Github user wangmiao1981 commented on the issue:
https://github.com/apache/spark/pull/18496
Actually, the udf in transform() of StringIndexer.scala, will throw an
exception in action. But, it doesn't stop the execution of collect().
val indexer = udf { label: String =>
if (label == null) {
if (keepInvalid) {
labels.length
} else {
throw new SparkException("StringIndexer encountered NULL value.
To handle or skip " +
"NULLS, try setting StringIndexer.handleInvalid.")
}
} else {
if (labelToIndex.contains(label)) {
labelToIndex(label)
} else if (keepInvalid) {
labels.length
} else {
throw new SparkException(s"Unseen label: $label. To handle
unseen labels, " +
s"set Param handleInvalid to ${StringIndexer.KEEP_INVALID}.")
<=== this is the exception.
}
}
}
I am asking other people who are familiar with this logic to understand why
it doesn't stop the collect().
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