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Terry Kim a927f1aefc [SPARK-29373][SQL] DataSourceV2: Commands should not submit a spark job 
### What changes were proposed in this pull request?
DataSourceV2 Exec classes (ShowTablesExec, ShowNamespacesExec, etc.) all extend LeafExecNode. This results in running a job when executeCollect() is called. This breaks the previous behavior [SPARK-19650](https://issues.apache.org/jira/browse/SPARK-19650).

A new command physical operator will be introduced form which all V2 Exec classes derive to avoid running a job.

### Why are the changes needed?

It is a bug since the current behavior runs a spark job, which breaks the existing behavior: [SPARK-19650](https://issues.apache.org/jira/browse/SPARK-19650).

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

No

### How was this patch tested?

Existing unit tests.

Closes #26048 from imback82/dsv2_command.

Authored-by: Terry Kim <yuminkim@gmail.com>
Signed-off-by: Wenchen Fan <wenchen@databricks.com>
2019-10-09 11:44:25 +08:00
..
catalyst [SPARK-29392][CORE][SQL][STREAMING] Remove symbol literal syntax 'foo, deprecated in Scala 2.13, in favor of Symbol("foo") 2019-10-08 20:15:37 -07:00
core [SPARK-29373][SQL] DataSourceV2: Commands should not submit a spark job 2019-10-09 11:44:25 +08:00
hive [SPARK-29392][CORE][SQL][STREAMING] Remove symbol literal syntax 'foo, deprecated in Scala 2.13, in favor of Symbol("foo") 2019-10-08 20:15:37 -07:00
hive-thriftserver [SPARK-29022][SQL] Fix SparkSQLCLI can not add jars by AddJarCommand 2019-10-01 10:09:29 -05:00
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
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.