PySpark 1.5 How to Truncate Timestamp to Nearest Minute from seconds

Question

I am using PySpark. I have a column ('dt') in a dataframe ('canon_evt') that this a timestamp. I am trying to remove seconds from a DateTime value. It is originally read in from parquet as a String. I then try to convert it to Timestamp via

canon_evt = canon_evt.withColumn('dt',to_date(canon_evt.dt))
canon_evt= canon_evt.withColumn('dt',canon_evt.dt.astype('Timestamp'))

Then I would like to remove the seconds. I tried 'trunc', 'date_format' or even trying to concatenate pieces together like below. I think it requires some sort of map and lambda combination, but I'm not certain whether Timestamp is an appropriate format, and whether it's possible to get rid of seconds.

canon_evt = canon_evt.withColumn('dyt',year('dt') + '-' + month('dt') +
    '-' + dayofmonth('dt') + ' ' + hour('dt') + ':' + minute('dt'))

[Row(dt=datetime.datetime(2015, 9, 16, 0, 0),dyt=None)]

Answer 1

Spark >= 2.3

You can use date_trunc

df.withColumn("dt_truncated", date_trunc("minute", col("dt"))).show()

## +-------------------+-------------------+
## |                 dt|       dt_truncated|
## +-------------------+-------------------+
## |1970-01-01 00:00:00|1970-01-01 00:00:00|
## |2015-09-16 05:39:46|2015-09-16 05:39:00|
## |2015-09-16 05:40:46|2015-09-16 05:40:00|
## |2016-03-05 02:00:10|2016-03-05 02:00:00|
## +-------------------+-------------------+

Spark < 2.3

Converting to Unix timestamps and basic arithmetics should to the trick:

from pyspark.sql import Row
from pyspark.sql.functions import col, unix_timestamp, round

df = sc.parallelize([
    Row(dt='1970-01-01 00:00:00'),
    Row(dt='2015-09-16 05:39:46'),
    Row(dt='2015-09-16 05:40:46'),
    Row(dt='2016-03-05 02:00:10'),
]).toDF()


## unix_timestamp converts string to Unix timestamp (bigint / long)
## in seconds. Divide by 60, round, multiply by 60 and cast
## should work just fine.
## 
dt_truncated = ((round(unix_timestamp(col("dt")) / 60) * 60)
    .cast("timestamp"))

df.withColumn("dt_truncated", dt_truncated).show(10, False)
## +-------------------+---------------------+
## |dt                 |dt_truncated         |
## +-------------------+---------------------+
## |1970-01-01 00:00:00|1970-01-01 00:00:00.0|
## |2015-09-16 05:39:46|2015-09-16 05:40:00.0|
## |2015-09-16 05:40:46|2015-09-16 05:41:00.0|
## |2016-03-05 02:00:10|2016-03-05 02:00:00.0|
## +-------------------+---------------------+

Answer 2

This question was asked a few years ago, but if anyone else comes across it, as of Spark v2.3 this has been added as a feature. Now this is as simple as (assumes canon_evt is a dataframe with timestamp column dt that we want to remove the seconds from)

from pyspark.sql.functions import date_trunc

canon_evt = canon_evt.withColumn('dt', date_trunc('minute', canon_evt.dt))