diff options
-rw-r--r-- | R/pkg/R/functions.R | 8 | ||||
-rw-r--r-- | sql/core/src/main/scala/org/apache/spark/sql/functions.scala | 15 |
2 files changed, 17 insertions, 6 deletions
diff --git a/R/pkg/R/functions.R b/R/pkg/R/functions.R index ceedbe7671..4d94b4cd05 100644 --- a/R/pkg/R/functions.R +++ b/R/pkg/R/functions.R @@ -2713,11 +2713,15 @@ setMethod("from_unixtime", signature(x = "Column"), #' @param x a time Column. Must be of TimestampType. #' @param windowDuration a string specifying the width of the window, e.g. '1 second', #' '1 day 12 hours', '2 minutes'. Valid interval strings are 'week', -#' 'day', 'hour', 'minute', 'second', 'millisecond', 'microsecond'. +#' 'day', 'hour', 'minute', 'second', 'millisecond', 'microsecond'. Note that +#' the duration is a fixed length of time, and does not vary over time +#' according to a calendar. For example, '1 day' always means 86,400,000 +#' milliseconds, not a calendar day. #' @param slideDuration a string specifying the sliding interval of the window. Same format as #' \code{windowDuration}. A new window will be generated every #' \code{slideDuration}. Must be less than or equal to -#' the \code{windowDuration}. +#' the \code{windowDuration}. This duration is likewise absolute, and does not +#' vary according to a calendar. #' @param startTime the offset with respect to 1970-01-01 00:00:00 UTC with which to start #' window intervals. For example, in order to have hourly tumbling windows #' that start 15 minutes past the hour, e.g. 12:15-13:15, 13:15-14:15... provide diff --git a/sql/core/src/main/scala/org/apache/spark/sql/functions.scala b/sql/core/src/main/scala/org/apache/spark/sql/functions.scala index 18e736ab69..960c87f60e 100644 --- a/sql/core/src/main/scala/org/apache/spark/sql/functions.scala +++ b/sql/core/src/main/scala/org/apache/spark/sql/functions.scala @@ -2606,12 +2606,15 @@ object functions { * The time column must be of TimestampType. * @param windowDuration A string specifying the width of the window, e.g. `10 minutes`, * `1 second`. Check [[org.apache.spark.unsafe.types.CalendarInterval]] for - * valid duration identifiers. + * valid duration identifiers. Note that the duration is a fixed length of + * time, and does not vary over time according to a calendar. For example, + * `1 day` always means 86,400,000 milliseconds, not a calendar day. * @param slideDuration A string specifying the sliding interval of the window, e.g. `1 minute`. * A new window will be generated every `slideDuration`. Must be less than * or equal to the `windowDuration`. Check * [[org.apache.spark.unsafe.types.CalendarInterval]] for valid duration - * identifiers. + * identifiers. This duration is likewise absolute, and does not vary + * according to a calendar. * @param startTime The offset with respect to 1970-01-01 00:00:00 UTC with which to start * window intervals. For example, in order to have hourly tumbling windows that * start 15 minutes past the hour, e.g. 12:15-13:15, 13:15-14:15... provide @@ -2660,11 +2663,15 @@ object functions { * The time column must be of TimestampType. * @param windowDuration A string specifying the width of the window, e.g. `10 minutes`, * `1 second`. Check [[org.apache.spark.unsafe.types.CalendarInterval]] for - * valid duration identifiers. + * valid duration identifiers. Note that the duration is a fixed length of + * time, and does not vary over time according to a calendar. For example, + * `1 day` always means 86,400,000 milliseconds, not a calendar day. * @param slideDuration A string specifying the sliding interval of the window, e.g. `1 minute`. * A new window will be generated every `slideDuration`. Must be less than * or equal to the `windowDuration`. Check - * [[org.apache.spark.unsafe.types.CalendarInterval]] for valid duration. + * [[org.apache.spark.unsafe.types.CalendarInterval]] for valid duration + * identifiers. This duration is likewise absolute, and does not vary + * according to a calendar. * * @group datetime_funcs * @since 2.0.0 |