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michaelzhang-db ec91818e14 [SPARK-36105][SQL] OptimizeLocalShuffleReader support reading data of multiple mappers in one task 
### What changes were proposed in this pull request?
Added another partition spec to allow OptimizeLocalShuffleReader rule to read data from multiple mappers if the parallelism is less than the number of mappers.

### Why are the changes needed?
Optimization to the OptimizeLocalShuffleReader rule

### Does this PR introduce _any_ user-facing change?
No

### How was this patch tested?
Unit tests

Closes #33310 from michaelzhang-db/supportDataFromMultipleMappers.

Authored-by: michaelzhang-db <michael.zhang@databricks.com>
Signed-off-by: Wenchen Fan <wenchen@databricks.com>
(cherry picked from commit 094ae3708f)
Signed-off-by: Wenchen Fan <wenchen@databricks.com>
2021-07-26 17:57:15 +08:00
..
catalyst [SPARK-34952][SQL] DSv2 Aggregate push down APIs 2021-07-26 16:01:43 +08:00
core [SPARK-36105][SQL] OptimizeLocalShuffleReader support reading data of multiple mappers in one task 2021-07-26 17:57:15 +08:00
hive [SPARK-28266][SQL] convertToLogicalRelation should not interpret path property when reading Hive tables 2021-07-21 22:40:59 +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.