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## edu.udo.cs.miningmart.operator
Class RemoveDuplicates

    java.lang.Object
      edu.udo.cs.miningmart.operator.ExecutableOperator
          edu.udo.cs.miningmart.operator.ConceptOperator
              edu.udo.cs.miningmart.operator.SingleCSOperator
                  edu.udo.cs.miningmart.operator.RemoveDuplicates

public class RemoveDuplicates
extends SingleCSOperator

Creates a view on the input table/view that contains no two equal tuples (rows).

Version:
  $Id: RemoveDuplicates.java,v 1.3 2006/04/11 14:10:11 euler Exp $
Author:
  Timm Euler

Field Summary

Fields inherited from class edu.udo.cs.miningmart.operator.ExecutableOperator
`generatedSQLDefinitions`

Constructor Summary
`RemoveDuplicates()`

Method Summary
`java.lang.String` | `generateSQLDefinition(java.lang.String selectPart)` This method must return the SQL definition of the newly created ColumnSet.
`protected java.lang.String` | `getStringForSelection(Column inputColumn)` The superclass method is overwritten in order to create a correct SELECT String that matches the internal FROM part.
`java.lang.String` | `getTypeOfNewColumnSet()` This method must return the entry String for the M4 table "Columnset_t", indicating whether the new Columnset is a view or a table.
`protected boolean` | `mustCopyFeature(java.lang.String nameOfFeature)` This method is for operators that do not copy all Features of the input concept to the output concept.

Methods inherited from class edu.udo.cs.miningmart.operator.SingleCSOperator
`generateColumnSetsForOp, generateSQLDefinition, getNewCSName, getTypeOfNewColumnSet`

Methods inherited from class edu.udo.cs.miningmart.operator.ConceptOperator
`compileStatement, createMetadata, createMetadataForOneBA, createSingleColumnSet, createStatement, estimateStatistics, generateColumns, getInputConcept, getNewCSName, getOutputConcept, setNewCSMultiStepBranch`

Methods inherited from class edu.udo.cs.miningmart.operator.ExecutableOperator
`autoPrint, checkConditions, doPrint, doPrint, execute, executeBusinessSingleValueSqlRead, executeBusinessSingleValueSqlReadL, executeBusinessSqlRead, executeBusinessSqlWrite, executeM4SingleValueSqlRead, executeM4SingleValueSqlReadL, executeM4SqlRead, executeM4SqlWrite, getArtificalColumnName, getBusinessDbms, getHighestLoopNr, getM4Db, getM4Dbms, getM4ObjectFromCache, getName, getNextM4SequenceValue, getNumberOfLoops, getOperator, getOpParamsIterator, getParameter, getParameter, getSingleParameter, getSingleParameter, getStep, handleAssertions, isDeselectedParameter, isLoopable, isManual, isStepable, load, print, putM4ObjectToCache, showCreateStatement, storedProceduresAvailable`

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Constructor Detail

### RemoveDuplicates

    public RemoveDuplicates()

Method Detail

### generateSQLDefinition

    public java.lang.String generateSQLDefinition(java.lang.String selectPart)
                                           throws M4CompilerError

  Description copied from class: `SingleCSOperator`
  This method must return the SQL definition of the newly created ColumnSet.

  Specified by:
    `generateSQLDefinition` in class `SingleCSOperator`
  Parameters:
    `selectPart` - The SQL string between "SELECT" and "FROM" for the SQL definition to be returned.
  Returns:
    The SQL definition for the new ColumnSet.
  Throws:
    `M4CompilerError`
  See Also:
    `edu.udo.cs.miningmart.m4.core.operator.SingleCSOperator#generateSQLDefinition(String)`

### getStringForSelection

    protected java.lang.String getStringForSelection(Column inputColumn)

  The superclass method is overwritten in order to create a correct SELECT String that matches the internal FROM part.

  Overrides:
    `getStringForSelection` in class `ConceptOperator`
  Parameters:
    `inputColumn` - the given input column
  Returns:
    a String for the SELECT part of a view definition

### getTypeOfNewColumnSet

    public java.lang.String getTypeOfNewColumnSet()

  Description copied from class: `SingleCSOperator`
  This method must return the entry String for the M4 table "Columnset_t", indicating whether the new Columnset is a view or a table.

  Specified by:
    `getTypeOfNewColumnSet` in class `SingleCSOperator`
  Returns:
    The type of the new Columnset, either "V" or "T".
  See Also:
    `edu.udo.cs.miningmart.m4.core.operator.ConceptOperator#getTypeOfNewColumnSet(int)`

### mustCopyFeature

    protected boolean mustCopyFeature(java.lang.String nameOfFeature)

  Description copied from class: `ConceptOperator`
  This method is for operators that do not copy all Features of the input concept to the output concept.

  Specified by:
    `mustCopyFeature` in class `ConceptOperator`
  Parameters:
    `nameOfFeature` - Name of the feature in question.
  Returns:
    TRUE if this feature should be copied to the output concept, FALSE if not.
  See Also:
    `edu.udo.cs.miningmart.m4.core.operator.ConceptOperator#mustCopyFeature(String)`

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