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Wenchen Fan f4291e373e [SPARK-36228][SQL] Skip splitting a skewed partition when some map outputs are removed 
### What changes were proposed in this pull request?

Sometimes, AQE skew join optimization can fail with NPE. This is because AQE tries to get the shuffle block sizes, but some map outputs are missing due to the executor lost or something.

This PR fixes this bug by skipping skew join handling if some map outputs are missing in the `MapOutputTracker`.

### Why are the changes needed?

bug fix

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

no

### How was this patch tested?

a new UT

Closes #33445 from cloud-fan/bug.

Authored-by: Wenchen Fan <wenchen@databricks.com>
Signed-off-by: Wenchen Fan <wenchen@databricks.com>
(cherry picked from commit 9c8a3d3975)
Signed-off-by: Wenchen Fan <wenchen@databricks.com>
2021-07-21 22:18:14 +08:00
..
catalyst [SPARK-36132][SS][SQL] Support initial state for batch mode of flatMapGroupsWithState 2021-07-21 01:51:01 -04:00
core [SPARK-36228][SQL] Skip splitting a skewed partition when some map outputs are removed 2021-07-21 22:18:14 +08:00
hive [SPARK-36201][SQL][FOLLOWUP] Schema check should check inner field too 2021-07-20 21:08:36 +08:00
hive-thriftserver [SPARK-36179][SQL] Support TimestampNTZType in SparkGetColumnsOperation 2021-07-20 09:49:25 +09:00
create-docs.sh [SPARK-34010][SQL][DODCS] Use python3 instead of python in SQL documentation build 2021-01-05 19:48:10 +09:00
gen-sql-api-docs.py [SPARK-34747][SQL][DOCS] Add virtual operators to the built-in function document 2021-03-19 10:19:26 +09:00
gen-sql-config-docs.py [SPARK-32194][PYTHON] Use proper exception classes instead of plain Exception 2021-05-26 11:54:40 +09:00
gen-sql-functions-docs.py
mkdocs.yml
README.md

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.