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https://issues.apache.org/jira/browse/TAJO-87?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13722106#comment-13722106
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Jinho Kim commented on TAJO-87:
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Hyunsik,
The error handling code in the new parser is omitted. If you are ok, I'll move
the error handling code from the old parser to new parser.
> 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
>
> Attachments: TAJO-87.patch
>
>
> 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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