| column_aggregate_functions {SparkR} | R Documentation |
Aggregate functions defined for Column.
approx_count_distinct(x, ...) approxCountDistinct(x, ...) collect_list(x) collect_set(x) countDistinct(x, ...) grouping_bit(x) grouping_id(x, ...) kurtosis(x) n_distinct(x, ...) percentile_approx(x, percentage, ...) sd(x, na.rm = FALSE) skewness(x) stddev(x) stddev_pop(x) stddev_samp(x) sumDistinct(x) var(x, y = NULL, na.rm = FALSE, use) variance(x) var_pop(x) var_samp(x) ## S4 method for signature 'Column' approx_count_distinct(x, rsd = 0.05) ## S4 method for signature 'Column' approxCountDistinct(x, rsd = 0.05) ## S4 method for signature 'Column' kurtosis(x) ## S4 method for signature 'Column' max(x) ## S4 method for signature 'Column' mean(x) ## S4 method for signature 'Column' min(x) ## S4 method for signature 'characterOrColumn,numericOrColumn' percentile_approx(x, percentage, accuracy = 10000) ## S4 method for signature 'Column' sd(x) ## S4 method for signature 'Column' skewness(x) ## S4 method for signature 'Column' stddev(x) ## S4 method for signature 'Column' stddev_pop(x) ## S4 method for signature 'Column' stddev_samp(x) ## S4 method for signature 'Column' sum(x) ## S4 method for signature 'Column' sumDistinct(x) ## S4 method for signature 'Column' var(x) ## S4 method for signature 'Column' variance(x) ## S4 method for signature 'Column' var_pop(x) ## S4 method for signature 'Column' var_samp(x) ## S4 method for signature 'Column' approx_count_distinct(x, rsd = 0.05) ## S4 method for signature 'Column' approxCountDistinct(x, rsd = 0.05) ## S4 method for signature 'Column' countDistinct(x, ...) ## S4 method for signature 'Column' n_distinct(x, ...) ## S4 method for signature 'Column' collect_list(x) ## S4 method for signature 'Column' collect_set(x) ## S4 method for signature 'Column' grouping_bit(x) ## S4 method for signature 'Column' grouping_id(x, ...)
x |
Column to compute on. |
... |
additional argument(s). For example, it could be used to pass additional Columns. |
percentage |
Numeric percentage at which percentile should be computed All values should be between 0 and 1. If length equals to 1 resulting column is of type double, otherwise, array type of double. |
y, na.rm, use |
currently not used. |
rsd |
maximum relative standard deviation allowed (default = 0.05). |
accuracy |
A positive numeric literal (default: 10000) which controls approximation accuracy at the cost of memory. Higher value of accuracy yields better accuracy, 1.0/accuracy is the relative error of the approximation. |
approx_count_distinct: Returns the approximate number of distinct items in a group.
approxCountDistinct: Returns the approximate number of distinct items in a group.
kurtosis: Returns the kurtosis of the values in a group.
max: Returns the maximum value of the expression in a group.
mean: Returns the average of the values in a group. Alias for avg.
min: Returns the minimum value of the expression in a group.
percentile_approx Returns the approximate percentile of the numeric column
col which is the smallest value in the ordered col values (sorted from least to
greatest) such that no more than percentage of col values is less than the value
or equal to that value.
sd: Alias for stddev_samp.
skewness: Returns the skewness of the values in a group.
stddev: Alias for std_dev.
stddev_pop: Returns the population standard deviation of the expression in a group.
stddev_samp: Returns the unbiased sample standard deviation of the expression in a group.
sum: Returns the sum of all values in the expression.
sumDistinct: Returns the sum of distinct values in the expression.
var: Alias for var_samp.
var_pop: Returns the population variance of the values in a group.
var_samp: Returns the unbiased variance of the values in a group.
countDistinct: Returns the number of distinct items in a group.
n_distinct: Returns the number of distinct items in a group.
collect_list: Creates a list of objects with duplicates.
Note: the function is non-deterministic because the order of collected results depends
on the order of the rows which may be non-deterministic after a shuffle.
collect_set: Creates a list of objects with duplicate elements eliminated.
Note: the function is non-deterministic because the order of collected results depends
on the order of the rows which may be non-deterministic after a shuffle.
grouping_bit: Indicates whether a specified column in a GROUP BY list is aggregated or
not, returns 1 for aggregated or 0 for not aggregated in the result set. Same as GROUPING
in SQL and grouping function in Scala.
grouping_id: Returns the level of grouping.
Equals to
grouping_bit(c1) * 2^(n - 1) + grouping_bit(c2) * 2^(n - 2) + ... + grouping_bit(cn)
.
approx_count_distinct(Column) since 3.0.0
approxCountDistinct(Column) since 1.4.0
kurtosis since 1.6.0
max since 1.5.0
mean since 1.5.0
min since 1.5.0
percentile_approx since 3.1.0
sd since 1.6.0
skewness since 1.6.0
stddev since 1.6.0
stddev_pop since 1.6.0
stddev_samp since 1.6.0
sum since 1.5.0
sumDistinct since 1.4.0
var since 1.6.0
variance since 1.6.0
var_pop since 1.5.0
var_samp since 1.6.0
approx_count_distinct(Column, numeric) since 3.0.0
approxCountDistinct(Column, numeric) since 1.4.0
countDistinct since 1.4.0
n_distinct since 1.4.0
collect_list since 2.3.0
collect_set since 2.3.0
grouping_bit since 2.3.0
grouping_id since 2.3.0
Other aggregate functions:
avg(),
corr(),
count(),
cov(),
first(),
last()
## Not run:
##D # Dataframe used throughout this doc
##D df <- createDataFrame(cbind(model = rownames(mtcars), mtcars))
## End(Not run)
## Not run:
##D head(select(df, approx_count_distinct(df$gear)))
##D head(select(df, approx_count_distinct(df$gear, 0.02)))
##D head(select(df, countDistinct(df$gear, df$cyl)))
##D head(select(df, n_distinct(df$gear)))
##D head(distinct(select(df, "gear")))
## End(Not run)
## Not run:
##D head(select(df, mean(df$mpg), sd(df$mpg), skewness(df$mpg), kurtosis(df$mpg)))
## End(Not run)
## Not run:
##D head(select(df, avg(df$mpg), mean(df$mpg), sum(df$mpg), min(df$wt), max(df$qsec)))
##D
##D # metrics by num of cylinders
##D tmp <- agg(groupBy(df, "cyl"), avg(df$mpg), avg(df$hp), avg(df$wt), avg(df$qsec))
##D head(orderBy(tmp, "cyl"))
##D
##D # car with the max mpg
##D mpg_max <- as.numeric(collect(agg(df, max(df$mpg))))
##D head(where(df, df$mpg == mpg_max))
## End(Not run)
## Not run:
##D head(select(df, sd(df$mpg), stddev(df$mpg), stddev_pop(df$wt), stddev_samp(df$qsec)))
## End(Not run)
## Not run:
##D head(select(df, sumDistinct(df$gear)))
##D head(distinct(select(df, "gear")))
## End(Not run)
## Not run:
##D head(agg(df, var(df$mpg), variance(df$mpg), var_pop(df$mpg), var_samp(df$mpg)))
## End(Not run)
## Not run:
##D df2 = df[df$mpg > 20, ]
##D collect(select(df2, collect_list(df2$gear)))
##D collect(select(df2, collect_set(df2$gear)))
## End(Not run)
## Not run:
##D # With cube
##D agg(
##D cube(df, "cyl", "gear", "am"),
##D mean(df$mpg),
##D grouping_bit(df$cyl), grouping_bit(df$gear), grouping_bit(df$am)
##D )
##D
##D # With rollup
##D agg(
##D rollup(df, "cyl", "gear", "am"),
##D mean(df$mpg),
##D grouping_bit(df$cyl), grouping_bit(df$gear), grouping_bit(df$am)
##D )
## End(Not run)
## Not run:
##D # With cube
##D agg(
##D cube(df, "cyl", "gear", "am"),
##D mean(df$mpg),
##D grouping_id(df$cyl, df$gear, df$am)
##D )
##D
##D # With rollup
##D agg(
##D rollup(df, "cyl", "gear", "am"),
##D mean(df$mpg),
##D grouping_id(df$cyl, df$gear, df$am)
##D )
## End(Not run)