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From "Hyunsik Choi (JIRA)" <j...@apache.org>
Subject [jira] [Created] (TAJO-87) Integration of tajo algebra module and SQL parser.
Date Thu, 18 Jul 2013 01:44:48 GMT
Hyunsik Choi created TAJO-87:

             Summary: Integration of tajo algebra module and SQL parser.
                 Key: TAJO-87
                 URL: https://issues.apache.org/jira/browse/TAJO-87
             Project: Tajo
          Issue Type: Improvement
          Components: parser
            Reporter: Hyunsik Choi
            Assignee: Hyunsik Choi
             Fix For: 0.2-incubating

In the current implementation, QueryAnalyzer transforms a sql statement into a data structure
that represents a parser tree and a query block. They has the following limitations: 
 * They can't support multiple block queries including table and scalar subqueries. 
 * They are tightly coupled to a certain grammar.

Before ASF incubation, I have developed tajo-algebra and tajo-frontend-sql. Tajo-algebra is
a kind of intermediate layer. It represents a just relational algebraic expression. With this,
we can do more interesting things. For example, we can enable users to describe a logical
plan for a certain query. It also very helpful to support an another DSL.

For this work, tajo-algebra should be improved to support full specifications, and we should
rewrite a SQL parser to use tajo-algebra.

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