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lufei 846bc61cf5 [MINOR][SQL] The comment of Class ExchangeCoordinator exist a typing and context error 
## What changes were proposed in this pull request?

The given example in the comment of Class ExchangeCoordinator is exist four post-shuffle partitions,but the current comment is “three”.

## How was this patch tested?

Author: lufei <lu.fei80@zte.com.cn>

Closes #19028 from figo77/SPARK-21816.
2017-08-24 10:07:27 +01:00
..
catalyst [SPARK-21807][SQL] Override ++ operation in ExpressionSet to reduce clone time 2017-08-23 20:35:08 -07:00
core [MINOR][SQL] The comment of Class ExchangeCoordinator exist a typing and context error 2017-08-24 10:07:27 +01:00
hive [SPARK-21765] Set isStreaming on leaf nodes for streaming plans. 2017-08-22 19:07:43 -07:00
hive-thriftserver [SPARK-21428] Turn IsolatedClientLoader off while using builtin Hive jars for reusing CliSessionState 2017-08-18 00:24:45 +08:00
create-docs.sh [SPARK-21773][BUILD][DOCS] Installs mkdocs if missing in the path in SQL documentation build 2017-08-20 19:48:04 +09:00
gen-sql-markdown.py [SPARK-21485][FOLLOWUP][SQL][DOCS] Describes examples and arguments separately, and note/since in SQL built-in function documentation 2017-08-05 10:10:56 -07:00
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-21485][SQL][DOCS] Spark SQL documentation generation for built-in functions 2017-07-26 09:38:51 -07:00

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 an extension of SQLContext called HiveContext that allows users to write queries using a subset of HiveQL and access data from a Hive Metastore using Hive SerDes. There are also wrappers that allows 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.