Shengsheng Huang created HIVE-3561:
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Summary: Full SQL-compliant parser for Hive
Key: HIVE-3561
URL: https://issues.apache.org/jira/browse/HIVE-3561
Project: Hive
Issue Type: Sub-task
Components: Query Processor
Affects Versions: 0.10.0
Reporter: Shengsheng Huang
To build a full SQL compliant engine on Hive, we'll need a full SQL complant
parser. The current Hive parser missed a lot of grammar units from standard
SQL. To support full SQL there're possibly four approaches:
1.Extend the existing Hive parser to support full SQL constructs. We need to
modify the current Hive.g and add any missing grammar units and resolve
conflicts.
2.Reuse an existing open source SQL compliant parser and extend it to support
Hive extensions. We may need to adapt Semantic Analyzers to the new AST
structure.
3.Reuse an existing SQL compliant parser and make it co-exist with the existing
Hive parser. Both parsers share the same CliDriver interface. Use a query mode
configuration to switch the query mode between SQL and HQL (this is the
approach we're now using in the 0.9.0 demo project)
4.Reuse an existing SQL compliant parser and make it co-exist with the existing
Hive parser. Use a separate xxxCliDriver interface for standard SQL.
Let's discuss which is the best approach.
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