In short, for your questions: Does CLUSTER BY guarantee a global order? No. DISTRIBUTE BY puts the same keys into same reducers but what about the adjacent keys? Depends on the hash function, which depends on your query. related question: How does the built-in Apache Hive hash function work and where can I find that … Read more
With Intellij IDEA 8.1.3 the mechnism of choice is called ‘Facet’. To instantly test HQL queries: create a data source Tools -> Data Source, Add Data Source, define driver, username and password of yor development db in case you dont have already a hibernate.cfg or you configure your session factory in a different way than … Read more
from AUTOS a where a.model in (select m.model from MODELS m) or Query query1 = session.createQuery(“select s.id from Salary s where s.salary < 50000 AND s.salary > 49980”); Query query2 = session.createQuery(“from Employee e where e.id in (:ids)”).setParameterList(“ids”, query1.list()); query2.list();
You haven’t defined the “gs” alias. You only have “ags” and “tgs”.
Currently, the theta-style on joining the unrelated classes in the where clause using HQL only supports inner join. The request for supporting the outer join for such situation is currently the 3-rd most voted enhancement but I don’t think this feature will be implemented in the near feature as it requires the re-implementation of the … Read more
HQL supports CAST (if underlying database supports it), you can use it: select a.id as id,a.name as name,b.address as address from Personal as a,Home as b where cast(a.id as string) = b.studid See also: 16.10. Expressions
This question is thoroughly explained on Hibernate FAQ: First, you need to understand SQL and how OUTER JOINs work in SQL. If you do not fully understand and comprehend outer joins in SQL, do not continue reading this FAQ item but consult a SQL manual or tutorial. Otherwise you will not understand the following explanation … Read more
SQL queries use column names while HQL queries use Class properties. You’re selecting artifact_id from Classification but the Classification class has no property named ‘artifact_id’. To fix it, use the class property in your HQL. SELECT artifactId FROM Classification
The @Modifying annotation must be placed on the updateMaterialInventory method, along to the @Query annotation, to let Spring-data know that the query is not a query used to select values, but to update values.
A shorter answer: yes, CLUSTER BY guarantees global ordering, provided you’re willing to join the multiple output files yourself. The longer version: ORDER BY x: guarantees global ordering, but does this by pushing all data through just one reducer. This is basically unacceptable for large datasets. You end up one sorted file as output. SORT … Read more