question: private void clearDictionaryCache ( ) { Map < String , Dictionary > dictionaryCaches = surrogateKeyGen . getDictionaryCaches ( ) ; List < Dictionary > reverseDictionaries = new ArrayList < > ( dictionaryCaches . values ( ) ) ; for ( int i = 0 ; i < reverseDictionaries . size ( ) ; i ++ ) { Dictionary dictionary = reverseDictionaries . get ( i ) ; dictionary . clear ( ) ; } }
target:  This method will clear the dictionary access count so that any unused column can be removed from the cache