Github user chenliang613 commented on a diff in the pull request:
https://github.com/apache/carbondata/pull/1193#discussion_r129508099
--- Diff: docs/ddl-operation-on-carbondata.md ---
@@ -101,6 +101,14 @@ The following DDL operations are supported in
CarbonData :
- All dimensions except complex datatype columns are part of multi
dimensional key(MDK). This behavior can be overridden by using TBLPROPERTIES.
If the user wants to keep any column (except columns of complex datatype) in
multi dimensional key then he can keep the columns either in DICTIONARY_EXCLUDE
or DICTIONARY_INCLUDE.
+ - **Sort Columns Configuration**
+
+ It is used to specify the multi dimensional key(MDK) columns. By
default MDK is composed of all dimension columns except complex datatype
column.
+
--- End diff --
here, need give the description for "SORT_COLUMN" property:
"SORT_COLUMN" property is for users to specify which columns belong to the
MDK index.
If user don't specify "SORT_COLUMN" property, by default MDK index be built
by using all dimension columns except complex datatype column.
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