SparkR (version 3.1.2)

structType: structType

Description

Create a structType object that contains the metadata for a SparkDataFrame. Intended for use with createDataFrame and toDF.

Usage

structType(x, ...)
# S3 method for jobj
structType(x, ...)
# S3 method for structField
structType(x, ...)
# S3 method for character
structType(x, ...)

Arguments

x

a structField object (created with the structField method). Since Spark 2.3, this can be a DDL-formatted string, which is a comma separated list of field definitions, e.g., "a INT, b STRING".

...

additional structField objects

Value

a structType object

Examples

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