net.sf.farrago.namespace.jdbc
Class MedJdbcColumnSet

java.lang.Object
  org.eigenbase.relopt.RelOptAbstractTable
      net.sf.farrago.namespace.impl.MedAbstractColumnSet
          net.sf.farrago.namespace.jdbc.MedJdbcColumnSet

All Implemented Interfaces:

FarragoMedColumnSet, FarragoQueryColumnSet, RelOptTable, SqlValidatorTable

public class MedJdbcColumnSet
extends MedAbstractColumnSet

MedJdbcColumnSet implements the FarragoMedColumnSet interface for foreign JDBC tables.

Version:

$Id: //open/dev/farrago/src/net/sf/farrago/namespace/jdbc/MedJdbcColumnSet.java#21 $

Author:

John V. Sichi

Field Summary

(package private) RelDataType	currRowType
(package private) SqlDialect	dialect
(package private) MedJdbcNameDirectory	directory
(package private) RelDataType	origRowType
(package private) SqlSelect	select
(package private) RelDataType	srcRowType

Fields inherited from class org.eigenbase.relopt.RelOptAbstractTable

name, rowType, schema

Constructor Summary

MedJdbcColumnSet(MedJdbcNameDirectory directory, String[] foreignName, String[] localName, SqlSelect select, SqlDialect dialect, RelDataType rowType, RelDataType origRowType, RelDataType srcRowType)

Method Summary

SqlDialect	getDialect()
MedJdbcNameDirectory	getDirectory()
double	getRowCount() Returns an estimate of the number of rows in the table.
private RelNode	optimizeLoopbackLink(RelOptCluster cluster, RelOptConnection connection)
protected RelNode	optimizeLoopbackLink(RelOptCluster cluster, RelOptConnection connection, String[] actualName)
RelNode	toRel(RelOptCluster cluster, RelOptConnection connection) Converts this table into a relational expression.

Methods inherited from class net.sf.farrago.namespace.impl.MedAbstractColumnSet

getAllowedAccess, getColumnPropertyMap, getCwmColumnSet, getForeignName, getLocalName, getMonotonicity, getPreparingStmt, getQualifiedName, getTableProperties, setAllowedAccess, setCwmColumnSet, setPreparingStmt, toLenientRel, toUdxRel

Methods inherited from class org.eigenbase.relopt.RelOptAbstractTable

getCollationList, getName, getRelOptSchema, 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, getRowType

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

getRowType

Field Detail

directory

final MedJdbcNameDirectory directory

select

final SqlSelect select

dialect

final SqlDialect dialect

origRowType

RelDataType origRowType

srcRowType

RelDataType srcRowType

currRowType

RelDataType currRowType

Constructor Detail

MedJdbcColumnSet

public MedJdbcColumnSet(MedJdbcNameDirectory directory,
                        String[] foreignName,
                        String[] localName,
                        SqlSelect select,
                        SqlDialect dialect,
                        RelDataType rowType,
                        RelDataType origRowType,
                        RelDataType srcRowType)

Method Detail

getRowCount

public double getRowCount()

Description copied from interface: RelOptTable

Returns an estimate of the number of rows in the table.

Specified by:

getRowCount in interface RelOptTable

Overrides:

getRowCount in class RelOptAbstractTable

getDirectory

public MedJdbcNameDirectory getDirectory()

Returns:

the directory from which this columnset originates

getDialect

public SqlDialect getDialect()

Returns:

the dialect of SQL used to access the remote DBMS

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

optimizeLoopbackLink

private RelNode optimizeLoopbackLink(RelOptCluster cluster,
                                     RelOptConnection connection)
                              throws SQLException

Throws:

SQLException

optimizeLoopbackLink

protected RelNode optimizeLoopbackLink(RelOptCluster cluster,
                                       RelOptConnection connection,
                                       String[] actualName)
                                throws SQLException

Throws:

SQLException