jorisvandenbossche commented on code in PR #41593: URL: https://github.com/apache/arrow/pull/41593#discussion_r1637692450
########## docs/source/format/Intro.rst: ########## @@ -0,0 +1,458 @@ +.. 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. + +***************************************** +Introduction to the Arrow Columnar Format +***************************************** + +Apache Arrow was born with the idea to define a set of standards for +data representation and interchange between languages and systems to +avoid costs of data serialization/deserialization and in order to +avoid reinventing the wheel in each of those systems and languages. + +Each system or language requires their own format definitions, implementation +of common algorithms, etcetera. In our heterogeneous environments we +often have to move data from one system or language to accommodate our +workflows that meant copy and convert the data between them, which is +quite costly. + +Apart from this initial vision, Arrow has grown to also develop a +multi-language collection of libraries for solving problems related to +in-memory analytical data processing. This includes such topics as: + +* Zero-copy shared memory and RPC-based data movement +* Reading and writing file formats (like CSV, `Apache ORC`_, and `Apache Parquet`_) +* In-memory analytics and query processing + +.. _Apache ORC: https://orc.apache.org/ +.. _Apache Parquet: https://parquet.apache.org/ + +Arrow Columnar Format +===================== + +.. figure:: ./images/columnar-diagram_1.svg + :scale: 70% + :alt: Diagram with tabular data of 4 rows and columns. + +Data can be represented in memory using a row based format or a column Review Comment: > Perhaps a sub-section discussing row-by-row and column-by-column should be added before the "Arrow Columnar Format" section can focus solely on the columnar arrow format. +1 -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected]
