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### What is the purpose of the pull request pr for KYUUBI #939:Add Z-Order extensions to optimize table with zorder.Z-order is a technique that allows you to map multidimensional data to a single dimension. We did a performance test for this test ,we used aliyun Databricks Delta test case https://help.aliyun.com/document_detail/168137.html?spm=a2c4g.11186623.6.563.10d758ccclYtVb Prepare data for the three scenarios: 1. 10 billion data and 2 hundred files（parquet files）: for big file(1G) 2. 10 billion data and 1 thousand files（parquet files）: for medium file(200m) 3. one billion data and 10 hundred files（parquet files）: for smaller file(200k) test env： spark-3.1.2 hadoop-2.7.2 kyubbi-1.4.0 test step： Step1: create hive tables ```scala spark.sql(s"drop database if exists $dbName cascade") spark.sql(s"create database if not exists $dbName") spark.sql(s"use $dbName") spark.sql(s"create table $connRandomParquet (src_ip string, src_port int, dst_ip string, dst_port int) stored as parquet") spark.sql(s"create table $connZorderOnlyIp (src_ip string, src_port int, dst_ip string, dst_port int) stored as parquet") spark.sql(s"create table $connZorder (src_ip string, src_port int, dst_ip string, dst_port int) stored as parquet") spark.sql(s"show tables").show(false) ``` Step2： prepare data for parquet table with three scenarios we use the following code ```scala def randomIPv4(r: Random) = Seq.fill(4)(r.nextInt(256)).mkString(".") def randomPort(r: Random) = r.nextInt(65536) def randomConnRecord(r: Random) = ConnRecord( src_ip = randomIPv4(r), src_port = randomPort(r), dst_ip = randomIPv4(r), dst_port = randomPort(r)) ``` Step3： do optimize with z-order only ip， sort column： src_ip, dst_ip and shuffle partition just as file numbers . execute 'OPTIMIZE conn_zorder_only_ip ZORDER BY src_ip, dst_ip;' by kyuubi. Step4： do optimize with z-order only ip， sort column： src_ip, dst_ip and shuffle partition just as file numbers . execute 'OPTIMIZE conn_zorder ZORDER BY src_ip, src_port, dst_ip, dst_port;' by kyuubi. --------------------- # benchmark result by querying the tables before and after optimization, we find that **10 billion data and 200 files and Query resource:200 core 600G memory** | Table | Average File Size | Scan row count | Average query time | row count Skipping ratio | | ------------------- | ----------------- | -------------- | ------------------ | ------------------------ | | conn_random_parquet | 1.2 G | 10,000,000,000 | 27.554 s | 0.0% | | conn_zorder_only_ip | 890 M | 43,170,600 | 2.459 s | 99.568% | | conn_zorder | 890 M | 54,841,302 | 3.185 s | 99.451% | **10 billion data and 2000 files and Query resource:200 core 600G memory** | Table | Average File Size | Scan row count | Average query time | row count Skipping ratio | | ------------------- | ----------------- | -------------- | ------------------ | ------------------------ | | conn_random_parquet | 234.8 M | 10,000,000,000 | 27.031 s | 0.0% | | conn_zorder_only_ip | 173.9 M | 43,170,600 | 2.668 s | 99.568% | | conn_zorder | 174.0 M | 54,841,302 | 3.207 s | 99.451% | **1 billion data and 10000 files and Query resource:10 core 40G memory** | Table | Average File Size | Scan row count | Average query time | row count Skipping ratio | | ------------------- | ----------------- | -------------- | ------------------ | ------------------------ | | conn_random_parquet | 2.7 M | 1,000,000,000 | 76.772 s | 0.0% | | conn_zorder_only_ip | 2.1 M | 406,572 | 3.963 s | 99.959% | | conn_zorder | 2.2 M | 387,942 | 3.621s | 99.961% | Closes #1178 from hzxiongyinke/zorder_performance_test. Closes #939 369a9b41 [hzxiongyinke] remove set spark.sql.extensions=org.apache.kyuubi.sql.KyuubiSparkSQLExtension; 8c8ae458 [hzxiongyinke] add index z-order-benchmark 66bd20fd [hzxiongyinke] change tables to three scenarios cc80f4e7 [hzxiongyinke] add License 70c29daa [hzxiongyinke] z-order performance_test 6f1892be [hzxiongyinke] Merge pull request #1 from apache/master Lead-authored-by: hzxiongyinke <1062376716@qq.com> Co-authored-by: hzxiongyinke <75288351+hzxiongyinke@users.noreply.github.com> Signed-off-by: ulysses-you <ulyssesyou@apache.org>
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.. Licensed to the Apache Software Foundation (ASF) under one or more
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contributor license agreements. See the NOTICE file distributed with
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this work for additional information regarding copyright ownership.
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The ASF licenses this file to You under the Apache License, Version 2.0
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(the "License"); you may not use this file except in compliance with
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the License. You may obtain a copy of the License at
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.. http://www.apache.org/licenses/LICENSE-2.0
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.. Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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.. image:: ../imgs/kyuubi_logo.png
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:align: center
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SQL References
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==============
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This part describes the use of the SQL References in Kyuubi, including lists of the available extension, data types and functions for use in SQL commands.
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.. toctree::
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:maxdepth: 2
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:numbered: 3
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rules
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functions
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z-order-benchmark
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