| /* |
| * 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.exec.expr.DrillSimpleFunc; |
| import org.apache.drill.exec.expr.annotations.FunctionTemplate; |
| import org.apache.drill.exec.expr.annotations.Output; |
| import org.apache.drill.exec.expr.annotations.Param; |
| import org.apache.drill.exec.expr.holders.BigIntHolder; |
| import org.apache.drill.exec.expr.holders.Float8Holder; |
| import org.apache.drill.exec.expr.holders.TimeStampHolder; |
| |
| |
| public class TimeBucketFunctions { |
| |
| /** |
| * This function is used for facilitating time series analysis by creating buckets of time intervals. See |
| * https://blog.timescale.com/blog/simplified-time-series-analytics-using-the-time_bucket-function/ for usage. The function takes two arguments: |
| * 1. The timestamp in nanoseconds |
| * 2. The desired bucket interval IN MILLISECONDS |
| * |
| * The function returns a BIGINT of the nearest time bucket. |
| */ |
| @FunctionTemplate(name = "time_bucket_ns", |
| scope = FunctionTemplate.FunctionScope.SIMPLE, |
| nulls = FunctionTemplate.NullHandling.NULL_IF_NULL) |
| public static class TimeBucketNSFunction implements DrillSimpleFunc { |
| |
| @Param |
| BigIntHolder inputDate; |
| |
| @Param |
| BigIntHolder interval; |
| |
| @Output |
| BigIntHolder out; |
| |
| @Override |
| public void setup() { |
| } |
| |
| @Override |
| public void eval() { |
| // Get the timestamp in nanoseconds |
| long timestamp = inputDate.value; |
| |
| // Get the interval in milliseconds and convert to nanoseconds |
| long groupByInterval = interval.value * 1000000; |
| |
| out.value = timestamp - (timestamp % groupByInterval); |
| } |
| } |
| |
| /** |
| * This function is used for facilitating time series analysis by creating buckets of time intervals. See |
| * https://blog.timescale.com/blog/simplified-time-series-analytics-using-the-time_bucket-function/ for usage. The function takes two arguments: |
| * 1. The timestamp in milliseconds |
| * 2. The desired bucket interval IN milliseconds |
| * |
| * The function returns a BIGINT of the nearest time bucket. |
| */ |
| @FunctionTemplate(name = "time_bucket", |
| scope = FunctionTemplate.FunctionScope.SIMPLE, |
| nulls = FunctionTemplate.NullHandling.NULL_IF_NULL) |
| public static class TimeBucketFunction implements DrillSimpleFunc { |
| |
| @Param |
| BigIntHolder inputDate; |
| |
| @Param |
| BigIntHolder interval; |
| |
| @Output |
| BigIntHolder out; |
| |
| @Override |
| public void setup() { |
| } |
| |
| @Override |
| public void eval() { |
| // Get the timestamp in milliseconds |
| long timestamp = inputDate.value; |
| |
| // Get the interval in milliseconds |
| long groupByInterval = interval.value; |
| |
| out.value = timestamp - (timestamp % groupByInterval); |
| } |
| } |
| |
| /** |
| * This function is used for facilitating time series analysis by creating buckets of time intervals. See |
| * https://blog.timescale.com/blog/simplified-time-series-analytics-using-the-time_bucket-function/ for usage. The function takes two arguments: |
| * 1. The timestamp (as a Drill timestamp) |
| * 2. The desired bucket interval IN milliseconds |
| * |
| * The function returns a BIGINT of the nearest time bucket. |
| */ |
| @FunctionTemplate(name = "time_bucket", |
| scope = FunctionTemplate.FunctionScope.SIMPLE, |
| nulls = FunctionTemplate.NullHandling.NULL_IF_NULL) |
| public static class TimestampTimeBucketFunction implements DrillSimpleFunc { |
| |
| @Param |
| TimeStampHolder inputDate; |
| |
| @Param |
| BigIntHolder interval; |
| |
| @Output |
| TimeStampHolder out; |
| |
| @Override |
| public void setup() { |
| } |
| |
| @Override |
| public void eval() { |
| // Get the timestamp in milliseconds |
| long timestamp = inputDate.value; |
| |
| // Get the interval in milliseconds |
| long groupByInterval = interval.value; |
| |
| out.value = (timestamp - (timestamp % groupByInterval)); |
| } |
| } |
| |
| /** |
| * This function is used for facilitating time series analysis by creating buckets of time intervals. See |
| * https://blog.timescale.com/blog/simplified-time-series-analytics-using-the-time_bucket-function/ for usage. The function takes two arguments: |
| * 1. The timestamp (as a Drill timestamp) |
| * 2. The desired bucket interval IN milliseconds |
| * |
| * The function returns a BIGINT of the nearest time bucket. |
| */ |
| @FunctionTemplate(name = "time_bucket", |
| scope = FunctionTemplate.FunctionScope.SIMPLE, |
| nulls = FunctionTemplate.NullHandling.NULL_IF_NULL) |
| public static class DoubleTimeBucketFunction implements DrillSimpleFunc { |
| |
| @Param |
| Float8Holder inputDate; |
| |
| @Param |
| BigIntHolder interval; |
| |
| @Output |
| BigIntHolder out; |
| |
| @Override |
| public void setup() { |
| } |
| |
| @Override |
| public void eval() { |
| // Get the timestamp in milliseconds |
| long timestamp = java.lang.Math.round(inputDate.value); |
| |
| // Get the interval in milliseconds |
| long groupByInterval = interval.value; |
| |
| out.value = timestamp - (timestamp % groupByInterval); |
| } |
| } |
| } |