question: @ Override public List < CarbonDictionaryColumnMetaChunk > read ( ) throws IOException { List < CarbonDictionaryColumnMetaChunk > dictionaryMetaChunks = new ArrayList < CarbonDictionaryColumnMetaChunk > ( CarbonCommonConstants . DEFAULT_COLLECTION_SIZE ) ; CarbonDictionaryColumnMetaChunk columnMetaChunk = null ; ColumnDictionaryChunkMeta dictionaryChunkMeta = null ; openThriftReader ( ) ; while ( dictionaryMetadataFileReader . hasNext ( ) ) { dictionaryChunkMeta = ( ColumnDictionaryChunkMeta ) dictionaryMetadataFileReader . read ( ) ; columnMetaChunk = getNewInstanceOfCarbonDictionaryColumnMetaChunk ( dictionaryChunkMeta ) ; dictionaryMetaChunks . add ( columnMetaChunk ) ; } return dictionaryMetaChunks ; }
target:  This method will be used to read complete metadata file. Applicable scenarios: 1. Query execution. Whenever a query is executed then to read the dictionary file and define the query scope first dictionary metadata has to be read first. 2. If dictionary file is read using start and end offset then using this meta list we can count the total number of dictionary chunks present between the 2 offsets