| 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, alias,
arrange, as.data.frame,
attach,SparkDataFrame-method,
broadcast, cache,
checkpoint, coalesce,
collect, colnames,
coltypes,
createOrReplaceTempView,
crossJoin, cube,
dapplyCollect, dapply,
describe, dim,
distinct, dropDuplicates,
dropna, drop,
dtypes, exceptAll,
except, explain,
filter, first,
gapplyCollect, gapply,
getNumPartitions, group_by,
head, histogram,
insertInto, intersectAll,
intersect, isLocal,
isStreaming, join,
limit, localCheckpoint,
merge, mutate,
ncol, nrow,
persist, printSchema,
randomSplit, rbind,
rename, repartitionByRange,
repartition, rollup,
sample, saveAsTable,
schema, selectExpr,
select, showDF,
show, storageLevel,
str, subset,
summary, take,
toJSON, unionAll,
unionByName, union,
unpersist, withColumn,
withWatermark, 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)