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Shixiong Zhu c26f673252 [SPARK-24246][SQL] Improve AnalysisException by setting the cause when it's available 
## What changes were proposed in this pull request?

If there is an exception, it's better to set it as the cause of AnalysisException since the exception may contain useful debug information.

## How was this patch tested?

Jenkins

Author: Shixiong Zhu <zsxwing@gmail.com>

Closes #21297 from zsxwing/SPARK-24246.
2018-05-14 11:37:57 -07:00
..
catalyst [SPARK-24246][SQL] Improve AnalysisException by setting the cause when it's available 2018-05-14 11:37:57 -07:00
core [SPARK-24246][SQL] Improve AnalysisException by setting the cause when it's available 2018-05-14 11:37:57 -07:00
hive [SPARK-22279][SQL] Enable convertMetastoreOrc by default 2018-05-10 13:36:52 +08:00
hive-thriftserver [SPARK-24017][SQL] Refactor ExternalCatalog to be an interface 2018-05-06 20:41:32 -07:00
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-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 [MINOR][DOC] Fix some typos and grammar issues 2018-04-06 13:37:08 +08:00

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 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.