structField
structField.Rd
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
Examples
if (FALSE) {
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)
}