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Wenchen Fan a025a89f4e [SPARK-32332][SQL] Support columnar exchanges 
### What changes were proposed in this pull request?

This PR adds abstract classes for shuffle and broadcast, so that users can provide their columnar implementations.

This PR updates several places to use the abstract exchange classes, and also update `AdaptiveSparkPlanExec` so that the columnar rules can see exchange nodes.

This is an alternative of https://github.com/apache/spark/pull/29134 .
Close https://github.com/apache/spark/pull/29134

### Why are the changes needed?

To allow columnar exchanges.

### Does this PR introduce _any_ user-facing change?

no

### How was this patch tested?

new tests

Closes #29262 from cloud-fan/columnar.

Authored-by: Wenchen Fan <wenchen@databricks.com>
Signed-off-by: Thomas Graves <tgraves@apache.org>
2020-07-29 14:21:47 -05:00
..
catalyst [SPARK-32346][SQL] Support filters pushdown in Avro datasource 2020-07-30 01:37:42 +08:00
core [SPARK-32332][SQL] Support columnar exchanges 2020-07-29 14:21:47 -05:00
hive [SPARK-32401][SQL] Migrate function related commands to use UnresolvedFunc to resolve function identifier 2020-07-29 03:55:48 +00:00
hive-thriftserver [SPARK-32426][SQL] ui shows sql after variable substitution 2020-07-25 03:30:01 -07:00
create-docs.sh [SPARK-31550][SQL][DOCS] Set nondeterministic configurations with general meanings in sql configuration doc 2020-04-27 17:08:52 +09:00
gen-sql-api-docs.py [SPARK-31474][SQL][FOLLOWUP] Replace _FUNC_ placeholder with functionname in the note field of expression info 2020-04-23 13:33:04 +09:00
gen-sql-config-docs.py [SPARK-31550][SQL][DOCS] Set nondeterministic configurations with general meanings in sql configuration doc 2020-04-27 17:08:52 +09:00
gen-sql-functions-docs.py [SPARK-31562][SQL] Update ExpressionDescription for substring, current_date, and current_timestamp 2020-04-26 11:46:52 -07:00
mkdocs.yml [SPARK-30731] Update deprecated Mkdocs option 2020-02-19 17:28:58 +09:00
README.md [SPARK-30510][SQL][DOCS] Publicly document Spark SQL configuration options 2020-02-09 19:20:47 +09:00

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, and SQL configuration documentation that gets included as part of configuration.md in the main docs directory.