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Jacek Laskowski 500436b436 [MINOR][SQL][DOCS] Improve unix_timestamp's scaladoc (and typo hunting) 
## What changes were proposed in this pull request?

* Docs are consistent (across different `unix_timestamp` variants and their internal expressions)
* typo hunting

## How was this patch tested?

local build

Author: Jacek Laskowski <jacek@japila.pl>

Closes #17801 from jaceklaskowski/unix_timestamp.
2017-05-07 13:56:13 -07:00
..
catalyst [MINOR][SQL][DOCS] Improve unix_timestamp's scaladoc (and typo hunting) 2017-05-07 13:56:13 -07:00
core [MINOR][SQL][DOCS] Improve unix_timestamp's scaladoc (and typo hunting) 2017-05-07 13:56:13 -07:00
hive [SPARK-20523][BUILD] Clean up build warnings for 2.2.0 release 2017-05-03 10:18:35 +01:00
hive-thriftserver [SPARK-20453] Bump master branch version to 2.3.0-SNAPSHOT 2017-04-24 21:48:04 -07:00
README.md [SPARK-16557][SQL] Remove stale doc in sql/README.md 2016-07-14 19:24:42 -07:00

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 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.