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From "Andrew Purtell (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HBASE-1002) Small query language for filters
Date Tue, 15 Dec 2009 23:59:18 GMT

     [ https://issues.apache.org/jira/browse/HBASE-1002?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Andrew Purtell updated HBASE-1002:
----------------------------------

    Issue Type: Sub-task  (was: Improvement)
        Parent: HBASE-2000

> Small query language for filters
> --------------------------------
>
>                 Key: HBASE-1002
>                 URL: https://issues.apache.org/jira/browse/HBASE-1002
>             Project: Hadoop HBase
>          Issue Type: Sub-task
>          Components: filters
>            Reporter: Andrew Purtell
>            Priority: Minor
>
> Improve the usability of filters by making them specifiable or executable using a little
query language. 
> For example:
>     col("entry:price") > 3 && (col("entry:name") = "ABC" || col("entry:name")
= "XYZ")
> Can be implemented as a little language compiler that takes filter specifications as
input and builds the requisite hierarchy of filter API classes and actions as emitted java
code. 
> Compiler can be a utility class, something like:
> {code}
> Scan scan = new Scan();
> scan.addFamily(Bytes.toBytes("entry"));
> // ...
> scan.setFilter(Filter.compile("col(\"entry:price\") > 3 && 
> (col(\"entry:name\") =  \"ABC\" || col(\"entry:name\") = \"XYZ\""));
> // ...
> {code}
> or even something like
> {code}
> Scan scan = Filter.compileScan("col(\"entry:price\") > 3 && 
> (col(\"entry:name\") =  \"ABC\" || col(\"entry:name\") = \"XYZ\""));
> // ...
> {code}
> Can also be implemented using JRuby snippets sent to the regionserver for execution,
but this has troublesome security implications.

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