SparkR (version 2.4.6)

explain: Explain

Description

Print the logical and physical Catalyst plans to the console for debugging.

Usage

explain(x, ...)
# S4 method for SparkDataFrame
explain(x, extended = FALSE)
# S4 method for StreamingQuery
explain(x, extended = FALSE)

Arguments

x

a SparkDataFrame or a StreamingQuery.

...

further arguments to be passed to or from other methods.

extended

Logical. If extended is FALSE, prints only the physical plan.

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(), dapplyCollect(), dapply(), describe(), dim(), distinct(), dropDuplicates(), dropna(), drop(), dtypes(), exceptAll(), except(), filter(), first(), gapplyCollect(), gapply(), getNumPartitions(), group_by(), head(), hint(), 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(), unionByName(), union(), unpersist(), withColumn(), withWatermark(), with(), write.df(), write.jdbc(), write.json(), write.orc(), write.parquet(), write.stream(), write.text()

Other StreamingQuery methods: awaitTermination(), isActive(), lastProgress(), queryName(), status(), stopQuery()

Examples

# NOT RUN {
sparkR.session()
path <- "path/to/file.json"
df <- read.json(path)
explain(df, TRUE)
# }
# NOT RUN {
 explain(sq) 
# }