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John Ayad f197204f03 [SPARK-30236][SQL][DOCS] Clarify date and time patterns supported in docs 
### What changes were proposed in this pull request?

Link to appropriate Java Class with list of date/time patterns supported

### Why are the changes needed?

Avoid confusion on the end-user's side of things, as seen in questions like [this](https://stackoverflow.com/questions/54496878/date-format-conversion-is-adding-1-year-to-the-border-dates) on StackOverflow

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

Yes, Docs are updated.

### How was this patch tested?

`date_format`:
![image](https://user-images.githubusercontent.com/2394761/70796647-b5c55900-1d9a-11ea-89f9-7a8661641c09.png)

`to_unix_timestamp`:
![image](https://user-images.githubusercontent.com/2394761/70796664-c07fee00-1d9a-11ea-9029-e82d899e3f59.png)

`unix_timestamp`:
![image](https://user-images.githubusercontent.com/2394761/70796688-caa1ec80-1d9a-11ea-8868-a18c437a5d49.png)

`from_unixtime`:
![image](https://user-images.githubusercontent.com/2394761/70796703-d4c3eb00-1d9a-11ea-85fe-3c672e0cda28.png)

`to_date`:
![image](https://user-images.githubusercontent.com/2394761/70796718-dd1c2600-1d9a-11ea-81f4-a0966eeb0f1d.png)

`to_timestamp`:
![image](https://user-images.githubusercontent.com/2394761/70796735-e6a58e00-1d9a-11ea-8ef7-d3e1d9b5370f.png)

Closes #26864 from johnhany97/SPARK-30236.

Authored-by: John Ayad <johnhany97@gmail.com>
Signed-off-by: Dongjoon Hyun <dhyun@apple.com>
2019-12-14 13:08:15 -08:00
..
catalyst [SPARK-30236][SQL][DOCS] Clarify date and time patterns supported in docs 2019-12-14 13:08:15 -08:00
core [SPARK-30143][SS] Add a timeout on stopping a streaming query 2019-12-13 15:16:00 -08:00
hive [SPARK-30238][SQL] hive partition pruning can only support string and integral types 2019-12-12 13:07:20 -08:00
hive-thriftserver [SPARK-30125][SQL] Remove PostgreSQL dialect 2019-12-11 01:22:34 +08:00
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-27328][SQL] Add 'deprecated' in ExpressionDescription for extended usage and SQL doc 2019-04-09 13:49:42 +08:00
mkdocs.yml [SPARK-21485][SQL][DOCS] Spark SQL documentation generation for built-in functions 2017-07-26 09:38:51 -07:00
README.md [SPARK-28980][CORE][SQL][STREAMING][MLLIB] Remove most items deprecated in Spark 2.2.0 or earlier, for Spark 3 2019-09-09 10:19:40 -05:00

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.