select named_struct('name','xiaosong','age',18,'weight',80); --输出:{"name":"xiaosong","age":18,"weight":80} 参考资料 凌岸:HIVE SQL 代码优化总结(容易踩坑的地方) 高威:HIVE-SQL优化(持续更新ing) 钟林子钰:30分钟掌握 Hive SQL 优化(解决数据倾斜) 如何通俗地理解Hive的工作原理? - 普...
1. 创建表 首先,我们需要创建一个包含struct类型的Hive表。 CREATETABLEemployee(emp_idINT,emp_name STRING,emp_details STRUCT<age:INT,department:STRING,salary:DOUBLE>); 1. 2. 3. 4. 5. 2. 插入数据 接下来,插入一些数据到这个表中。 INSERTINTOemployeeVALUES(1,'Alice',named_struct('age',30,'de...
Hive is designed to enable easy data summarization, ad-hoc querying and analysis of large volumes of data. It provides SQL which enables users to do ad-hoc querying, summarization and data analysis easily. At the same time, Hive's SQL gives users multiple places to integrate their own functi...
SQL 複製 INSERT INTO TABLE lineitem_orc SELECT L_ORDERKEY as L_ORDERKEY, L_PARTKEY as L_PARTKEY , L_SUPPKEY as L_SUPPKEY, L_LINENUMBER as L_LINENUMBER, L_QUANTITY as L_QUANTITY, L_EXTENDEDPRICE as L_EXTENDEDPRICE, L_DISCOUNT as L_DISCOUNT, L_TAX as L_TAX, L_RETURNFLAG as...
Struct 数据类型的使用 创建测试表: createtableifnotexistsstruct_test( users struct<id:int,name:string,age:int>)rowformat delimited fields terminatedby'\t'; 往刚刚创建的表中插入一些测试数据: insertintotablestruct_testvalues(named_struct("id",1001,"name","Mary","age",20)),(named_struct("id...
map (key1, value1, key2, value2, ...) Creates a map with the given key/value pairs struct (val1, val2, val3, ...) Creates a struct with the given field values. Struct field names will be col1, col2, ... named_struct (name1, val1, name2, val2, ...) Creates a struct...
3>. 最终插入复杂表的SQL with deds as ( select name,str_to_map(concat_ws(',',collect_set(concat_ws(':',dedkey,cast(dedval as string))),",",":") deductions from test.emp group by name ), adds as( select name,collect_set(named_struct('stree',stree,'city',city,'state',state...
array(val1,val2,...): 给定一系列值,创建array map(key1,value1,...): 给定键值对,创建map struct(val1,val2,..): 给定一系列值,创建struct named_struct(name1,val1,...): 创建struct,并指定名称 条件判断 if(BOOLEAN condition,val1,val2) : val1 if condition=True else val1 isnotnull(a...
不一样的,这个示例named_struct_1字段事先就存成了struct类型。 那接下来老老实实建一个array(struct)格式字段来处理吧 (1)数据准备-建表insert-select:直接将map转array后不能用inline的数据存成array(struct):不能,会报错字段类型不匹配。 这里有点奇怪,hive是schema on read,insert的时候会检查字段格式是否...
hive中named_struct构造和使用 2018-11-28 14:35 −... 大数据-大道至简 0 11412 Hive教程(1) 2019-05-10 16:36 −1. 介绍 Apache Hive可以使用SQL来读,写,管理分布式存储的大数据集,结构可以投射到已经存储的数据上,命令行工具和JDBC驱动可以让用户连接到Hive。 2. 安装和配置 你可以下载Hive的稳定版...