Github user dongjoon-hyun commented on a diff in the pull request:

    https://github.com/apache/spark/pull/12649#discussion_r60861763
  
    --- Diff: docs/sql-programming-guide.md ---
    @@ -1138,16 +1138,16 @@ for teenName in teenNames.collect():
     schemaPeople # The DataFrame from the previous example.
     
     # DataFrames can be saved as Parquet files, maintaining the schema 
information.
    -saveAsParquetFile(schemaPeople, "people.parquet")
    +write.parquet(schemaPeople, "people.parquet")
     
     # Read in the Parquet file created above. Parquet files are 
self-describing so the schema is preserved.
     # The result of loading a parquet file is also a DataFrame.
    -parquetFile <- parquetFile(sqlContext, "people.parquet")
    +parquetFile <- read.parquet(sqlContext, "people.parquet")
     
     # Parquet files can also be registered as tables and then used in SQL 
statements.
    -registerTempTable(parquetFile, "parquetFile");
    +registerTempTable(parquetFile, "parquetFile")
     teenagers <- sql(sqlContext, "SELECT name FROM parquetFile WHERE age >= 13 
AND age <= 19")
    -teenNames <- map(teenagers, function(p) { paste("Name:", p$name)})
    +teenNames <- SparkR:::lapply(teenagers, function(p) { paste("Name:", 
p$name) })
    --- End diff --
    
    Thank you, @sun-rui . 
    Then, I will update this PR by simply removing those problematic lines.


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