GitHub user QiangCai opened a pull request:
https://github.com/apache/incubator-carbondata/pull/757
[CARBONDATA-782]support SORT_COLUMNS
The tasks of SORT_COLUMNS:
Support create table with sort_columns property.
e.g. tblproperties('sort_columns' = 'col7,col3')
The table with SORT_COLUMNS property will be sorted by SORT_COLUMNS. The
order of columns is decided by SORT_COLUMNS.
Change the encoding rule of SORT_COLUMNS
Firstly, the rule of column encoding will keep consistent with previous.
Secondly, if a column of SORT_COLUMNS is a measure before, now this column
will be created as a dimension. And this dimension is a no-dicitonary
column(Better to use other direct-dictionary).
Thirdly, the dimension of SORT_COLUMNS have RLE and ROWID page, other
dimension have only RLE(not sorted).
The start/end key should be composed of SORT_COLUMNS.
Using SORT_COLUMNS to build start/end key during data loading and select
query.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/QiangCai/incubator-carbondata nosorttables
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/incubator-carbondata/pull/757.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 #757
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commit 043ded68a347a61924458f12bcd2be1c784b5cb9
Author: QiangCai <[email protected]>
Date: 2017-03-02T09:48:54Z
sort columns
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