Saturday, 8 February 2014

Hive Complex Data Types with Examples

There are three complex types in hive,

arrays: It is an ordered collection of elements.The elements in the array must be of the same type.

map: It is an unordered collection of key-value pairs.Keys must be of primitive types.Values can be of any type.

struct: It is a collection of elements of different types.

Examples: complex datatypes

ARRAY:

$ cat >arrayfile
1,abc,40000,a$b$c,hyd
2,def,3000,d$f,bang

hive> create table tab7(id int,name string,sal bigint,sub array<string>,city string)
    > row format delimited  
    > fields terminated by ','
    > collection items terminated by '$';

hive>select sub[2] from tab7 where id=1;

hive>select sub[0] from tab7;

MAP:

$ cat >mapfile
1,abc,40000,a$b$c,pf#500$epf#200,hyd
2,def,3000,d$f,pf#500,bang

hive>create table tab10(id int,name string,sal bigint,sub array<string>,dud map<string,int>,city string)
row format delimited
fields terminated by ','
collection items terminated by '$'
map keys terminated by '#';

hive> load data local inpath '/home/training/mapfile' overwrite into table tab10;

hive>select dud["pf"] from tab10;

hive>select dud["pf"],dud["epf"] from tab10;

STRUCT:

cat >mapfile
1,abc,40000,a$b$c,pf#500$epf#200,hyd$ap$500001
2,def,3000,d$f,pf#500,bang$kar$600038

hive> create table tab11(id int,name string,sal bigint,sub array<string>,dud map<string,int>,addr struct<city:string,state:string,pin:bigint>)
    > row format delimited
    > fields terminated by ','
    > collection items terminated by '$'
    > map keys terminated by '#';

hive> load data local inpath '/home/training/structfile' into table tab11;

hive>select addr.city from tab11;

13 comments:

  1. Hi BalaNarayanaReddy , Thanks for ur information . Please tell me abount the architecture of the Hadoop -- Hive.

    ReplyDelete
  2. above examples is very good.Thank u....
    can you explain Hive Architecture..

    ReplyDelete
  3. Thanks for the examples :)

    ReplyDelete
  4. Great examples!

    ReplyDelete
  5. excellent clear examples! Thank you!

    ReplyDelete
  6. Exactly what I was looking for. thanks for your post.

    ReplyDelete
  7. Thank you for the post .

    ReplyDelete