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https://issues.apache.org/jira/browse/DRILL-7077?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16800391#comment-16800391
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ASF GitHub Bot commented on DRILL-7077:
---------------------------------------
cgivre commented on pull request #1680: DRILL-7077: Add Function to Facilitate
Time Series Analysis
URL: https://github.com/apache/drill/pull/1680#discussion_r268484099
##########
File path:
contrib/udfs/src/main/java/org/apache/drill/exec/udfs/NearestDateUtils.java
##########
@@ -0,0 +1,149 @@
+/*
+ * 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.drill.exec.udfs;
+
+import org.apache.drill.common.exceptions.DrillRuntimeException;
+
+import java.time.temporal.TemporalAdjusters;
+import java.time.LocalDateTime;
+import java.time.DayOfWeek;
+import java.time.temporal.ChronoUnit;
+import java.util.Arrays;
+
+public class NearestDateUtils {
+ /**
+ * Specifies the time grouping to be used with the nearest date function
+ */
+ private enum TimeInterval {
+ YEAR,
+ QUARTER,
+ MONTH,
+ WEEK_SUNDAY,
+ WEEK_MONDAY,
+ DAY,
+ HOUR,
+ HALF_HOUR,
+ QUARTER_HOUR,
+ MINUTE,
+ HALF_MINUTE,
+ QUARTER_MINUTE,
+ SECOND
+ }
+
+ private static final org.slf4j.Logger logger =
org.slf4j.LoggerFactory.getLogger(NearestDateUtils.class);
Review comment:
Fixed
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> Add Function to Facilitate Time Series Analysis
> -----------------------------------------------
>
> Key: DRILL-7077
> URL: https://issues.apache.org/jira/browse/DRILL-7077
> Project: Apache Drill
> Issue Type: New Feature
> Reporter: Charles Givre
> Assignee: Charles Givre
> Priority: Major
> Labels: doc-impacting
> Fix For: 1.16.0
>
>
> When analyzing time based data, you will often have to aggregate by time
> grains. While some time grains will be easy to calculate, others, such as
> quarter, can be quite difficult. These functions enable a user to quickly and
> easily aggregate data by various units of time. Usage is as follows:
> {code:java}
> SELECT <fields>
> FROM <data>
> GROUP BY nearestDate(<timestamp_column>, <time increment>{code}
> So let's say that a user wanted to count the number of hits on a web server
> per 15 minute, the query might look like this:
> {code:java}
> SELECT nearestDate(`eventDate`, '15MINUTE' ) AS eventDate,
> COUNT(*) AS hitCount
> FROM dfs.`log.httpd`
> GROUP BY nearestDate(`eventDate`, '15MINUTE'){code}
> Currently supports the following time units:
> * YEAR
> * QUARTER
> * MONTH
> * WEEK_SUNDAY
> * WEEK_MONDAY
> * DAY
> * HOUR
> * HALF_HOUR / 30MIN
> * QUARTER_HOUR / 15MIN
> * MINUTE
> * 30SECOND
> * 15SECOND
> * SECOND
>
>
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