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hyukjinkwon aeb45df668 [SPARK-22844][R] Adds date_trunc in R API 
## What changes were proposed in this pull request?

This PR adds `date_trunc` in R API as below:

```r
> df <- createDataFrame(list(list(a = as.POSIXlt("2012-12-13 12:34:00"))))
> head(select(df, date_trunc("hour", df$a)))
  date_trunc(hour, a)
1 2012-12-13 12:00:00
```

## How was this patch tested?

Unit tests added in `R/pkg/tests/fulltests/test_sparkSQL.R`.

Author: hyukjinkwon <gurwls223@gmail.com>

Closes #20031 from HyukjinKwon/r-datetrunc.
2017-12-24 01:18:11 +09:00
..
jarTest.R [SPARK-20877][SPARKR] refactor tests to basic tests only for CRAN 2017-06-11 00:00:33 -07:00
packageInAJarTest.R [SPARK-20877][SPARKR] refactor tests to basic tests only for CRAN 2017-06-11 00:00:33 -07:00
test_binary_function.R [SPARK-22063][R] Fixes lint check failures in R by latest commit sha1 ID of lint-r 2017-10-01 18:42:45 +09:00
test_binaryFile.R [SPARK-20877][SPARKR][FOLLOWUP] clean up after test move 2017-06-11 03:00:44 -07:00
test_broadcast.R [SPARK-20877][SPARKR][FOLLOWUP] clean up after test move 2017-06-11 03:00:44 -07:00
test_client.R [SPARK-19810][BUILD][CORE] Remove support for Scala 2.10 2017-07-13 17:06:24 +08:00
test_context.R [SPARK-21149][R] Add job description API for R 2017-06-23 09:59:24 -07:00
test_includePackage.R [SPARK-20877][SPARKR][FOLLOWUP] clean up after test move 2017-06-11 03:00:44 -07:00
test_jvm_api.R [SPARK-20877][SPARKR] refactor tests to basic tests only for CRAN 2017-06-11 00:00:33 -07:00
test_mllib_classification.R [SPARK-21693][R][ML] Reduce max iterations in Linear SVM test in R to speed up AppVeyor build 2017-11-12 14:37:20 -08:00
test_mllib_clustering.R [SPARK-20877][SPARKR][FOLLOWUP] clean up after test move 2017-06-11 03:00:44 -07:00
test_mllib_fpm.R [SPARK-20877][SPARKR][FOLLOWUP] clean up after test move 2017-06-11 03:00:44 -07:00
test_mllib_recommendation.R [SPARK-20877][SPARKR][FOLLOWUP] clean up after test move 2017-06-11 03:00:44 -07:00
test_mllib_regression.R [SPARK-21622][ML][SPARKR] Support offset in SparkR GLM 2017-08-06 15:14:12 -07:00
test_mllib_stat.R [SPARK-20877][SPARKR] refactor tests to basic tests only for CRAN 2017-06-11 00:00:33 -07:00
test_mllib_tree.R [SPARK-21801][SPARKR][TEST] unit test randomly fail with randomforest 2017-08-29 10:09:41 -07:00
test_parallelize_collect.R [SPARK-20877][SPARKR][FOLLOWUP] clean up after test move 2017-06-11 03:00:44 -07:00
test_rdd.R [SPARK-22063][R] Fixes lint check failures in R by latest commit sha1 ID of lint-r 2017-10-01 18:42:45 +09:00
test_Serde.R [SPARK-20877][SPARKR][FOLLOWUP] clean up after test move 2017-06-11 03:00:44 -07:00
test_shuffle.R [SPARK-20877][SPARKR][FOLLOWUP] clean up after test move 2017-06-11 03:00:44 -07:00
test_sparkR.R [SPARK-20877][SPARKR][FOLLOWUP] clean up after test move 2017-06-11 03:00:44 -07:00
test_sparkSQL.R [SPARK-22844][R] Adds date_trunc in R API 2017-12-24 01:18:11 +09:00
test_streaming.R [SPARK-21224][R] Specify a schema by using a DDL-formatted string when reading in R 2017-06-28 19:36:00 -07:00
test_take.R [SPARK-20877][SPARKR][FOLLOWUP] clean up after test move 2017-06-11 03:00:44 -07:00
test_textFile.R [SPARK-20877][SPARKR][FOLLOWUP] clean up after test move 2017-06-11 03:00:44 -07:00
test_utils.R [SPARK-22344][SPARKR] clean up install dir if running test as source package 2017-11-10 10:22:42 -08:00
test_Windows.R [SPARK-20877][SPARKR][FOLLOWUP] clean up after test move 2017-06-11 03:00:44 -07:00