public static List<String> getSelectionColumns(
List<String> selectionColumns, IndexSegment indexSegment) {
if ((selectionColumns.size() == 1) && selectionColumns.get(0).equals("*")) {
selectionColumns.clear();
for (final String columnName : indexSegment.getColumnNames()) {
selectionColumns.add(columnName);
}
}
return selectionColumns;
}
public static String[] extractSelectionRelatedColumns(
Selection selection, IndexSegment indexSegment) {
Set<String> selectionColumns = new HashSet<String>();
selectionColumns.addAll(selection.getSelectionColumns());
if ((selectionColumns.size() == 1)
&& ((selectionColumns.toArray(new String[0]))[0].equals("*"))) {
selectionColumns.clear();
selectionColumns.addAll(Arrays.asList(indexSegment.getColumnNames()));
}
if (selection.getSelectionSortSequence() != null) {
for (SelectionSort selectionSort : selection.getSelectionSortSequence()) {
selectionColumns.add(selectionSort.getColumn());
}
}
return selectionColumns.toArray(new String[0]);
}
