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https://issues.apache.org/jira/browse/TAJO-919?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14278346#comment-14278346
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ASF GitHub Bot commented on TAJO-919:
-------------------------------------
Github user hyunsik commented on a diff in the pull request:
https://github.com/apache/tajo/pull/351#discussion_r22993308
--- Diff:
tajo-core/src/main/java/org/apache/tajo/engine/function/builtin/LeadDouble.java
---
@@ -0,0 +1,49 @@
+/**
+ * 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.common.TajoDataTypes.Type;
+import org.apache.tajo.engine.function.annotation.Description;
+import org.apache.tajo.engine.function.annotation.ParamTypes;
+
+@Description(
+ functionName = "lead",
+ description = "the nth previous row value of current row",
--- End diff --
It should be 'nth next row' instead of 'nth previous ...'.
> Implement LAG and LEAD window functions
> ---------------------------------------
>
> Key: TAJO-919
> URL: https://issues.apache.org/jira/browse/TAJO-919
> Project: Tajo
> Issue Type: Sub-task
> Components: function/udf, physical operator
> Reporter: Hyunsik Choi
> Fix For: window function
>
>
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