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[SPARK-26010][R] fix vignette eval with Java 11 #23007

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[SPARK-26010][R] fix vignette eval with Java 11 #23007

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fix
felixcheung Nov 11, 2018
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update
felixcheung Nov 11, 2018
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avoid overwrite windows set hook
felixcheung Nov 11, 2018
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test
felixcheung Nov 11, 2018
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felixcheung Nov 11, 2018
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14 changes: 14 additions & 0 deletions R/pkg/vignettes/sparkr-vignettes.Rmd
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Expand Up @@ -57,6 +57,20 @@ First, let's load and attach the package.
library(SparkR)
```

```{r, include=FALSE}
# disable eval if java version not supported
override_eval <- tryCatch(!is.numeric(SparkR:::checkJavaVersion()),
error = function(e) { TRUE },
warning = function(e) { TRUE })

if (override_eval) {
opts_hooks$set(eval = function(options) {
options$eval = FALSE
options
})
}
```

`SparkSession` is the entry point into SparkR which connects your R program to a Spark cluster. You can create a `SparkSession` using `sparkR.session` and pass in options such as the application name, any Spark packages depended on, etc.

We use default settings in which it runs in local mode. It auto downloads Spark package in the background if no previous installation is found. For more details about setup, see [Spark Session](#SetupSparkSession).
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