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Posted to commits@kylin.apache.org by lu...@apache.org on 2015/07/15 14:38:58 UTC
svn commit: r1691198 [5/17] - in /incubator/kylin/site: ./ blog/
blog/2015/01/25/introduce-data-model/
blog/2015/06/10/release-v0.7.1-incubating/ cn/docs/ cn/docs/install/
cn/docs/tutorial/ cn/download/ docs/ docs/development/ docs/gettingstarted/
docs...
Added: incubator/kylin/site/docs/development/new_metadata.html
URL: http://svn.apache.org/viewvc/incubator/kylin/site/docs/development/new_metadata.html?rev=1691198&view=auto
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--- incubator/kylin/site/docs/development/new_metadata.html (added)
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+<!--
+* Licensed to the Apache Software Foundation (ASF) under one
+* or more contributor license agreements. See the NOTICE file
+* distributed with this work for additional information
+* regarding copyright ownership. The ASF licenses this file
+* to you under the Apache License, Version 2.0 (the
+* "License"); you may not use this file except in compliance
+* with the License. You may obtain a copy of the License at
+*
+* http://www.apache.org/licenses/LICENSE-2.0
+*
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+* distributed under the License is distributed on an "AS IS" BASIS,
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+*
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+*
+* Unless required by applicable law or agreed to in writing, software
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+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+-->
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+<div class="col-md-3 col-lg-3 col-xs-4 aside1 visible-md visible-lg" id="nside1" style=" padding-top: 2em">
+ <ul class="nav nav-pills nav-stacked">
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+ <li><a href="#titleGetting Started" data-toggle="collapse" id="navtitle">Getting Started</a></li>
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+</div>
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+ <li><a href="#titleInstallation" data-toggle="collapse" id="navtitle">Installation</a></li>
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+ <li><a href="/docs/install/kylin_cluster.html" class="list-group-item-lay pjaxlink">Multiple Kylin REST servers</a></li>
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+ <li><a href="/docs/install/advance_settings.html" class="list-group-item-lay pjaxlink">Advance settings of Kylin environment</a></li>
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+ <li><a href="/docs/install/kylin_docker.html" class="list-group-item-lay pjaxlink">On Hadoop Kylin installation using Docker</a></li>
+
+
+
+
+
+
+
+
+ <ul>
+ </div>
+</div>
+
+ <li><a href="#titleTutorial" data-toggle="collapse" id="navtitle">Tutorial</a></li>
+ <div class="collapse in">
+ <div class="list-group" id="list1">
+ <ul style="list-style-type:disc">
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+ <li><a href="/docs/tutorial/create_cube.html" class="list-group-item-lay pjaxlink">Kylin Cube Creation Tutorial</a></li>
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+ <li><a href="/docs/tutorial/cube_build_job.html" class="list-group-item-lay pjaxlink">Kylin Cube Build and Job Monitoring Tutorial</a></li>
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+ <li><a href="/docs/tutorial/tableau.html" class="list-group-item-lay pjaxlink">Kylin and Tableau Tutorial</a></li>
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+ <ul>
+ </div>
+</div>
+
+ <li><a href="#titleHow To" data-toggle="collapse" id="navtitle">How To</a></li>
+ <div class="collapse in">
+ <div class="list-group" id="list1">
+ <ul style="list-style-type:disc">
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+ <h1 class="post-title">New meta data model structure</h1>
+
+ <p>version: v0.7.2, since: v0.7.1</p>
+
+
+ <p>Kylin is doing a round code refactor which will introduce the following two changes on meta data:</p>
+
+<ul>
+ <li>Abstract a âmodel_descâ layer from âcube_descâ</li>
+</ul>
+
+<p>Before define a cube, user will need firstly define a model (âmodel_descâ); The model defines which is the fact table, which are lookup tables and how they be joined;</p>
+
+<p>With the model be defined, when user define a cube (âcube_descâ), he/she only need to specify the table/column name for a dimension, as the join conditions have already been defined;</p>
+
+<p>This abstraction is to extend the meta data to fulfill non-cube queries (coming soon);</p>
+
+<ul>
+ <li>Support data tables from multiple hive databases;</li>
+</ul>
+
+<p>User has the case that tables are from multiple hive database, and the table name might be the same; To support this case Kylin will use the database name + table name as the unique name for tables; And user need to specify the database name (if it is not âdefaultâ) in SQL when query Kylin.</p>
+
+<p>Here is a sample; the fact table âtest_kylin_factâ is from default hive database, you donât need to specify the db name; while lookup table is from âedwâ, you need use âedw.test_cal_dtâ in the query:</p>
+
+<div class="highlight"><pre><code class="language-groff" data-lang="groff">select test_cal_dt.Week_Beg_Dt, sum(price) as c1, count(1) as c2
+ from test_kylin_fact
+ inner JOIN edw.test_cal_dt as test_cal_dt
+ ON test_kylin_fact.cal_dt = test_cal_dt.cal_dt
+ where test_kylin_fact.lstg_format_name='ABIN'</code></pre></div>
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