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https://issues.apache.org/jira/browse/SPARK-10981?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Shivaram Venkataraman updated SPARK-10981:
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Assignee: Monica Liu
> R semijoin leads to Java errors, R leftsemi leads to Spark errors
> -----------------------------------------------------------------
>
> Key: SPARK-10981
> URL: https://issues.apache.org/jira/browse/SPARK-10981
> Project: Spark
> Issue Type: Bug
> Components: R
> Affects Versions: 1.5.0
> Environment: SparkR from RStudio on Macbook
> Reporter: Monica Liu
> Assignee: Monica Liu
> Priority: Minor
> Labels: easyfix, newbie
> Fix For: 1.5.2, 1.6.0
>
>
> I am using SparkR from RStudio, and I ran into an error with the join
> function that I recreated with a smaller example:
> {code:title=joinTest.R|borderStyle=solid}
> Sys.setenv(SPARK_HOME="/Users/liumo1/Applications/spark/")
> .libPaths(c(file.path(Sys.getenv("SPARK_HOME"), "R", "lib"), .libPaths()))
> library(SparkR)
> sc <- sparkR.init("local[4]")
> sqlContext <- sparkRSQL.init(sc)
> n = c(2, 3, 5)
> s = c("aa", "bb", "cc")
> b = c(TRUE, FALSE, TRUE)
> df = data.frame(n, s, b)
> df1= createDataFrame(sqlContext, df)
> showDF(df1)
> x = c(2, 3, 10)
> t = c("dd", "ee", "ff")
> c = c(FALSE, FALSE, TRUE)
> dff = data.frame(x, t, c)
> df2 = createDataFrame(sqlContext, dff)
> showDF(df2)
> res = join(df1, df2, df1$n == df2$x, "semijoin")
> showDF(res)
> {code}
> Running this code, I encountered the error:
> {panel}
> Error in invokeJava(isStatic = FALSE, objId$id, methodName, ...) :
> java.lang.IllegalArgumentException: Unsupported join type 'semijoin'.
> Supported join types include: 'inner', 'outer', 'full', 'fullouter',
> 'leftouter', 'left', 'rightouter', 'right', 'leftsemi'.
> {panel}
> However, if I changed the joinType to "leftsemi",
> {code}
> res = join(df1, df2, df1$n == df2$x, "leftsemi")
> {code}
> I would get the error:
> {panel}
> Error in .local(x, y, ...) :
> joinType must be one of the following types: 'inner', 'outer',
> 'left_outer', 'right_outer', 'semijoin'
> {panel}
> Since the join function in R appears to invoke a Java method, I went into
> DataFrame.R and changed the code on line 1374 and line 1378 to change the
> "semijoin" to "leftsemi" to match the Java function's parameters. These also
> make the R joinType accepted values match those of Scala's.
> semijoin:
> {code:title=DataFrame.R: join(x, y, joinExpr, joinType)|borderStyle=solid}
> if (joinType %in% c("inner", "outer", "left_outer", "right_outer",
> "semijoin")) {
> sdf <- callJMethod(x@sdf, "join", y@sdf, joinExpr@jc, joinType)
> }
> else {
> stop("joinType must be one of the following types: ",
> "'inner', 'outer', 'left_outer', 'right_outer', 'semijoin'")
> }
> {code}
> leftsemi:
> {code:title=DataFrame.R: join(x, y, joinExpr, joinType)|borderStyle=solid}
> if (joinType %in% c("inner", "outer", "left_outer", "right_outer",
> "leftsemi")) {
> sdf <- callJMethod(x@sdf, "join", y@sdf, joinExpr@jc, joinType)
> }
> else {
> stop("joinType must be one of the following types: ",
> "'inner', 'outer', 'left_outer', 'right_outer', 'leftsemi'")
> }
> {code}
> This fixed the issue, but I'm not sure if this solution breaks hive
> compatibility or causes other issues, but I can submit a pull request to
> change this
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