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Showing content from https://spark.apache.org/docs/latest/api/R/reference/structField.html below:

structField — structField • SparkR

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

structField(x, ...)

# S3 method for class 'jobj'
structField(x, ...)

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

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

A structField object.

structField since 1.4.0

if (FALSE) { # \dontrun{
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)
} # }

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