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https://issues.apache.org/jira/browse/TAJO-838?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14184043#comment-14184043
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ASF GitHub Bot commented on TAJO-838:
-------------------------------------
Github user jihoonson commented on a diff in the pull request:
https://github.com/apache/tajo/pull/192#discussion_r19374759
--- Diff:
tajo-algebra/src/main/java/org/apache/tajo/algebra/CreateIndex.java ---
@@ -0,0 +1,129 @@
+/*
+ * 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
+ *
+ * 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.
+ */
+
+package org.apache.tajo.algebra;
+
+import com.google.common.base.Objects;
+import com.google.gson.annotations.Expose;
+import com.google.gson.annotations.SerializedName;
+import org.apache.tajo.algebra.Sort.SortSpec;
+import org.apache.tajo.util.TUtil;
+
+import java.util.Map;
+
+public class CreateIndex extends UnaryOperator {
+ @Expose @SerializedName("IsUnique")
+ private boolean unique = false;
+ @Expose @SerializedName("IndexName")
+ private String indexName;
+ @Expose @SerializedName("SortSpecs")
+ private SortSpec[] sortSpecs;
+ @Expose @SerializedName("Properties")
+ private Map<String, String> params;
+ @Expose @SerializedName("IndexMethodSpec")
+ private IndexMethodSpec methodSpec;
+
+ public CreateIndex(final String indexName, final SortSpec[] sortSpecs) {
+ super(OpType.CreateIndex);
+ this.indexName = indexName;
+ this.sortSpecs = sortSpecs;
+ this.methodSpec = new IndexMethodSpec("TWO_LEVEL_BIN_TREE");
+ }
+
+ public void setUnique(boolean unique) {
+ this.unique = unique;
+ }
+
+ public boolean isUnique() {
+ return this.unique;
+ }
+
+ public void setIndexName(String indexName) {
+ this.indexName = indexName;
+ }
+
+ public String getIndexName() {
+ return indexName;
+ }
+
+ public void setSortSpecs(SortSpec[] sortSpecs) {
--- End diff --
SortSpec[] contains indexing keys.
> Improve query planner to utilize index
> --------------------------------------
>
> Key: TAJO-838
> URL: https://issues.apache.org/jira/browse/TAJO-838
> Project: Tajo
> Issue Type: Sub-task
> Components: planner/optimizer
> Reporter: Jihoon Son
> Assignee: Jihoon Son
> Priority: Minor
>
> Index can improve the query performance when the selectivity of query is high.
> Thus, query planner should decide whether index is used or not for a given
> query.
> The selectivity can be guessed using statistics.
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