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Takeshi Yamamuro 8197ee3b15
[SPARK-33690][SQL] Escape meta-characters in showString 
### What changes were proposed in this pull request?

This PR intends to escape meta-characters (e.g., \n and \t) in `Dataset.showString`.
Before this PR:
```
scala> Seq("aaa\nbbb\t\tccccc").toDF("value").show()
+--------------+
|         value|
+--------------+
|aaa
bbb		ccccc|
+--------------+
```
After this PR:
```
+-----------------+
|            value|
+-----------------+
|aaa\nbbb\t\tccccc|
+-----------------+
```

### Why are the changes needed?

For better output.

### Does this PR introduce _any_ user-facing change?

No.

### How was this patch tested?

Added a unit test.

Closes #30647 from maropu/EscapeMetaInShow.

Authored-by: Takeshi Yamamuro <yamamuro@apache.org>
Signed-off-by: Dongjoon Hyun <dongjoon@apache.org>
2020-12-13 15:04:23 -08:00
..
catalyst [SPARK-33764][SS] Make state store maintenance interval as SQL config 2020-12-13 14:57:09 -08:00
core [SPARK-33690][SQL] Escape meta-characters in showString 2020-12-13 15:04:23 -08:00
hive [SPARK-33654][SQL] Migrate CACHE TABLE to use UnresolvedRelation to resolve identifier 2020-12-11 12:39:58 +00:00
hive-thriftserver [SPARK-33589][SQL][FOLLOWUP] Replace Throwable with NonFatal 2020-12-13 14:52:26 -08:00
create-docs.sh [SPARK-31550][SQL][DOCS] Set nondeterministic configurations with general meanings in sql configuration doc 2020-04-27 17:08:52 +09:00
gen-sql-api-docs.py [SPARK-31474][SQL][FOLLOWUP] Replace _FUNC_ placeholder with functionname in the note field of expression info 2020-04-23 13:33:04 +09:00
gen-sql-config-docs.py [SPARK-31550][SQL][DOCS] Set nondeterministic configurations with general meanings in sql configuration doc 2020-04-27 17:08:52 +09:00
gen-sql-functions-docs.py [SPARK-31562][SQL] Update ExpressionDescription for substring, current_date, and current_timestamp 2020-04-26 11:46:52 -07:00
mkdocs.yml [SPARK-30731] Update deprecated Mkdocs option 2020-02-19 17:28:58 +09:00
README.md [SPARK-30510][SQL][DOCS] Publicly document Spark SQL configuration options 2020-02-09 19:20:47 +09:00

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 extensions that allow 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, and SQL configuration documentation that gets included as part of configuration.md in the main docs directory.