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Max Gekk 1b60ff5afe [MINOR][DOCS] Document when current_date and current_timestamp are evaluated 
### What changes were proposed in this pull request?
Explicitly document that `current_date` and `current_timestamp` are executed at the start of query evaluation. And all calls of `current_date`/`current_timestamp` within the same query return the same value

### Why are the changes needed?
Users could expect that `current_date` and `current_timestamp` return the current date/timestamp at the moment of query execution but in fact the functions are folded by the optimizer at the start of query evaluation:
0df8dd6073/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/finishAnalysis.scala (L71-L91)

### Does this PR introduce _any_ user-facing change?
No

### How was this patch tested?
by running `./dev/scalastyle`.

Closes #29892 from MaxGekk/doc-current_date.

Authored-by: Max Gekk <max.gekk@gmail.com>
Signed-off-by: Wenchen Fan <wenchen@databricks.com>
2020-09-29 05:20:12 +00:00
..
cloudpickle [SPARK-32094][PYTHON] Update cloudpickle to v1.5.0 2020-07-17 11:49:18 +09:00
ml [SPARK-32714][PYTHON] Initial pyspark-stubs port 2020-09-24 14:15:36 +09:00
mllib [SPARK-32714][PYTHON] Initial pyspark-stubs port 2020-09-24 14:15:36 +09:00
resource [SPARK-32714][PYTHON] Initial pyspark-stubs port 2020-09-24 14:15:36 +09:00
sql [MINOR][DOCS] Document when current_date and current_timestamp are evaluated 2020-09-29 05:20:12 +00:00
streaming [SPARK-32714][PYTHON] Initial pyspark-stubs port 2020-09-24 14:15:36 +09:00
testing [SPARK-32714][PYTHON] Initial pyspark-stubs port 2020-09-24 14:15:36 +09:00
tests [SPARK-32714][FOLLOW-UP][PYTHON] Address pyspark.install typing errors 2020-09-27 16:21:23 +09:00
__init__.py [SPARK-32719][PYTHON] Add Flake8 check missing imports 2020-08-31 11:23:31 +09:00
__init__.pyi [SPARK-32714][PYTHON] Initial pyspark-stubs port 2020-09-24 14:15:36 +09:00
_globals.py [SPARK-23328][PYTHON] Disallow default value None in na.replace/replace when 'to_replace' is not a dictionary 2018-02-09 14:21:10 +08:00
_globals.pyi [SPARK-32714][PYTHON] Initial pyspark-stubs port 2020-09-24 14:15:36 +09:00
_typing.pyi [SPARK-32714][PYTHON] Initial pyspark-stubs port 2020-09-24 14:15:36 +09:00
accumulators.py [SPARK-32138] Drop Python 2.7, 3.4 and 3.5 2020-07-14 11:22:44 +09:00
accumulators.pyi [SPARK-32714][PYTHON] Initial pyspark-stubs port 2020-09-24 14:15:36 +09:00
broadcast.py [SPARK-32138] Drop Python 2.7, 3.4 and 3.5 2020-07-14 11:22:44 +09:00
broadcast.pyi [SPARK-32714][PYTHON] Initial pyspark-stubs port 2020-09-24 14:15:36 +09:00
conf.py [SPARK-32138] Drop Python 2.7, 3.4 and 3.5 2020-07-14 11:22:44 +09:00
conf.pyi [SPARK-32714][PYTHON] Initial pyspark-stubs port 2020-09-24 14:15:36 +09:00
context.py [SPARK-32160][CORE][PYSPARK][FOLLOWUP] Change the config name to switch allow/disallow SparkContext in executors 2020-08-04 12:45:06 +09:00
context.pyi [SPARK-32714][PYTHON] Initial pyspark-stubs port 2020-09-24 14:15:36 +09:00
daemon.py [SPARK-26175][PYTHON] Redirect the standard input of the forked child to devnull in daemon 2019-07-31 09:10:24 +09:00
daemon.pyi [SPARK-32714][PYTHON] Initial pyspark-stubs port 2020-09-24 14:15:36 +09:00
files.py [SPARK-28206][PYTHON] Remove the legacy Epydoc in PySpark API documentation 2019-07-05 10:08:22 -07:00
files.pyi [SPARK-32714][PYTHON] Initial pyspark-stubs port 2020-09-24 14:15:36 +09:00
find_spark_home.py [SPARK-32017][PYTHON][BUILD] Make Pyspark Hadoop 3.2+ Variant available in PyPI 2020-09-23 09:30:51 +09:00
find_spark_home.pyi [SPARK-32714][PYTHON] Initial pyspark-stubs port 2020-09-24 14:15:36 +09:00
install.py [SPARK-32714][FOLLOW-UP][PYTHON] Address pyspark.install typing errors 2020-09-27 16:21:23 +09:00
java_gateway.py [SPARK-32138] Drop Python 2.7, 3.4 and 3.5 2020-07-14 11:22:44 +09:00
java_gateway.pyi [SPARK-32714][PYTHON] Initial pyspark-stubs port 2020-09-24 14:15:36 +09:00
join.py [SPARK-14202] [PYTHON] Use generator expression instead of list comp in python_full_outer_jo… 2016-03-28 14:51:36 -07:00
join.pyi [SPARK-32714][PYTHON] Initial pyspark-stubs port 2020-09-24 14:15:36 +09:00
profiler.py [SPARK-26640][CORE][ML][SQL][STREAMING][PYSPARK] Code cleanup from lgtm.com analysis 2019-01-17 19:40:39 -06:00
profiler.pyi [SPARK-32714][PYTHON] Initial pyspark-stubs port 2020-09-24 14:15:36 +09:00
py.typed [SPARK-32714][PYTHON] Initial pyspark-stubs port 2020-09-24 14:15:36 +09:00
rdd.py [SPARK-32319][PYSPARK] Disallow the use of unused imports 2020-08-08 08:51:57 -07:00
rdd.pyi [SPARK-32714][PYTHON] Initial pyspark-stubs port 2020-09-24 14:15:36 +09:00
rddsampler.py [SPARK-4897] [PySpark] Python 3 support 2015-04-16 16:20:57 -07:00
rddsampler.pyi [SPARK-32714][PYTHON] Initial pyspark-stubs port 2020-09-24 14:15:36 +09:00
resultiterable.py [SPARK-32138] Drop Python 2.7, 3.4 and 3.5 2020-07-14 11:22:44 +09:00
resultiterable.pyi [SPARK-32714][PYTHON] Initial pyspark-stubs port 2020-09-24 14:15:36 +09:00
serializers.py [SPARK-32138] Drop Python 2.7, 3.4 and 3.5 2020-07-14 11:22:44 +09:00
serializers.pyi [SPARK-32714][PYTHON] Initial pyspark-stubs port 2020-09-24 14:15:36 +09:00
shell.py [SPARK-32138] Drop Python 2.7, 3.4 and 3.5 2020-07-14 11:22:44 +09:00
shell.pyi [SPARK-32714][PYTHON] Initial pyspark-stubs port 2020-09-24 14:15:36 +09:00
shuffle.py [SPARK-32435][PYTHON] Remove heapq3 port from Python 3 2020-07-27 20:10:13 +09:00
shuffle.pyi [SPARK-32714][PYTHON] Initial pyspark-stubs port 2020-09-24 14:15:36 +09:00
statcounter.py [SPARK-6919] [PYSPARK] Add asDict method to StatCounter 2015-09-29 13:38:15 -07:00
statcounter.pyi [SPARK-32714][PYTHON] Initial pyspark-stubs port 2020-09-24 14:15:36 +09:00
status.py [SPARK-4172] [PySpark] Progress API in Python 2015-02-17 13:36:43 -08:00
status.pyi [SPARK-32714][PYTHON] Initial pyspark-stubs port 2020-09-24 14:15:36 +09:00
storagelevel.py [SPARK-31448][PYTHON] Fix storage level used in persist() in dataframe.py 2020-09-15 08:41:22 -05:00
storagelevel.pyi [SPARK-32714][PYTHON] Initial pyspark-stubs port 2020-09-24 14:15:36 +09:00
taskcontext.py [SPARK-32138] Drop Python 2.7, 3.4 and 3.5 2020-07-14 11:22:44 +09:00
taskcontext.pyi [SPARK-32714][PYTHON] Initial pyspark-stubs port 2020-09-24 14:15:36 +09:00
traceback_utils.py [SPARK-1087] Move python traceback utilities into new traceback_utils.py file. 2014-09-15 19:28:17 -07:00
traceback_utils.pyi [SPARK-32714][PYTHON] Initial pyspark-stubs port 2020-09-24 14:15:36 +09:00
util.py [SPARK-32010][PYTHON][CORE] Add InheritableThread for local properties and fixing a thread leak issue in pinned thread mode 2020-07-30 10:15:25 +09:00
util.pyi [SPARK-32714][PYTHON] Initial pyspark-stubs port 2020-09-24 14:15:36 +09:00
version.py [SPARK-30950][BUILD] Setting version to 3.1.0-SNAPSHOT 2020-02-25 19:44:31 -08:00
version.pyi [SPARK-32714][PYTHON] Initial pyspark-stubs port 2020-09-24 14:15:36 +09:00
worker.py [MINOR][PYTHON] Fix spacing in error message 2020-07-28 11:22:18 +09:00
worker.pyi [SPARK-32714][PYTHON] Initial pyspark-stubs port 2020-09-24 14:15:36 +09:00