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https://issues.apache.org/jira/browse/DRILL-7117?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16804400#comment-16804400
]
ASF GitHub Bot commented on DRILL-7117:
---------------------------------------
amansinha100 commented on pull request #1715: DRILL-7117: Support creation of
equi-depth histogram for selected dat…
URL: https://github.com/apache/drill/pull/1715#discussion_r270230184
##########
File path:
exec/java-exec/src/main/java/org/apache/drill/exec/expr/fn/impl/TDigestFunctions.java
##########
@@ -0,0 +1,1126 @@
+/*
+ * 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.expr.fn.impl;
+
+import io.netty.buffer.DrillBuf;
+import org.apache.drill.exec.expr.DrillAggFunc;
+import org.apache.drill.exec.expr.DrillSimpleFunc;
+import org.apache.drill.exec.expr.annotations.FunctionTemplate;
+import org.apache.drill.exec.expr.annotations.FunctionTemplate.FunctionScope;
+import org.apache.drill.exec.expr.annotations.FunctionTemplate.NullHandling;
+import org.apache.drill.exec.expr.annotations.Output;
+import org.apache.drill.exec.expr.annotations.Param;
+import org.apache.drill.exec.expr.annotations.Workspace;
+import org.apache.drill.exec.expr.holders.BigIntHolder;
+import org.apache.drill.exec.expr.holders.NullableBigIntHolder;
+import org.apache.drill.exec.expr.holders.BitHolder;
+import org.apache.drill.exec.expr.holders.NullableBitHolder;
+import org.apache.drill.exec.expr.holders.NullableIntHolder;
+import org.apache.drill.exec.expr.holders.NullableFloat8Holder;
+import org.apache.drill.exec.expr.holders.NullableFloat4Holder;
+import org.apache.drill.exec.expr.holders.Float8Holder;
+import org.apache.drill.exec.expr.holders.Float4Holder;
+import org.apache.drill.exec.expr.holders.DateHolder;
+import org.apache.drill.exec.expr.holders.TimeHolder;
+import org.apache.drill.exec.expr.holders.TimeStampHolder;
+import org.apache.drill.exec.expr.holders.NullableDateHolder;
+import org.apache.drill.exec.expr.holders.NullableTimeHolder;
+import org.apache.drill.exec.expr.holders.NullableTimeStampHolder;
+import org.apache.drill.exec.expr.holders.ObjectHolder;
+import org.apache.drill.exec.expr.holders.IntHolder;
+import org.apache.drill.exec.expr.holders.NullableVarBinaryHolder;
+import org.apache.drill.exec.expr.holders.VarCharHolder;
+import org.apache.drill.exec.expr.holders.VarBinaryHolder;
+import org.apache.drill.exec.expr.holders.NullableVarCharHolder;
+import org.apache.drill.exec.server.options.OptionManager;
+import org.apache.drill.exec.vector.AllocationHelper;
+import org.apache.drill.exec.vector.RepeatedFloat8Vector;
+
+import javax.inject.Inject;
+
+@SuppressWarnings("unused")
+public class TDigestFunctions {
+ static final org.slf4j.Logger logger =
org.slf4j.LoggerFactory.getLogger(TDigestFunctions.class);
+
+ private TDigestFunctions(){}
+
+ @FunctionTemplate(name = "tdigest", scope =
FunctionTemplate.FunctionScope.POINT_AGGREGATE)
+ public static class BigIntTDigestFunction implements DrillAggFunc {
+ @Param BigIntHolder in;
+ @Workspace ObjectHolder work;
+ @Output NullableVarBinaryHolder out;
+ @Inject DrillBuf buffer;
Review comment:
The `buffer` is being used in the output() method below.
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> Support creation of histograms for numeric data types (except Decimal) and
> date/time/timestamp
> ----------------------------------------------------------------------------------------------
>
> Key: DRILL-7117
> URL: https://issues.apache.org/jira/browse/DRILL-7117
> Project: Apache Drill
> Issue Type: Sub-task
> Components: Query Planning & Optimization
> Reporter: Aman Sinha
> Assignee: Aman Sinha
> Priority: Major
> Fix For: 1.16.0
>
>
> This JIRA is specific to creating histograms for numeric data types: INT,
> BIGINT, FLOAT4, FLOAT8 and their corresponding nullable/non-nullable
> versions. Additionally, since DATE/TIME/TIMESTAMP are internally stored as
> longs, we should allow the same numeric type histogram creation for these
> data types as well.
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