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Maryann Xue 6198f38405
[SPARK-31473][SQL] AQE should set active session during execution 
### What changes were proposed in this pull request?

AQE creates new SparkPlan nodes during execution. This PR makes sure that the active session is set correctly during this process and AQE execution is not disrupted by external session change.

### Why are the changes needed?

To prevent potential errors. If not changed, the physical plans generated by AQE would have the wrong SparkSession or even null SparkSession, which could lead to NPE.

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

No.

### How was this patch tested?

Added UT.

Closes #28247 from maryannxue/aqe-activesession.

Authored-by: Maryann Xue <maryann.xue@gmail.com>
Signed-off-by: Dongjoon Hyun <dongjoon@apache.org>
2020-04-18 00:08:36 -07:00
..
catalyst [SPARK-31468][SQL] Null types should be implicitly casted to Decimal types 2020-04-17 14:11:17 +00:00
core [SPARK-31473][SQL] AQE should set active session during execution 2020-04-18 00:08:36 -07:00
hive [SPARK-31425][SQL][CORE] UnsafeKVExternalSorter/VariableLengthRowBasedKeyValueBatch should also respect UnsafeAlignedOffset 2020-04-17 04:48:27 +00:00
hive-thriftserver [SPARK-31291][SQL][TEST][FOLLOWUP] Fix resource loading error in ThriftServerQueryTestSuite 2020-04-11 08:23:59 -07:00
create-docs.sh [SPARK-30510][SQL][DOCS] Publicly document Spark SQL configuration options 2020-02-09 19:20:47 +09:00
gen-sql-api-docs.py [SPARK-30510][SQL][DOCS] Publicly document Spark SQL configuration options 2020-02-09 19:20:47 +09:00
gen-sql-config-docs.py [SPARK-30840][CORE][SQL] Add version property for ConfigEntry and ConfigBuilder 2020-02-22 09:46:42 +09:00
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.