net.sf.saffron.ext
Class ExtentTable

java.lang.Object
  |
  +--net.sf.saffron.ext.AbstractTable
        |
        +--net.sf.saffron.ext.ExtentTable

All Implemented Interfaces:

SaffronTable

public class ExtentTable

extends AbstractTable

ExtentTable is a relational expression formed by all of the instances of a given class. It is transformed into an ExtentRel.

Field Summary

Fields inherited from class net.sf.saffron.ext.AbstractTable

name, rowType, schema

Constructor Summary

ExtentTable(SaffronSchema schema, String name, SaffronType rowType)

Method Summary

SaffronRel

toRel(VolcanoCluster cluster, SaffronConnection schemaExp) Converts this table into a relational expression.

Methods inherited from class net.sf.saffron.ext.AbstractTable

getName, getQualifiedName, getRowCount, getRowType, getSaffronSchema

Methods inherited from class java.lang.Object

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

Constructor Detail

ExtentTable

public ExtentTable(SaffronSchema schema,
                   String name,
                   SaffronType rowType)

Method Detail

toRel

public SaffronRel toRel(VolcanoCluster cluster,
                        SaffronConnection schemaExp)

Description copied from interface: SaffronTable

Converts this table into a relational expression.

The planner calls this method to convert a table into an initial relational expression, generally something abstract, such as a TableAccessRel, then optimizes this expression by applying rules to transform it into more efficient access methods for this table.

Parameters:

cluster - the cluster the relational expression will belong to

schemaExp - the parse tree of the expression which evaluates to a connection object