Join
join.RdJoins two SparkDataFrames based on the given join expression.
Usage
# S4 method for class 'SparkDataFrame,SparkDataFrame'
join(x, y, joinExpr = NULL, joinType = NULL)Arguments
- x
A SparkDataFrame
- y
A SparkDataFrame
- joinExpr
(Optional) The expression used to perform the join. joinExpr must be a Column expression. If joinExpr is omitted, the default, inner join is attempted and an error is thrown if it would be a Cartesian Product. For Cartesian join, use crossJoin instead.
- joinType
The type of join to perform, default 'inner'. Must be one of: 'inner', 'cross', 'outer', 'full', 'fullouter', 'full_outer', 'left', 'leftouter', 'left_outer', 'right', 'rightouter', 'right_outer', 'semi', 'leftsemi', 'left_semi', 'anti', 'leftanti', 'left_anti'.
See also
Other SparkDataFrame functions:
SparkDataFrame-class,
agg(),
alias(),
arrange(),
as.data.frame(),
attach,SparkDataFrame-method,
broadcast(),
cache(),
checkpoint(),
coalesce(),
collect(),
colnames(),
coltypes(),
createOrReplaceTempView(),
crossJoin(),
cube(),
dapply(),
dapplyCollect(),
describe(),
dim(),
distinct(),
drop(),
dropDuplicates(),
dropna(),
dtypes(),
except(),
exceptAll(),
explain(),
filter(),
first(),
gapply(),
gapplyCollect(),
getNumPartitions(),
group_by(),
head(),
hint(),
histogram(),
insertInto(),
intersect(),
intersectAll(),
isLocal(),
isStreaming(),
limit(),
localCheckpoint(),
merge(),
mutate(),
ncol(),
nrow(),
persist(),
printSchema(),
randomSplit(),
rbind(),
rename(),
repartition(),
repartitionByRange(),
rollup(),
sample(),
saveAsTable(),
schema(),
select(),
selectExpr(),
show(),
showDF(),
storageLevel(),
str(),
subset(),
summary(),
take(),
toJSON(),
union(),
unionAll(),
unionByName(),
unpersist(),
unpivot(),
with(),
withColumn(),
withWatermark(),
write.df(),
write.jdbc(),
write.json(),
write.orc(),
write.parquet(),
write.stream(),
write.text()
Examples
if (FALSE) { # \dontrun{
sparkR.session()
df1 <- read.json(path)
df2 <- read.json(path2)
join(df1, df2, df1$col1 == df2$col2) # Performs an inner join based on expression
join(df1, df2, df1$col1 == df2$col2, "right_outer")
join(df1, df2) # Attempts an inner join
} # }