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Yuanjian Li 8616109061 [SPARK-9853][CORE][FOLLOW-UP] Regularize all the shuffle configurations related to adaptive execution 
### What changes were proposed in this pull request?
1. Regularize all the shuffle configurations related to adaptive execution.
2. Add default value for `BlockStoreShuffleReader.shouldBatchFetch`.

### Why are the changes needed?
It's a follow-up PR for #26040.
Regularize the existing `spark.sql.adaptive.shuffle` namespace in SQLConf.

### Does this PR introduce any user-facing change?
Rename one released user config `spark.sql.adaptive.minNumPostShufflePartitions` to `spark.sql.adaptive.shuffle.minNumPostShufflePartitions`, other changed configs is not released yet.

### How was this patch tested?
Existing UT.

Closes #26147 from xuanyuanking/SPARK-9853.

Authored-by: Yuanjian Li <xyliyuanjian@gmail.com>
Signed-off-by: Wenchen Fan <wenchen@databricks.com>
2019-10-18 15:39:35 +08:00
..
catalyst [SPARK-9853][CORE][FOLLOW-UP] Regularize all the shuffle configurations related to adaptive execution 2019-10-18 15:39:35 +08:00
core [MINOR][DOCS] Fix some typos 2019-10-17 07:22:01 -07:00
hive [MINOR][DOCS] Fix some typos 2019-10-17 07:22:01 -07:00
hive-thriftserver [SPARK-29283][SQL] Error message is hidden when query from JDBC, especially enabled adaptive execution 2019-10-16 19:51:56 -07:00
create-docs.sh
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.