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,不会被解析成数字或者字符。 Co
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...
Unfortunately, in Hive 0.7.x, this query fails with the error message “Hash code on complex types not supported yet.” A multiple-insert statement uses an implicit group by, and Hive 0.7.x does not support grouping by complex types. This bug was partially addressed in 0.8, which added ...
7、ORC() Compared with RCFile format, for example, ORC file format has many advantages such as: a single file as the output of each task, which reduces the NameNode's load Hive type support including datetime, decimal, and the complex types (struct, list, map, and union) light-weight ...
DEFAULT on complex data types such as map, struct, array is not supported. 6.2.8Drop Table/ Truncate Table Drop Table DROP TABLE [IF EXISTS] table_name [PURGE]; -- (Note: PURGE available in Hive 0.14.0 and later) DROP TABLE removes metadata and data for this table. The data is actu...
data_type,有两种类型:一种是复杂类型,例如array_type(ARRAY < data_type >)、map_type(MAP < primitive_type, data_type >)、struct_type(STRUCT < col_name : data_type [COMMENT col_comment], ...>)、union_type(UNIONTYPE < data_type, data_type, ... >);简单类型有SMALLINT(占2个字节的整...
But, however large your data, and however complex your query, you should eventually get a result because Hive executes jobs using the core Hadoop framework. When you have long-running jobs in Hive, you can monitor them with the standard UI interfaces from Hadoop—the YARN monitoring UI is ...
UDFs, UDAFs, and UDTFs currently do not support complex data types other than the preceding ones. Currently, Hive UDFs supports only less than or equal to five input parameters. UDFs with more than five input parameters will fail to be registered. ...
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Hive does not support literals for complex types (array, map, struct, union), so it is not possible to use them in INSERT INTO...VALUES clauses. This means that the user cannot insert data into a complex datatype column using the INSERT INTO...VALUES clause. Examples CREATE TABLE ...