Split Driver.run() into compile() + exec()
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Key: HIVE-385
URL: https://issues.apache.org/jira/browse/HIVE-385
Project: Hadoop Hive
Issue Type: Improvement
Components: Query Processor
Reporter: Neil Conway
Currently, Driver.run() parses, analyzes, and then executes a given query
string. This isn't very flexible: it would be nice to be able to parse and
analyze a query to get a query plan, and then execute that query plan at a
later time (zero or more times). This would also be a necessary prerequisite
for supporting server-side prepared statements.
I'd like to change Driver as follows:
* Add a new method Driver.compile(String), which parses and analyzes the given
query string, and returns an object representing the planned query
* Add a new method Driver.execute(Plan), which runs the given planned query
* Reimplement run(String) as { p = compile(String); execute(p); }
Comments welcome; I should have a candidate patch ready soon.
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