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HyukjinKwon 23b1312324 [SPARK-30200][DOCS][FOLLOW-UP] Add documentation for explain(mode: String) 
### What changes were proposed in this pull request?

This PR adds the documentation of the new `mode` added to `Dataset.explain`.

### Why are the changes needed?

To let users know the new modes.

### Does this PR introduce any user-facing change?

No (doc-only change).

### How was this patch tested?

Manually built the doc:
![Screen Shot 2019-12-16 at 3 34 28 PM](https://user-images.githubusercontent.com/6477701/70884617-d64f1680-2019-11ea-9336-247ade7f8768.png)

Closes #26903 from HyukjinKwon/SPARK-30200-doc.

Authored-by: HyukjinKwon <gurwls223@apache.org>
Signed-off-by: HyukjinKwon <gurwls223@apache.org>
2019-12-16 21:35:37 +09:00
..
catalyst [SPARK-30192][SQL] support column position in DS v2 2019-12-16 18:55:17 +08:00
core [SPARK-30200][DOCS][FOLLOW-UP] Add documentation for explain(mode: String) 2019-12-16 21:35:37 +09:00
hive [SPARK-30238][SQL] hive partition pruning can only support string and integral types 2019-12-12 13:07:20 -08:00
hive-thriftserver [SPARK-30125][SQL] Remove PostgreSQL dialect 2019-12-11 01:22:34 +08:00
create-docs.sh [MINOR][DOCS] Minor doc fixes related with doc build and uses script dir in SQL doc gen script 2017-08-26 13:56:24 +09:00
gen-sql-markdown.py [SPARK-27328][SQL] Add 'deprecated' in ExpressionDescription for extended usage and SQL doc 2019-04-09 13:49:42 +08:00
mkdocs.yml [SPARK-21485][SQL][DOCS] Spark SQL documentation generation for built-in functions 2017-07-26 09:38:51 -07:00
README.md [SPARK-28980][CORE][SQL][STREAMING][MLLIB] Remove most items deprecated in Spark 2.2.0 or earlier, for Spark 3 2019-09-09 10:19:40 -05:00

README.md

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.