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maryannxue a7e3da42cd [SPARK-26840][SQL] Avoid cost-based join reorder in presence of join hints 
## What changes were proposed in this pull request?

This is a fix for https://github.com/apache/spark/pull/23524, which did not stop cost-based join reorder when the CostBasedJoinReorder rule recurses down the tree and applies join reorder for nested joins with hints.

The issue had not been detected by the existing tests because CBO is disabled by default.

## How was this patch tested?

Enabled CBO for JoinHintSuite.

Closes #23759 from maryannxue/spark-26840.

Lead-authored-by: maryannxue <maryannxue@apache.org>
Co-authored-by: Dongjoon Hyun <dhyun@apple.com>
Signed-off-by: gatorsmile <gatorsmile@gmail.com>
2019-02-14 16:56:55 -08:00
..
catalyst [SPARK-26840][SQL] Avoid cost-based join reorder in presence of join hints 2019-02-14 16:56:55 -08:00
core [SPARK-26840][SQL] Avoid cost-based join reorder in presence of join hints 2019-02-14 16:56:55 -08:00
hive [SPARK-26794][SQL] SparkSession enableHiveSupport does not point to hive but in-memory while the SparkContext exists 2019-02-14 15:07:22 +08:00
hive-thriftserver [SPARK-26817][CORE] Use System.nanoTime to measure time intervals 2019-02-13 13:12:16 -06:00
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.