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Posted to dev@tajo.apache.org by "Hyunsik Choi (JIRA)" <ji...@apache.org> on 2013/07/18 03:44:48 UTC
[jira] [Created] (TAJO-87) Integration of tajo algebra module and
SQL parser.
Hyunsik Choi created TAJO-87:
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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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