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Maryann Xue 90302309a3 [SPARK-31865][SQL] Fix complex AQE query stage not reused 
### What changes were proposed in this pull request?

This PR fixes the issue of complex query stages that contain sub stages not being reused at times due to dynamic plan changes. This PR synchronizes the "finished" flag between all reused stages so that the runtime replanning would always produce the same sub plan for their potentially reusable parent stages.

### Why are the changes needed?

Without this change, complex query stages that contain sub stages will sometimes not be reused due to dynamic plan changes and the status of their child query stages not being synced.

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

No.

### How was this patch tested?

Manually tested TPC-DS q47 and q57. Before this PR, the reuse of the biggest stage would happen with a 50/50 chance; and after this PR, it will happen 100% of the time.

Closes #28670 from maryannxue/fix-aqe-reuse.

Authored-by: Maryann Xue <maryann.xue@gmail.com>
Signed-off-by: Wenchen Fan <wenchen@databricks.com>
2020-05-29 04:20:22 +00:00
..
catalyst [SPARK-31839][TESTS] Delete duplicate code in castsuit 2020-05-28 09:57:11 +09:00
core [SPARK-31865][SQL] Fix complex AQE query stage not reused 2020-05-29 04:20:22 +00:00
hive [SPARK-31684][SQL] Overwrite partition failed with 'WRONG FS' when the target partition is not belong to the filesystem as same as the table 2020-05-19 14:08:51 +00:00
hive-thriftserver [SPARK-31833][SQL][TEST-HIVE1.2] Set HiveThriftServer2 with actual port while configured 0 2020-05-29 04:13:23 +00:00
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.