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-                      r7267
+                      r7968
 #endregion
-using System;
 using System.Collections.Generic;
 using System.Linq;
-using System.Text;
 using HeuristicLab.DataImporter.Data;
 using HeuristicLab.DataImporter.Data.CommandBase;
 …
       base.Execute();
       ColumnGroup tempColumnGroup = new ColumnGroup();
       Dictionary<int, object> positions = new Dictionary<int, object>();
+      HashSet<int> positions = new HashSet<int>();
       ColumnBase column;
 …
         column = ColumnGroup.GetColumn(AffectedColumns[col]);
         for (int row = 0; row < ColumnGroup.RowCount; row++) {
           if (column.GetValue(row) == null && !positions.ContainsKey(row))
             positions[row] = null;
+          if (column.GetValue(row) == null && !positions.Contains(row))
+            positions.Add(row);
+        }
+      }
 …
       for (int i = 0; i < ColumnGroup.RowCount; i++)
         if (!positions.ContainsKey(i))
+        if (!positions.Contains(i))
           tempColumnGroup.AddRow(ColumnGroup.GetRow(i));

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Changeset 7968 for branches/HeuristicLab.DataImporter/HeuristicLab.DataImporter.Command/MissingValues/DeleteRowsWithMissingValuesCommand.cs