| lead {SparkR} | R Documentation |
Window function: returns the value that is offset rows after the current row, and
defaultValue if there is less than offset rows after the current row.
For example, an offset of one will return the next row at any given point
in the window partition.
## S4 method for signature 'characterOrColumn,numeric' lead(x, offset = 1, defaultValue = NULL) lead(x, offset, defaultValue = NULL)
x |
the column as a character string or a Column to compute on. |
offset |
the number of rows after the current row from which to obtain a value. If not specified, the default is 1. |
defaultValue |
(optional) default to use when the offset row does not exist. |
This is equivalent to the LEAD function in SQL.
lead since 1.6.0
Other window_funcs: cume_dist,
cume_dist,
cume_dist,missing-method;
dense_rank, dense_rank,
dense_rank,missing-method;
lag, lag,
lag,characterOrColumn-method;
ntile, ntile,
ntile,numeric-method;
percent_rank, percent_rank,
percent_rank,missing-method;
rank, rank,
rank, rank,ANY-method,
rank,missing-method;
row_number, row_number,
row_number,missing-method
## Not run:
##D df <- createDataFrame(mtcars)
##D
##D # Partition by am (transmission) and order by hp (horsepower)
##D ws <- orderBy(windowPartitionBy("am"), "hp")
##D
##D # Lead mpg values by 1 row on the partition-and-ordered table
##D out <- select(df, over(lead(df$mpg), ws), df$mpg, df$hp, df$am)
## End(Not run)