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https://issues.apache.org/jira/browse/TAJO-922?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14501264#comment-14501264
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ASF GitHub Bot commented on TAJO-922:
-------------------------------------
Github user jihoonson commented on a diff in the pull request:
https://github.com/apache/tajo/pull/535#discussion_r28643177
--- Diff:
tajo-core/src/main/java/org/apache/tajo/engine/function/builtin/NtileDouble.java
---
@@ -0,0 +1,105 @@
+/**
+ * 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.engine.function.builtin;
+
+import org.apache.tajo.catalog.CatalogUtil;
+import org.apache.tajo.catalog.Column;
+import org.apache.tajo.common.TajoDataTypes;
+import org.apache.tajo.datum.Datum;
+import org.apache.tajo.datum.DatumFactory;
+import org.apache.tajo.datum.Int8Datum;
+import org.apache.tajo.engine.function.annotation.Description;
+import org.apache.tajo.engine.function.annotation.ParamTypes;
+import org.apache.tajo.plan.function.AggFunction;
+import org.apache.tajo.plan.function.FunctionContext;
+import org.apache.tajo.storage.Tuple;
+
+@Description(
+ functionName = "ntile",
+ description = "integer ranging from 1 to the argument value",
+ example = "> SELECT ntile(expr);",
+ returnType = TajoDataTypes.Type.INT8,
+ paramTypes = {@ParamTypes(paramTypes = {TajoDataTypes.Type.INT8})}
+)
+public class NtileDouble extends AggFunction<Datum> {
--- End diff --
Why ```NtileDouble``` and ```NtileInt``` are separately maintained?
> Add NTH_VALUE window function
> -----------------------------
>
> Key: TAJO-922
> URL: https://issues.apache.org/jira/browse/TAJO-922
> Project: Tajo
> Issue Type: Sub-task
> Components: function/udf, physical operator
> Reporter: Hyunsik Choi
> Assignee: Seungun Choe
> Fix For: window function
>
> Attachments: TAJO-922.patch
>
>
> The NTH_VALUE window function returns the value of the specified row of the
> window frame relative to the first row of the window. We need to implement it.
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