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分析TsFile文件结构，然后把读取TsFile的耗时步骤进行分解和分类，最后进行实验测量统计。

TsFile结构

Image Modified

耗时分类	耗时分解
(A)get_chunkMetadatas	(A)1_index_read_deserialize_MagicString_FileMetadataSize
	(A)2_index_read_deserialize_IndexRootNode_MetaOffset_BloomFilter
	(A)3_2_index_read_deserialize_IndexRootNode_exclude_to_TimeseriesMetadata_forExactGet
(B)load_on_disk_chunk	(B)4_data_read_deserialize_ChunkHeader
(B)load_on_disk_chunk	(B)5_data_read_ChunkData
(C)get_pageHeader	(C)6_data_deserialize_PageHeader
(D-1)decompress_pageData	(D-1)7_1_data_ByteBuffer_to_ByteArray
	(D-1)7_2_data_decompress_PageDataByteArray
	(D-1)7_3_data_ByteArray_to_ByteBuffer
	(D-1)7_4_data_split_time_value_Buffer
(D-2)decode_pageData	(D-2)8_1_createBatchData
	(D-2)8_2_timeDecoder_hasNext
	(D-2)8_3_timeDecoder_readLong
	(D-2)8_4_valueDecoder_read
	(D-2)8_5_checkValueSatisfyOrNot
	(D-2)8_6_putIntoBatchData

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