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https://issues.apache.org/jira/browse/SPARK-16466?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Sean Owen resolved SPARK-16466.
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Resolution: Not A Problem
> names() function allows creation of column name containing "-". filter()
> function subsequently fails
> -----------------------------------------------------------------------------------------------------
>
> Key: SPARK-16466
> URL: https://issues.apache.org/jira/browse/SPARK-16466
> Project: Spark
> Issue Type: Bug
> Components: SparkR
> Affects Versions: 1.6.1
> Environment: Databricks.com
> Reporter: Neil Dewar
> Priority: Minor
> Fix For: 1.6.2
>
>
> If I assign names to a DataFrame using the names() function, it allows the
> introduction of "-" characters that caused the filter() function to
> subsequently fail. I am unclear if other special characters cause similar
> problems.
> Example:
> sdfCar <- createDataFrame(sqlContext, mtcars)
> names(sdfCar) <- c("mpg", "cyl", "disp", "hp", "drat", "wt", "qsec", "vs",
> "am", "gear", "carb-count") # note: carb renamed to carb-count
> sdfCar3 <- filter(sdfCar, carb-count==4)
> Above fails with error: failure: identifier expected carb-count==4. This
> logic appears to be assuming that the "-" in the column name is a minus sign.
> I am unsure if the problem here is that "-" is illegal in a column name, or
> if the filter function should be able to handle "-" in a column name, but one
> or the other must be wrong.
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