SparkR (version 3.1.2)

structField: structField

Description

Create a structField object that contains the metadata for a single field in a schema.

Usage

structField(x, ...)
# S3 method for jobj
structField(x, ...)
# S3 method for character
structField(x, type, nullable = TRUE, ...)

Arguments

x

the name of the field.

...

additional argument(s) passed to the method.

type

The data type of the field

nullable

A logical vector indicating whether or not the field is nullable

Value

A structField object.

Examples

# NOT RUN {
field1 <- structField("a", "integer")
field2 <- structField("c", "string")
field3 <- structField("avg", "double")
schema <- structType(field1, field2, field3)
df1 <- gapply(df, list("a", "c"),
              function(key, x) { y <- data.frame(key, mean(x$b), stringsAsFactors = FALSE) },
              schema)
# }