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### What changes were proposed in this pull request? This PR adds a doc builder for Spark SQL's configuration options. Here's what the new Spark SQL config docs look like ([configuration.html.zip](https://github.com/apache/spark/files/4172109/configuration.html.zip)): ![Screen Shot 2020-02-07 at 12 13 23 PM](https://user-images.githubusercontent.com/1039369/74050007-425b5480-49a3-11ea-818c-42700c54d1fb.png) Compare this to the [current docs](http://spark.apache.org/docs/3.0.0-preview2/configuration.html#spark-sql): ![Screen Shot 2020-02-04 at 4 55 10 PM](https://user-images.githubusercontent.com/1039369/73790828-24a5a980-476f-11ea-998c-12cd613883e8.png) ### Why are the changes needed? There is no visibility into the various Spark SQL configs on [the config docs page](http://spark.apache.org/docs/3.0.0-preview2/configuration.html#spark-sql). ### Does this PR introduce any user-facing change? No, apart from new documentation. ### How was this patch tested? I tested this manually by building the docs and reviewing them in my browser. Closes #27459 from nchammas/SPARK-30510-spark-sql-options. Authored-by: Nicholas Chammas <nicholas.chammas@liveramp.com> Signed-off-by: HyukjinKwon <gurwls223@apache.org>
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Spark SQL
This module provides support for executing relational queries expressed in either SQL or the DataFrame/Dataset API.
Spark SQL is broken up into four subprojects:
- Catalyst (sql/catalyst) - An implementation-agnostic framework for manipulating trees of relational operators and expressions.
- Execution (sql/core) - A query planner / execution engine for translating Catalyst's logical query plans into Spark RDDs. This component also includes a new public interface, SQLContext, that allows users to execute SQL or LINQ statements against existing RDDs and Parquet files.
- Hive Support (sql/hive) - Includes extensions that allow users to write queries using a subset of HiveQL and access data from a Hive Metastore using Hive SerDes. There are also wrappers that allow users to run queries that include Hive UDFs, UDAFs, and UDTFs.
- HiveServer and CLI support (sql/hive-thriftserver) - Includes support for the SQL CLI (bin/spark-sql) and a HiveServer2 (for JDBC/ODBC) compatible server.
Running ./sql/create-docs.sh
generates SQL documentation for built-in functions under sql/site
, and SQL configuration documentation that gets included as part of configuration.md
in the main docs
directory.