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Reynold Xin 5aad4509c1 [SPARK-17273][SQL] Move expression optimizer rules into a separate file 
## What changes were proposed in this pull request?
As part of breaking Optimizer.scala apart, this patch moves various expression optimization rules into a single file.

## How was this patch tested?
This should be covered by existing tests.

Author: Reynold Xin <rxin@databricks.com>

Closes #14845 from rxin/SPARK-17273.
2016-08-27 00:34:35 -07:00
..
catalyst [SPARK-17273][SQL] Move expression optimizer rules into a separate file 2016-08-27 00:34:35 -07:00
core [SPARK-17235][SQL] Support purging of old logs in MetadataLog 2016-08-26 16:05:34 -07:00
hive [SPARK-17246][SQL] Add BigDecimal literal 2016-08-26 13:29:22 -07:00
hive-thriftserver [SPARK-17190][SQL] Removal of HiveSharedState 2016-08-25 12:50:03 +08:00
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.