HyukjinKwon commented on pull request #34093:
URL: https://github.com/apache/spark/pull/34093#issuecomment-927223051
Seems related test failure:
```
`write.df(df, source = "csv")` threw an error with unexpected message.
Expected match: "Error in save :
org.apache.spark.SparkIllegalArgumentException: Expected exactly one path to
be specified"
Actual message: "Error in save :
org.apache.spark.SparkIllegalArgumentException: Expected exactly one path to be
specified, but got: \n\tat
org.apache.spark.sql.errors.QueryExecutionErrors$.multiplePathsSpecifiedError(QueryExecutionErrors.scala:450)\n\tat
org.apache.spark.sql.execution.datasources.DataSource.planForWritingFileFormat(DataSource.scala:464)\n\tat
org.apache.spark.sql.execution.datasources.DataSource.planForWriting(DataSource.scala:558)\n\tat
org.apache.spark.sql.DataFrameWriter.saveToV1Source(DataFrameWriter.scala:382)\n\tat
org.apache.spark.sql.DataFrameWriter.saveInternal(DataFrameWriter.scala:355)\n\tat
org.apache.spark.sql.DataFrameWriter.save(DataFrameWriter.scala:247)\n\tat
sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)\n\tat
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)\n\tat
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)\n\tat
java.lang.reflect.Method.invoke(Method.java:498)\n
\tat
org.apache.spark.api.r.RBackendHandler.handleMethodCall(RBackendHandler.scala:164)\n\tat
org.apache.spark.api.r.RBackendHandler.channelRead0(RBackendHandler.scala:105)\n\tat
org.apache.spark.api.r.RBackendHandler.channelRead0(RBackendHandler.scala:39)\n\tat
io.netty.channel.SimpleChannelInboundHandler.channelRead(SimpleChannelInboundHandler.java:99)\n\tat
io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379)\n\tat
io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:365)\n\tat
io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:357)\n\tat
io.netty.handler.timeout.IdleStateHandler.channelRead(IdleStateHandler.java:286)\n\tat
io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379)\n\tat
io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:365)\
n\tat
io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:357)\n\tat
io.netty.handler.codec.MessageToMessageDecoder.channelRead(MessageToMessageDecoder.java:103)\n\tat
io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379)\n\tat
io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:365)\n\tat
io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:357)\n\tat
io.netty.handler.codec.ByteToMessageDecoder.fireChannelRead(ByteToMessageDecoder.java:324)\n\tat
io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:296)\n\tat
io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379)\n\tat
io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:365)\n\tat
io.netty.channel.AbstractChannelHandlerC
ontext.fireChannelRead(AbstractChannelHandlerContext.java:357)\n\tat
io.netty.channel.DefaultChannelPipeline$HeadContext.channelRead(DefaultChannelPipeline.java:1410)\n\tat
io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379)\n\tat
io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:365)\n\tat
io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:919)\n\tat
io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:166)\n\tat
io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:719)\n\tat
io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:655)\n\tat
io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:581)\n\tat
io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:493)\n\tat
io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecuto
r.java:986)\n\tat
io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74)\n\tat
io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)\n\tat
java.lang.Thread.run(Thread.java:748)\n\n"
Backtrace:
1. testthat::expect_error(...) test_sparkSQL.R:3875:2
7. SparkR::write.df(df, source = "csv")
8. SparkR:::.local(df, path, ...)
9. SparkR:::handledCallJMethod(write, "save")
10. base::tryCatch(...)
11. base:::tryCatchList(expr, classes, parentenv, handlers)
12. base:::tryCatchOne(expr, names, parentenv, handlers[[1L]])
13. value[[3L]](cond)
14. SparkR:::captureJVMException(e, method)
```
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