56ae32657e
## What changes were proposed in this pull request? 1. create a new package for partitioning/distribution related classes. As Spark will add new concrete implementations of `Distribution` in new releases, it is good to have a new package for partitioning/distribution related classes. 2. move streaming related class to package `org.apache.spark.sql.sources.v2.reader/writer.streaming`, instead of `org.apache.spark.sql.sources.v2.streaming.reader/writer`. So that the there won't be package reader/writer inside package streaming, which is quite confusing. Before change: ``` v2 ├── reader ├── streaming │ ├── reader │ └── writer └── writer ``` After change: ``` v2 ├── reader │ └── streaming └── writer └── streaming ``` ## How was this patch tested? Unit test. Author: Wang Gengliang <ltnwgl@gmail.com> Closes #20435 from gengliangwang/new_pkg. |
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catalyst | ||
core | ||
hive | ||
hive-thriftserver | ||
create-docs.sh | ||
gen-sql-markdown.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 an extension of SQLContext called HiveContext that allows users to write queries using a subset of HiveQL and access data from a Hive Metastore using Hive SerDes. There are also wrappers that allows 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
.