6e1aa15679
### What changes were proposed in this pull request? It seems like spark inner join is performing a cartesian join in self joining using `joinWith` To produce this issues: ``` val df = spark.range(0,3) df.joinWith(df, df("id") === df("id")).show() ``` Before this pull request, the result is +---+---+ | _1 | _2 | +---+---+ | 0 | 0 | | 0 | 1 | | 0 | 2 | | 1 | 0 | | 1 | 1 | | 1 | 2 | | 2 | 0 | | 2 | 1 | | 2 | 2 | +---+---+ The expected result is +---+---+ | _1 | _2 | +---+---+ | 0 | 0 | | 1 | 1 | | 2 | 2 | +---+---+ ### Why are the changes needed? correctness ### Does this PR introduce _any_ user-facing change? no ### How was this patch tested? add test Closes #32863 from dgd-contributor/SPARK-35652_join_and_joinWith_in_seft_joining. Authored-by: dgd-contributor <dgd_contributor@viettel.com.vn> Signed-off-by: Wenchen Fan <wenchen@databricks.com> |
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.. | ||
catalyst | ||
core | ||
hive | ||
hive-thriftserver | ||
create-docs.sh | ||
gen-sql-api-docs.py | ||
gen-sql-config-docs.py | ||
gen-sql-functions-docs.py | ||
mkdocs.yml | ||
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.