| 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, except,
explain, filter,
first, gapplyCollect,
gapply, getNumPartitions,
group_by, head,
histogram, insertInto,
intersect, isLocal,
isStreaming, join,
limit, localCheckpoint,
merge, mutate,
ncol, nrow,
persist, printSchema,
randomSplit, rbind,
registerTempTable, rename,
repartition, rollup,
sample, saveAsTable,
schema, selectExpr,
select, showDF,
show, storageLevel,
str, subset,
summary, take,
toJSON, 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)