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Jungtaek Lim (HeartSaVioR) f0bde69ebc [MINOR][SQL] Throw better exception for Encoder with tuple more than 22 elements 
## What changes were proposed in this pull request?

This patch proposes to throw better exception with better error message when encoding to tuple which elements are more than 22.

**BEFORE**
```scala
scala> import org.apache.spark.sql.catalyst.encoders._
scala> val encoders = (0 to 22).map(_ => org.apache.spark.sql.Encoders.scalaInt.asInstanceOf[ExpressionEncoder[_]])
scala> ExpressionEncoder.tuple(encoders)
java.lang.ClassNotFoundException: scala.Tuple23
```

**AFTER**
```scala
scala> ExpressionEncoder.tuple(encoders)
java.lang.UnsupportedOperationException: Due to Scala's limited support of tuple, tuple with more than 22 elements are not supported.
```

## How was this patch tested?

Added UT.

Closes #24046 from HeartSaVioR/MINOR-throw-better-exception-for-tuple-more-than-22.

Authored-by: Jungtaek Lim (HeartSaVioR) <kabhwan@gmail.com>
Signed-off-by: Takeshi Yamamuro <yamamuro@apache.org>
2019-03-11 13:44:45 +09:00
..
catalyst [MINOR][SQL] Throw better exception for Encoder with tuple more than 22 elements 2019-03-11 13:44:45 +09:00
core [SPARK-27110][SQL] Moves some functions from AnalyzeColumnCommand to command/CommandUtils 2019-03-10 15:17:46 -07:00
hive [SPARK-27118][SQL] Upgrade Hive Metastore Client to the latest versions for Hive 1.0.x/1.1.x 2019-03-09 16:50:10 -08:00
hive-thriftserver [SPARK-15095][FOLLOW-UP][SQL] Remove HiveSessionHook related code from ThriftServer 2019-03-05 07:42:25 -06:00
create-docs.sh [MINOR][DOCS] Minor doc fixes related with doc build and uses script dir in SQL doc gen script 2017-08-26 13:56:24 +09:00
gen-sql-markdown.py [SPARK-21485][FOLLOWUP][SQL][DOCS] Describes examples and arguments separately, and note/since in SQL built-in function documentation 2017-08-05 10:10:56 -07:00
mkdocs.yml [SPARK-21485][SQL][DOCS] Spark SQL documentation generation for built-in functions 2017-07-26 09:38:51 -07:00
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.