| structField {SparkR} | R Documentation |
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
## Not run:
##D field1 <- structField("a", "integer")
##D field2 <- structField("c", "string")
##D field3 <- structField("avg", "double")
##D schema <- structType(field1, field2, field3)
##D df1 <- gapply(df, list("a", "c"),
##D function(key, x) { y <- data.frame(key, mean(x$b), stringsAsFactors = FALSE) },
##D schema)
## End(Not run)