org.eigenbase.relopt
Interface RelOptSchemaWithSampling

All Superinterfaces:

RelOptSchema

All Known Implementing Classes:

FarragoPreparingStmt, LucidDbPreparingStmt, SqlToRelTestBase.MockRelOptSchema

public interface RelOptSchemaWithSampling
extends RelOptSchema

Extension to RelOptSchema with support for sample datasets.

Version:

$Id: //open/dev/farrago/src/org/eigenbase/relopt/RelOptSchemaWithSampling.java#7 $

Author:

jhyde

See Also:

RelOptConnection, RelOptSchema

Method Summary

RelOptTable

getTableForMember(String[] names, String datasetName, boolean[] usedDataset) Retrieves a RelOptTable based upon a member access, using a sample dataset if it exists.

Methods inherited from interface org.eigenbase.relopt.RelOptSchema

getTableForMember, getTypeFactory, registerRules

Method Detail

getTableForMember

RelOptTable getTableForMember(String[] names,
                              String datasetName,
                              boolean[] usedDataset)

Retrieves a RelOptTable based upon a member access, using a sample dataset if it exists.

Parameters:

names - Compound name of table

datasetName - Name of sample dataset to substitute, if it exists; null to not look for a sample

usedDataset - Output parameter which is set to true if a sample dataset is found; may be null

Returns:

Table, or null if not found