column_misc_functions: Miscellaneous functions for Column operations

In SparkR: R Front End for 'Apache Spark'

Description

Miscellaneous functions defined for Column.

Usage

assert_true(x, errMsg = NULL)

crc32(x)

hash(x, ...)

md5(x)

raise_error(x)

sha1(x)

sha2(y, x)

xxhash64(x, ...)

## S4 method for signature 'Column'
crc32(x)

## S4 method for signature 'Column'
hash(x, ...)

## S4 method for signature 'Column'
xxhash64(x, ...)

## S4 method for signature 'Column'
assert_true(x, errMsg = NULL)

## S4 method for signature 'characterOrColumn'
raise_error(x)

## S4 method for signature 'Column'
md5(x)

## S4 method for signature 'Column'
sha1(x)

## S4 method for signature 'Column,numeric'
sha2(y, x)

Arguments

x	Column to compute on. In sha2, it is one of 224, 256, 384, or 512.
errMsg	(optional) The error message to be thrown.
...	additional Columns.
y	Column to compute on.

Details

crc32: Calculates the cyclic redundancy check value (CRC32) of a binary column and returns the value as a bigint.

hash: Calculates the hash code of given columns, and returns the result as an int column.

xxhash64: Calculates the hash code of given columns using the 64-bit variant of the xxHash algorithm, and returns the result as a long column.

assert_true: Returns null if the input column is true; throws an exception with the provided error message otherwise.

raise_error: Throws an exception with the provided error message.

md5: Calculates the MD5 digest of a binary column and returns the value as a 32 character hex string.

sha1: Calculates the SHA-1 digest of a binary column and returns the value as a 40 character hex string.

sha2: Calculates the SHA-2 family of hash functions of a binary column and returns the value as a hex string. The second argument x specifies the number of bits, and is one of 224, 256, 384, or 512.

Note

crc32 since 1.5.0

hash since 2.0.0

xxhash64 since 3.0.0

assert_true since 3.1.0

raise_error since 3.1.0

md5 since 1.5.0

sha1 since 1.5.0

sha2 since 1.5.0

Examples

## Not run: 
# Dataframe used throughout this doc
df <- createDataFrame(cbind(model = rownames(mtcars), mtcars)[, 1:2])
tmp <- mutate(df, v1 = crc32(df$model), v2 = hash(df$model),
                  v3 = hash(df$model, df$mpg), v4 = md5(df$model),
                  v5 = sha1(df$model), v6 = sha2(df$model, 256))
head(tmp)
## End(Not run)
## Not run: 
tmp <- mutate(df, v1 = assert_true(df$vs < 2),
                  v2 = assert_true(df$vs < 2, "custom error message"),
                  v3 = assert_true(df$vs < 2, df$vs))
head(tmp)
## End(Not run)
## Not run: 
tmp <- mutate(df, v1 = raise_error("error message"))
head(tmp)
## End(Not run)

SparkR documentation built on June 3, 2021, 5:05 p.m.