GitHub user rahulforallp reopened a pull request:
https://github.com/apache/carbondata/pull/1367
[CARBONDATA-1398] Support query from specified segments
**1. **Objective**** : Support Query from specified segments.
**2. **Proposed Solution** :**
A new property will introduce to set the segment no.
User will set property(carbon.input.segments. <database_name>
.<table_name>) to specify segment no.
During CarbonScan data will be read from from specified segments only.
If property is not set, all segments will be caonsidered as default
behavior.
**3. Syntax Used :**
**To show all the segments.**
It will display one new column at the end that will
display the new segment- id of compacted
segment.
> Syntax : SHOW SEGMENTS FOR TABLE <table_name>;
`e.g. => show segments for table carbon_table;`
**TO set the segment ids.**
Segment ids to which we need to query, can be set to property
carbon.input.segments (new) .
Following syntax can be used to set segment ids from client(BEELINE)
> Syntax : SET carbon.input.segments.<databese_name>.<table_name> = <list
of segment ids>;
`e.g => SET carbon.input.segments.default.carbontable=1,4,5;`
To reset the segment id.
Above property can be set to default behavior as follow.
Following syntax can be used to reset segment ids from client(BEELINE)
> Syntax : SET carbon.input.segments.<databese_name>.<table_name> = *;
`e.g => SET carbon.input.segments.default.carbontable=*`
To reset all properties.
It resets all the properties to default value. So it is recommended to use
only when you want to reset all the different properties.
> Syntax : RESET;
`e.g => reset;`
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/rahulforallp/incubator-carbondata
CARBONDATA-1398
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/carbondata/pull/1367.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #1367
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commit a630de7de54342c83ee2f294653ca7e285efb7c0
Author: rahulforallp <[email protected]>
Date: 2017-09-14T13:14:09Z
[CARBONDATA-1398] support query from specified segments
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