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setjet 2dbe0c5288 [SPARK-20775][SQL] Added scala support from_json 
## What changes were proposed in this pull request?

from_json function required to take in a java.util.Hashmap. For other functions, a java wrapper is provided which casts a java hashmap to a scala map. Only a java function is provided in this case, forcing scala users to pass in a java.util.Hashmap.

Added the missing wrapper.

## How was this patch tested?
Added a unit test for passing in a scala map

Author: setjet <rubenljanssen@gmail.com>

Closes #18094 from setjet/spark-20775.
2017-05-26 10:21:39 +08:00
..
catalyst [SPARK-20403][SQL] Modify the instructions of some functions 2017-05-24 17:32:02 -07:00
core [SPARK-20775][SQL] Added scala support from_json 2017-05-26 10:21:39 +08:00
hive [SPARK-19707][SPARK-18922][TESTS][SQL][CORE] Fix test failures/the invalid path check for sc.addJar on Windows 2017-05-25 17:10:30 +01:00
hive-thriftserver [SPARK-20393][WEBU UI] Strengthen Spark to prevent XSS vulnerabilities 2017-05-10 10:59:57 +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.