| hint {SparkR} | R Documentation |
Specifies execution plan hint and return a new SparkDataFrame.
hint(x, name, ...) ## S4 method for signature 'SparkDataFrame,character' hint(x, name, ...)
x |
a SparkDataFrame. |
name |
a name of the hint. |
... |
optional parameters for the hint. |
A SparkDataFrame.
hint since 2.2.0
Other SparkDataFrame functions: SparkDataFrame-class,
agg, arrange,
as.data.frame,
attach,SparkDataFrame-method,
cache, checkpoint,
coalesce, collect,
colnames, coltypes,
createOrReplaceTempView,
crossJoin, dapplyCollect,
dapply, describe,
dim, distinct,
dropDuplicates, dropna,
drop, dtypes,
except, explain,
filter, first,
gapplyCollect, gapply,
getNumPartitions, group_by,
head, histogram,
insertInto, intersect,
isLocal, isStreaming,
join, limit,
merge, mutate,
ncol, nrow,
persist, printSchema,
randomSplit, rbind,
registerTempTable, rename,
repartition, sample,
saveAsTable, schema,
selectExpr, select,
showDF, show,
storageLevel, str,
subset, take,
toJSON, union,
unpersist, withColumn,
with, write.df,
write.jdbc, write.json,
write.orc, write.parquet,
write.stream, write.text
## Not run:
##D df <- createDataFrame(mtcars)
##D avg_mpg <- mean(groupBy(createDataFrame(mtcars), "cyl"), "mpg")
##D
##D head(join(df, hint(avg_mpg, "broadcast"), df$cyl == avg_mpg$cyl))
## End(Not run)