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Burak Yavuz 6e27018157 [SPARK-18260] Make from_json null safe 
## What changes were proposed in this pull request?

`from_json` is currently not safe against `null` rows. This PR adds a fix and a regression test for it.

## How was this patch tested?

Regression test

Author: Burak Yavuz <brkyvz@gmail.com>

Closes #15771 from brkyvz/json_fix.
2016-11-05 00:07:51 -07:00
..
catalyst [SPARK-18260] Make from_json null safe 2016-11-05 00:07:51 -07:00
core [SPARK-18189] [SQL] [Followup] Move test from ReplSuite to prevent java.lang.ClassCircularityError 2016-11-04 23:34:29 -07:00
hive [SPARK-18167] Re-enable the non-flaky parts of SQLQuerySuite 2016-11-04 15:54:28 -07:00
hive-thriftserver [SPARK-17350][SQL] Disable default use of KryoSerializer in Thrift Server 2016-11-01 16:23:47 -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.