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apache / shardingsphere-doc / 151c08835ae7ea864d1f5130ed16e6ef8ec2acc9 / . / statistics / staging / xref / org / apache / shardingsphere / sqlfederation / optimizer / planner / rule / TranslatableProjectRule.html
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<div id="overview"><a href="../../../../../../../../apidocs/org/apache/shardingsphere/sqlfederation/optimizer/planner/rule/TranslatableProjectRule.html">View Javadoc</a></div><pre>
<a class="jxr_linenumber" name="L1" href="#L1">1</a> <em class="jxr_comment">/*</em>
<a class="jxr_linenumber" name="L2" href="#L2">2</a> <em class="jxr_comment"> * Licensed to the Apache Software Foundation (ASF) under one or more</em>
<a class="jxr_linenumber" name="L3" href="#L3">3</a> <em class="jxr_comment"> * contributor license agreements. See the NOTICE file distributed with</em>
<a class="jxr_linenumber" name="L4" href="#L4">4</a> <em class="jxr_comment"> * this work for additional information regarding copyright ownership.</em>
<a class="jxr_linenumber" name="L5" href="#L5">5</a> <em class="jxr_comment"> * The ASF licenses this file to You under the Apache License, Version 2.0</em>
<a class="jxr_linenumber" name="L6" href="#L6">6</a> <em class="jxr_comment"> * (the "License"); you may not use this file except in compliance with</em>
<a class="jxr_linenumber" name="L7" href="#L7">7</a> <em class="jxr_comment"> * the License. You may obtain a copy of the License at</em>
<a class="jxr_linenumber" name="L8" href="#L8">8</a> <em class="jxr_comment"> *</em>
<a class="jxr_linenumber" name="L9" href="#L9">9</a> <em class="jxr_comment"> * <a href="http://www.apache.org/licenses/LICENSE-2.0" target="alexandria_uri">http://www.apache.org/licenses/LICENSE-2.0</a></em>
<a class="jxr_linenumber" name="L10" href="#L10">10</a> <em class="jxr_comment"> *</em>
<a class="jxr_linenumber" name="L11" href="#L11">11</a> <em class="jxr_comment"> * Unless required by applicable law or agreed to in writing, software</em>
<a class="jxr_linenumber" name="L12" href="#L12">12</a> <em class="jxr_comment"> * distributed under the License is distributed on an "AS IS" BASIS,</em>
<a class="jxr_linenumber" name="L13" href="#L13">13</a> <em class="jxr_comment"> * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.</em>
<a class="jxr_linenumber" name="L14" href="#L14">14</a> <em class="jxr_comment"> * See the License for the specific language governing permissions and</em>
<a class="jxr_linenumber" name="L15" href="#L15">15</a> <em class="jxr_comment"> * limitations under the License.</em>
<a class="jxr_linenumber" name="L16" href="#L16">16</a> <em class="jxr_comment"> */</em>
<a class="jxr_linenumber" name="L17" href="#L17">17</a>
<a class="jxr_linenumber" name="L18" href="#L18">18</a> <strong class="jxr_keyword">package</strong> org.apache.shardingsphere.sqlfederation.optimizer.planner.rule;
<a class="jxr_linenumber" name="L19" href="#L19">19</a>
<a class="jxr_linenumber" name="L20" href="#L20">20</a> <strong class="jxr_keyword">import</strong> org.apache.calcite.plan.RelOptRule;
<a class="jxr_linenumber" name="L21" href="#L21">21</a> <strong class="jxr_keyword">import</strong> org.apache.calcite.plan.RelOptRuleCall;
<a class="jxr_linenumber" name="L22" href="#L22">22</a> <strong class="jxr_keyword">import</strong> org.apache.calcite.rel.RelNode;
<a class="jxr_linenumber" name="L23" href="#L23">23</a> <strong class="jxr_keyword">import</strong> org.apache.calcite.rel.core.RelFactories;
<a class="jxr_linenumber" name="L24" href="#L24">24</a> <strong class="jxr_keyword">import</strong> org.apache.calcite.rel.logical.LogicalProject;
<a class="jxr_linenumber" name="L25" href="#L25">25</a> <strong class="jxr_keyword">import</strong> org.apache.calcite.rex.RexInputRef;
<a class="jxr_linenumber" name="L26" href="#L26">26</a> <strong class="jxr_keyword">import</strong> org.apache.calcite.rex.RexNode;
<a class="jxr_linenumber" name="L27" href="#L27">27</a> <strong class="jxr_keyword">import</strong> org.apache.calcite.tools.RelBuilderFactory;
<a class="jxr_linenumber" name="L28" href="#L28">28</a> <strong class="jxr_keyword">import</strong> org.apache.shardingsphere.sqlfederation.optimizer.<strong class="jxr_keyword">operator</strong>.TranslatableTableScan;
<a class="jxr_linenumber" name="L29" href="#L29">29</a>
<a class="jxr_linenumber" name="L30" href="#L30">30</a> <strong class="jxr_keyword">import</strong> java.util.ArrayList;
<a class="jxr_linenumber" name="L31" href="#L31">31</a> <strong class="jxr_keyword">import</strong> java.util.List;
<a class="jxr_linenumber" name="L32" href="#L32">32</a>
<a class="jxr_linenumber" name="L33" href="#L33">33</a> <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="L34" href="#L34">34</a> <em class="jxr_javadoccomment"> * Planner rule for pushing projections into table scan.</em>
<a class="jxr_linenumber" name="L35" href="#L35">35</a> <em class="jxr_javadoccomment"> */</em>
<a class="jxr_linenumber" name="L36" href="#L36">36</a> <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">class</strong> <a name="TranslatableProjectRule" href="../../../../../../../org/apache/shardingsphere/sqlfederation/optimizer/planner/rule/TranslatableProjectRule.html#TranslatableProjectRule">TranslatableProjectRule</a> <strong class="jxr_keyword">extends</strong> RelOptRule {
<a class="jxr_linenumber" name="L37" href="#L37">37</a>
<a class="jxr_linenumber" name="L38" href="#L38">38</a> <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">final</strong> <a name="TranslatableProjectRule" href="../../../../../../../org/apache/shardingsphere/sqlfederation/optimizer/planner/rule/TranslatableProjectRule.html#TranslatableProjectRule">TranslatableProjectRule</a> INSTANCE = <strong class="jxr_keyword">new</strong> <a name="TranslatableProjectRule" href="../../../../../../../org/apache/shardingsphere/sqlfederation/optimizer/planner/rule/TranslatableProjectRule.html#TranslatableProjectRule">TranslatableProjectRule</a>(RelFactories.LOGICAL_BUILDER);
<a class="jxr_linenumber" name="L39" href="#L39">39</a>
<a class="jxr_linenumber" name="L40" href="#L40">40</a> <strong class="jxr_keyword">public</strong> <a name="TranslatableProjectRule" href="../../../../../../../org/apache/shardingsphere/sqlfederation/optimizer/planner/rule/TranslatableProjectRule.html#TranslatableProjectRule">TranslatableProjectRule</a>(<strong class="jxr_keyword">final</strong> RelBuilderFactory relBuilderFactory) {
<a class="jxr_linenumber" name="L41" href="#L41">41</a> <strong class="jxr_keyword">super</strong>(operand(LogicalProject.<strong class="jxr_keyword">class</strong>, operand(TranslatableTableScan.<strong class="jxr_keyword">class</strong>, none())), relBuilderFactory, <span class="jxr_string">"TranslatableProjectRule"</span>);
<a class="jxr_linenumber" name="L42" href="#L42">42</a> }
<a class="jxr_linenumber" name="L43" href="#L43">43</a>
<a class="jxr_linenumber" name="L44" href="#L44">44</a> @Override
<a class="jxr_linenumber" name="L45" href="#L45">45</a> <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> onMatch(<strong class="jxr_keyword">final</strong> RelOptRuleCall call) {
<a class="jxr_linenumber" name="L46" href="#L46">46</a> LogicalProject project = call.rel(0);
<a class="jxr_linenumber" name="L47" href="#L47">47</a> <strong class="jxr_keyword">int</strong>[] fields = getProjectFields(project.getProjects());
<a class="jxr_linenumber" name="L48" href="#L48">48</a> <strong class="jxr_keyword">if</strong> (0 == fields.length) {
<a class="jxr_linenumber" name="L49" href="#L49">49</a> <strong class="jxr_keyword">return</strong>;
<a class="jxr_linenumber" name="L50" href="#L50">50</a> }
<a class="jxr_linenumber" name="L51" href="#L51">51</a> <a name="TranslatableTableScan" href="../../../../../../../org/apache/shardingsphere/sqlfederation/optimizer/operator/TranslatableTableScan.html#TranslatableTableScan">TranslatableTableScan</a> scan = call.rel(1);
<a class="jxr_linenumber" name="L52" href="#L52">52</a> List&lt;RexNode&gt; expressions = project.getProjects();
<a class="jxr_linenumber" name="L53" href="#L53">53</a> <strong class="jxr_keyword">if</strong> (fields.length == expressions.size()) {
<a class="jxr_linenumber" name="L54" href="#L54">54</a> call.transformTo(<strong class="jxr_keyword">new</strong> <a name="TranslatableTableScan" href="../../../../../../../org/apache/shardingsphere/sqlfederation/optimizer/operator/TranslatableTableScan.html#TranslatableTableScan">TranslatableTableScan</a>(scan.getCluster(), scan.getTable(), scan.getTranslatableTable(), scan.getFilters(), fields));
<a class="jxr_linenumber" name="L55" href="#L55">55</a> } <strong class="jxr_keyword">else</strong> {
<a class="jxr_linenumber" name="L56" href="#L56">56</a> <a name="TranslatableTableScan" href="../../../../../../../org/apache/shardingsphere/sqlfederation/optimizer/operator/TranslatableTableScan.html#TranslatableTableScan">TranslatableTableScan</a> tableScan = <strong class="jxr_keyword">new</strong> <a name="TranslatableTableScan" href="../../../../../../../org/apache/shardingsphere/sqlfederation/optimizer/operator/TranslatableTableScan.html#TranslatableTableScan">TranslatableTableScan</a>(scan.getCluster(), scan.getTable(), scan.getTranslatableTable(), scan.getFilters(), fields, expressions.size(), expressions);
<a class="jxr_linenumber" name="L57" href="#L57">57</a> RelNode logicalProject = LogicalProject.create(tableScan, project.getHints(), project.getProjects(), project.getRowType());
<a class="jxr_linenumber" name="L58" href="#L58">58</a> call.transformTo(logicalProject);
<a class="jxr_linenumber" name="L59" href="#L59">59</a> }
<a class="jxr_linenumber" name="L60" href="#L60">60</a> }
<a class="jxr_linenumber" name="L61" href="#L61">61</a>
<a class="jxr_linenumber" name="L62" href="#L62">62</a> <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">int</strong>[] getProjectFields(<strong class="jxr_keyword">final</strong> List&lt;RexNode&gt; rexNodes) {
<a class="jxr_linenumber" name="L63" href="#L63">63</a> List&lt;Integer&gt; rexInputRefs = <strong class="jxr_keyword">new</strong> ArrayList&lt;&gt;();
<a class="jxr_linenumber" name="L64" href="#L64">64</a> <strong class="jxr_keyword">for</strong> (RexNode exp : rexNodes) {
<a class="jxr_linenumber" name="L65" href="#L65">65</a> <strong class="jxr_keyword">if</strong> (exp instanceof RexInputRef) {
<a class="jxr_linenumber" name="L66" href="#L66">66</a> rexInputRefs.add(((RexInputRef) exp).getIndex());
<a class="jxr_linenumber" name="L67" href="#L67">67</a> }
<a class="jxr_linenumber" name="L68" href="#L68">68</a> }
<a class="jxr_linenumber" name="L69" href="#L69">69</a> <strong class="jxr_keyword">int</strong>[] result = <strong class="jxr_keyword">new</strong> <strong class="jxr_keyword">int</strong>[rexInputRefs.size()];
<a class="jxr_linenumber" name="L70" href="#L70">70</a> <strong class="jxr_keyword">for</strong> (<strong class="jxr_keyword">int</strong> index = 0; index &lt; rexInputRefs.size(); index++) {
<a class="jxr_linenumber" name="L71" href="#L71">71</a> result[index] = rexInputRefs.get(index);
<a class="jxr_linenumber" name="L72" href="#L72">72</a> }
<a class="jxr_linenumber" name="L73" href="#L73">73</a> <strong class="jxr_keyword">return</strong> result;
<a class="jxr_linenumber" name="L74" href="#L74">74</a> }
<a class="jxr_linenumber" name="L75" href="#L75">75</a> }
</pre>
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