* skip over the region start key that prefixes index rows.
* @param rootExpression the root expression from which to begin traversal
* @param offset the offset to set on each RowKeyColumnExpression
*/
public static void setRowKeyExpressionOffset(Expression rootExpression, final int offset) {
rootExpression.accept(new RowKeyExpressionVisitor() {
@Override
public Void visit(RowKeyColumnExpression node) {
node.setOffset(offset);
return null;