Lars Francke created HIVE-20287:
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Summary: Document the differences between managed and external
tables
Key: HIVE-20287
URL: https://issues.apache.org/jira/browse/HIVE-20287
Project: Hive
Issue Type: Improvement
Components: Documentation
Reporter: Lars Francke
Assignee: Lars Francke
We should document all the differences between managed and external tables. I
need everyone's help for that though.
This is what I know:
* ARCHIVE/UNARCHIVE - DDLTask - Only works for managed tables
* TRUNCATE - DDLSemanticAnalyzer - Only works for managed tables
* MERGE/CONCATENATE - HiveRelOpMaterializationValidator - Only works for
managed tables
* Constraints - DDLSemanticAnalyzer - (NOT NULL, DEFAULT, CHECK, only RELY ist
allowed)
* IMPORT - ImportSemanticAnalyzer - This has some wild restrictions I didn't
follow for external tables
* Query Results Caching - https://issues.apache.org/jira/browse/HIVE-18513
SemanticAnalyzer
Hortonworks has extra documentation listing these things:
* Query cache
* Materialized views, except in a limited way
* Default statistics gathering
* Compute queries using statistics
* Automatic runtime filtering
* File merging after insert
It'd be great if someone (from Hortonworks or otherwise) could elaborate on
those.
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