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Marco Gaido 3139d642fa [SPARK-23179][SQL] Support option to throw exception if overflow occurs during Decimal arithmetic 
## What changes were proposed in this pull request?

SQL ANSI 2011 states that in case of overflow during arithmetic operations, an exception should be thrown. This is what most of the SQL DBs do (eg. SQLServer, DB2). Hive currently returns NULL (as Spark does) but HIVE-18291 is open to be SQL compliant.

The PR introduce an option to decide which behavior Spark should follow, ie. returning NULL on overflow or throwing an exception.

## How was this patch tested?

added UTs

Closes #20350 from mgaido91/SPARK-23179.

Authored-by: Marco Gaido <marcogaido91@gmail.com>
Signed-off-by: Wenchen Fan <wenchen@databricks.com>
2019-06-27 19:02:07 +08:00
..
catalyst [SPARK-23179][SQL] Support option to throw exception if overflow occurs during Decimal arithmetic 2019-06-27 19:02:07 +08:00
core [SPARK-23179][SQL] Support option to throw exception if overflow occurs during Decimal arithmetic 2019-06-27 19:02:07 +08:00
hive [SPARK-28108][SQL][test-hadoop3.2] Simplify OrcFilters 2019-06-24 12:23:52 +08:00
hive-thriftserver [SPARK-28104][SQL] Implement Spark's own GetColumnsOperation 2019-06-22 09:15:07 -07:00
create-docs.sh
gen-sql-markdown.py [SPARK-27328][SQL] Add 'deprecated' in ExpressionDescription for extended usage and SQL doc 2019-04-09 13:49:42 +08:00
mkdocs.yml
README.md [MINOR][DOC] Fix some typos and grammar issues 2018-04-06 13:37:08 +08:00

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 allow 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.

Running sql/create-docs.sh generates SQL documentation for built-in functions under sql/site.