code: public boolean dropTriggers(String tableName, String columnName) {
  		boolean dropped = has(tableName, columnName);
  		if (dropped) {
  			dropAllTriggers(tableName, columnName);
  		}
  		return dropped;
  	}
docs: Check if the table and column has the RTree extension and if found, drop
  the triggers
  
  @param tableName
  table name
  @param columnName
  column name
  @return true if dropped