(Database.Transaction transaction,
                      String tableName)
                       throws QueryPlanException,
                              DatabaseException

Creates a new SequentialScanOperator that provides an iterator on all tuples in a table. NOTE: Sequential scans don't take a source operator because they must always be at the bottom of the DAG.

Parameters:

transaction -

tableName -

Throws:

QueryPlanException

DatabaseException

Method Detail

execute

public Iterator<Record> execute()
                         throws DatabaseException

Specified by:

execute in class QueryOperator

Throws:

DatabaseException

computeSchema

public Schema computeSchema()
                     throws QueryPlanException

Specified by:

computeSchema in class QueryOperator

Throws:

QueryPlanException