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Wenchen Fan ffb362a705 [SPARK-19712][SQL][FOLLOW-UP] reduce code duplication 
## What changes were proposed in this pull request?

abstract some common code into a method.

## How was this patch tested?

existing tests

Closes #24281 from cloud-fan/minor.

Authored-by: Wenchen Fan <wenchen@databricks.com>
Signed-off-by: Wenchen Fan <wenchen@databricks.com>
2019-04-04 00:37:57 +08:00
..
catalyst [SPARK-19712][SQL][FOLLOW-UP] reduce code duplication 2019-04-04 00:37:57 +08:00
core [MINOR][DOC][SQL] Remove out-of-date doc about ORC in DataFrameReader and Writer 2019-04-03 09:11:09 -07:00
hive [SPARK-27326][SQL] Fall back all v2 file sources in InsertIntoTable to V1 FileFormat 2019-03-30 14:38:26 -07:00
hive-thriftserver [SPARK-27323][CORE][SQL][STREAMING] Use Single-Abstract-Method support in Scala 2.12 to simplify code 2019-04-02 07:37:05 -07:00
create-docs.sh
gen-sql-markdown.py
mkdocs.yml
README.md [MINOR][DOC] Fix some typos and grammar issues 2018-04-06 13:37:08 +08:00

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 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 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.