THIS IS A TEST INSTANCE. ALL YOUR CHANGES WILL BE LOST!!!!
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-- create partition T@ds=1/hr=1 to T@ds=1/hr=24 alter table Tdep add partition (ds=1); |
The metastore stores the following dependencies
- Tdep depends on T, and T is dependent upon by Tdep
- Tdep@ds=1 depends on T@ds=1
In some usecases, it is possible that some partitions of Tdep depends on T, whereas the newer partitions of Tdep depend on T2.
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create table T (key string, value string) partitioned by (ds string, hr string);
-- create a dependent table which specifies the dependencies explicitly
-- Tdep inherits the schema of T
-- Tdep is partitioned by a prefix of T (either ds or ds,hr)
create dependent table Tdep partitioned by (ds string) depends on table T;
-- create partition T@ds=1/hr=1 to T@ds=1/hr=24
alter table Tdep add partition (ds=1);
-- repeat this for T@ds=1 to T@ds=10
-- T is being deprecated, and T2 is the new table (with the same schema, possibly partitioned on different keys)
create table T2 (key string, value string) partitioned by (ds string, hr string, min string);
alter table Tdep depends on table T2;
-- create partition T2@ds=11/hr=1/min=1 to T2@ds=11/hr=24/min=60
alter table Tdep add partition (ds=1);
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The metastore stores the following dependencies
- Tdep depends on (T,T2), and (T,T2) are dependent upon by Tdep
- T and T2 have the same schema
- Tdep@ds=1..Tdep@ds=10 depends on T@ds=1..T@ds=10 respectively
- Tdep@ds=11 depends on T2@ds=11