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Kent Yao 88ae6c4481 [SPARK-31189][SQL][DOCS] Fix errors and missing parts for datetime pattern document 
### What changes were proposed in this pull request?

Fix errors and missing parts for datetime pattern document
1. The pattern we use is similar to DateTimeFormatter and SimpleDateFormat but not identical. So we shouldn't use any of them in the API docs but use a link to the doc of our own.
2. Some pattern letters are missing
3. Some pattern letters are explicitly banned - Set('A', 'c', 'e', 'n', 'N')
4. the second fraction pattern different logic for parsing and formatting

### Why are the changes needed?

fix and improve doc
### Does this PR introduce any user-facing change?

yes, new and updated doc
### How was this patch tested?

pass Jenkins
viewed locally with `jekyll serve`
![image](https://user-images.githubusercontent.com/8326978/77044447-6bd3bb00-69fa-11ea-8d6f-7084166c5dea.png)

Closes #27956 from yaooqinn/SPARK-31189.

Authored-by: Kent Yao <yaooqinn@hotmail.com>
Signed-off-by: Wenchen Fan <wenchen@databricks.com>
2020-03-20 21:59:26 +08:00
..
avro [SPARK-27506][SQL][FOLLOWUP] Use option avroSchema to specify an evolved schema in from_avro 2019-12-30 18:14:21 +09:00
pandas [SPARK-30812][SQL][CORE] Revise boolean config name to comply with new config naming policy 2020-02-18 20:39:50 +08:00
tests [SPARK-30569][SQL][PYSPARK][SPARKR] Add percentile_approx DSL functions 2020-03-17 10:44:21 +09:00
__init__.py [SPARK-30434][PYTHON][SQL] Move pandas related functionalities into 'pandas' sub-package 2020-01-09 10:22:50 +09:00
catalog.py [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
column.py [SPARK-30859][PYSPARK][DOCS][MINOR] Fixed docstring syntax issues preventing proper compilation of documentation 2020-02-18 16:46:45 +09:00
conf.py [SPARK-23698][PYTHON] Resolve undefined names in Python 3 2018-08-22 10:06:59 -07:00
context.py [SPARK-30856][SQL][PYSPARK] Fix SQLContext.getOrCreate() when SparkContext is restarted 2020-02-20 12:21:24 +09:00
dataframe.py [SPARK-30764][SQL] Improve the readability of EXPLAIN FORMATTED style 2020-02-21 23:36:14 +08:00
functions.py [SPARK-31189][SQL][DOCS] Fix errors and missing parts for datetime pattern document 2020-03-20 21:59:26 +08:00
group.py [SPARK-30434][PYTHON][SQL] Move pandas related functionalities into 'pandas' sub-package 2020-01-09 10:22:50 +09:00
readwriter.py [SPARK-31189][SQL][DOCS] Fix errors and missing parts for datetime pattern document 2020-03-20 21:59:26 +08:00
session.py [SPARK-30856][SQL][PYSPARK] Fix SQLContext.getOrCreate() when SparkContext is restarted 2020-02-20 12:21:24 +09:00
streaming.py [SPARK-31189][SQL][DOCS] Fix errors and missing parts for datetime pattern document 2020-03-20 21:59:26 +08:00
types.py [SPARK-30941][PYSPARK] Add a note to asDict to document its behavior when there are duplicate fields 2020-03-09 11:06:45 -07:00
udf.py [SPARK-30722][PYTHON][DOCS] Update documentation for Pandas UDF with Python type hints 2020-02-12 10:49:46 +09:00
utils.py [SPARK-30434][PYTHON][SQL] Move pandas related functionalities into 'pandas' sub-package 2020-01-09 10:22:50 +09:00
window.py [SPARK-30188][SQL] Resolve the failed unit tests when enable AQE 2020-01-13 22:55:19 +08:00