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jiake 1ced6c1544 [SPARK-30213][SQL] Remove the mutable status in ShuffleQueryStageExec 
### What changes were proposed in this pull request?
Currently `ShuffleQueryStageExec `contain the mutable status, eg `mapOutputStatisticsFuture `variable. So It is not easy to pass when we copy `ShuffleQueryStageExec`. This PR will put the `mapOutputStatisticsFuture ` variable from `ShuffleQueryStageExec` to `ShuffleExchangeExec`. And then we can pass the value of `mapOutputStatisticsFuture ` when copying.

### Why are the changes needed?
In order to remove the mutable status in `ShuffleQueryStageExec`

### Does this PR introduce any user-facing change?
No

### How was this patch tested?
Existing uts

Closes #26846 from JkSelf/removeMutableVariable.

Authored-by: jiake <ke.a.jia@intel.com>
Signed-off-by: Dongjoon Hyun <dhyun@apple.com>
2019-12-11 19:39:31 -08:00
..
catalyst [SPARK-30038][SQL] DESCRIBE FUNCTION should do multi-catalog resolution 2019-12-11 14:02:58 -08:00
core [SPARK-30213][SQL] Remove the mutable status in ShuffleQueryStageExec 2019-12-11 19:39:31 -08:00
hive [SPARK-30038][SQL] DESCRIBE FUNCTION should do multi-catalog resolution 2019-12-11 14:02:58 -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.