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Reynold Xin 123b4fbbc3 [SPARK-20289][SQL] Use StaticInvoke to box primitive types 
## What changes were proposed in this pull request?
Dataset typed API currently uses NewInstance to box primitive types (i.e. calling the constructor). Instead, it'd be slightly more idiomatic in Java to use PrimitiveType.valueOf, which can be invoked using StaticInvoke expression.

## How was this patch tested?
The change should be covered by existing tests for Dataset encoders.

Author: Reynold Xin <rxin@databricks.com>

Closes #17604 from rxin/SPARK-20289.
2017-04-11 11:12:31 -07:00
..
catalyst [SPARK-20289][SQL] Use StaticInvoke to box primitive types 2017-04-11 11:12:31 -07:00
core [SPARK-20175][SQL] Exists should not be evaluated in Join operator 2017-04-11 20:33:10 +08:00
hive [SPARK-20156][CORE][SQL][STREAMING][MLLIB] Java String toLowerCase "Turkish locale bug" causes Spark problems 2017-04-10 20:11:56 +01:00
hive-thriftserver [SPARK-20156][CORE][SQL][STREAMING][MLLIB] Java String toLowerCase "Turkish locale bug" causes Spark problems 2017-04-10 20:11:56 +01:00
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.