net.sf.farrago.query
Class FarragoView

java.lang.Object
  org.eigenbase.relopt.RelOptAbstractTable
      net.sf.farrago.query.FarragoQueryNamedColumnSet
          net.sf.farrago.query.FarragoView

All Implemented Interfaces:

FarragoMedColumnSet, FarragoQueryColumnSet, RelOptTable, SqlValidatorTable

 class FarragoView
extends FarragoQueryNamedColumnSet

An implementation of RelOptTable for accessing a view managed by Farrago.

Version:

$Id: //open/dev/farrago/src/net/sf/farrago/query/FarragoView.java#20 $

Author:

John V. Sichi

Field Summary

private String	datasetName
private ModalityType	modality

Fields inherited from class org.eigenbase.relopt.RelOptAbstractTable

name, rowType, schema

Constructor Summary

FarragoView(FemLocalView cwmView, RelDataType rowType, String datasetName, ModalityType modality)
Creates a new FarragoView object.

Method Summary

private RelNode	expandView(String queryString)
FemLocalView	getFemView()
RelNode	toRel(RelOptCluster cluster, RelOptConnection connection) Converts this table into a relational expression.

Methods inherited from class net.sf.farrago.query.FarragoQueryNamedColumnSet

getAllowedAccess, getCwmColumnSet, getMonotonicity, getPreparingStmt, getQualifiedName, setCwmColumnSet, setPreparingStmt

Methods inherited from class org.eigenbase.relopt.RelOptAbstractTable

getCollationList, getName, getRelOptSchema, getRowCount, getRowType, setRowType

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.eigenbase.relopt.RelOptTable

getCollationList, getRelOptSchema, getRowCount, getRowType

Methods inherited from interface org.eigenbase.sql.validate.SqlValidatorTable

getRowType

Field Detail

datasetName

private final String datasetName

modality

private final ModalityType modality

Constructor Detail

FarragoView

FarragoView(FemLocalView cwmView,
            RelDataType rowType,
            String datasetName,
            ModalityType modality)

Creates a new FarragoView object.

Parameters:

cwmView - catalog definition for view

rowType - type for rows produced by view

datasetName - Name of sample dataset, or null to use vanilla

modality -

Method Detail

getFemView

public FemLocalView getFemView()

toRel

public RelNode toRel(RelOptCluster cluster,
                     RelOptConnection connection)

Description copied from interface: RelOptTable

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

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

expandView

private RelNode expandView(String queryString)