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From ravipes...@apache.org
Subject [39/50] carbondata git commit: [CARBONDATA-2783][BloomDataMap][Doc] Update document for bloom filter datamap
Date Mon, 30 Jul 2018 18:43:05 GMT
[CARBONDATA-2783][BloomDataMap][Doc] Update document for bloom filter datamap

add example for enable/disable datamap

This closes #2554


Project: http://git-wip-us.apache.org/repos/asf/carbondata/repo
Commit: http://git-wip-us.apache.org/repos/asf/carbondata/commit/d691d49d
Tree: http://git-wip-us.apache.org/repos/asf/carbondata/tree/d691d49d
Diff: http://git-wip-us.apache.org/repos/asf/carbondata/diff/d691d49d

Branch: refs/heads/branch-1.4
Commit: d691d49d4fb5924269f620cd68c7ccb84b95a806
Parents: 0a6fe08
Author: Manhua <kevinjmh@qq.com>
Authored: Wed Jul 25 16:51:49 2018 +0800
Committer: ravipesala <ravi.pesala@gmail.com>
Committed: Tue Jul 31 00:11:26 2018 +0530

----------------------------------------------------------------------
 docs/datamap/bloomfilter-datamap-guide.md | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)
----------------------------------------------------------------------


http://git-wip-us.apache.org/repos/asf/carbondata/blob/d691d49d/docs/datamap/bloomfilter-datamap-guide.md
----------------------------------------------------------------------
diff --git a/docs/datamap/bloomfilter-datamap-guide.md b/docs/datamap/bloomfilter-datamap-guide.md
index 0fb3ba2..325a508 100644
--- a/docs/datamap/bloomfilter-datamap-guide.md
+++ b/docs/datamap/bloomfilter-datamap-guide.md
@@ -26,7 +26,16 @@ Showing all DataMaps on this table
   SHOW DATAMAP
   ON TABLE main_table
   ```
-It will show all DataMaps created on main table.
+
+Disable Datamap
+> The datamap by default is enabled. To support tuning on query, we can disable a specific
datamap during query to observe whether we can gain performance enhancement from it. This
will only take effect current session.
+
+  ```
+  // disable the datamap
+  SET carbon.datamap.visible.dbName.tableName.dataMapName = false
+  // enable the datamap
+  SET carbon.datamap.visible.dbName.tableName.dataMapName = true
+  ```
 
 
 ## BloomFilter DataMap Introduction


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