hive官方手册:https://cwiki.apache.org/confluence/display/Hive/LanguageManual+Types#LanguageManualTypes-TimestampstimestampTimestamps hive的数据类型有五大类型: primitive_type :原始类型 array_type :数组 map_type :map struct_type :结构体 union_type :联合体 一、primitive_type原始类型 以下是hive的原始...
BINARY存储在记录中,不想BLOB单独存储,可以在BINARY中包含任意字节序列,会原样存储,不会被解析成数字或者字符。 Complex Data Types Hive还支持一些关系型数据库不支持的复合数据类型。 复合数据类型由primitive data types和other complex data types构成,如下: ARRAY - 相同类型的元素构成的序列,从0开始索引,与Java中...
我们可以把String,TimeStamp值转换成Date类型: Miscellaneous Types Hive还提供两种primitive data types,BOOLEAN和BINARY。和Java的Boolean相似,BOOLEAN只存储true或者false。 BINARY是字节数组,和很多关系型数据库的VARBINARY相似。BINARY存储在记录中,不想BLOB单独存储,可以在BINARY中包含任意字节序列,会原样存储,不会被解析...
15.导入数据: LOAD DATA LOCAL INPATH '${env:HOME}/california-employees' [ overwrite ] INTO TABLE employees PARTITION (country = 'US', state = 'CA'); 16. Primitive data types Type Size Literal syntax examples TINYINT 1byte signed integer. 20 SMALLINT 2 byte signed integer. 20 INT 4 byt...
CREATE(DATABASE|SCHEMA)[IFNOTEXISTS]database_name[COMMENTdatabase_comment][LOCATIONhdfs_path][MANAGEDLOCATIONhdfs_path][WITHDBPROPERTIES(property_name=property_value,...)]; LOCATION 是指定外部表的存储路径,MANAGEDLOCATION 是指定管理表的存储路径(hive 4.0.0 才支持),官方建议默认就行,让所有的表都在一...
user_3g_age_area{city=wu, age=wu} stats: [numFiles=1, numRows=3, totalSize=30, rawDataSize=27] MapReduce Jobs Launched: Stage-Stage-1: Map: 1 Cumulative CPU: 1.97 sec HDFS Read: 4613 HDFS Write: 122 SUCCESS Total MapReduce CPU Time Spent: 1 seconds 970 msec OK Time taken: ...
dataType dataType string The data types which can be used for custom object values.Add a distributor accountOperation ID: AddAnAccountIntoTheAddressBookOfADistributor Add an account to the address book of a distributor. Parameters Expandir tabla NameKeyRequiredTypeDescription Manufacturer ID manufacturer...
size.key = 10000hive.mapj oin .cache .num rows = 10000Group ByMap端部分聚合,并不是所有的聚合操作都需要在Reduce端完成,很多聚合操作都可以先在Map端进行部分聚合,最后在 Reduce端得出最终结果基于Hash参数包括:hive.map.aggr = true/是否在 Map端进行聚合,默认为 Truehive.gr 14、oupby.mapaggr.check...
[HIVE-19334] - Use actual file size rather than stats for fetch task optimization with external tables [HIVE-19336] - Disable SMB/Bucketmap join for external tables [HIVE-19340] - Disable timeout of transactions opened by replication task at target cluster ...
file footer contains a list of stripes in the file, the number of rows per stripe, and each column's data type. It also contains column-level aggregates count, min, max, and sum. postscript holds compression parameters and the size of the compressed footer. ...