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[SPARK-26339][SQL]Throws better exception when reading files that start with underscore #23288

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KeiichiHirobe wants to merge 10 commits into from
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[SPARK-26339][SQL]Throws better exception when reading files that start with underscore #23288

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2910cb9
Throws better exception when reading files that start with underscore
Dec 10, 2018
08850ae
Clarify the message further with a different exception for file which…
Dec 14, 2018
777b4db
Revert "Clarify the message further with a different exception for fi…
Dec 25, 2018
c0a57d9
Revert "Throws better exception when reading files that start with un…
Dec 25, 2018
1b64ffb
Log a debug statement about files/directories that are ignored, and t…
Dec 25, 2018
a95637e
Change to check only filename match, not check dir recursively
Dec 29, 2018
239cfa4
Avoid checkFilesExist check
Dec 29, 2018
e72bf00
Minor modifications for clarity
Dec 29, 2018
abfe2e6
Remove debugStatement test
Dec 29, 2018
3708ef1
Fix title of test case
Dec 29, 2018
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Clarify the message further with a different exception for file which… 
… is ignored
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Hirobe Keiichi committed Dec 14, 2018
commit 08850ae2f64449bae5c449e53c00fa5051479380
10 changes: 7 additions & 3 deletions sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/DataSource.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -554,9 +554,13 @@ case class DataSource(

// Sufficient to check head of the globPath seq for non-glob scenario
// Don't need to check once again if files exist in streaming mode
if (checkFilesExist &&
(!fs.exists(globPath.head) || InMemoryFileIndex.shouldFilterOut(globPath.head.getName))) {
throw new AnalysisException(s"Path does not exist: ${globPath.head}")
if (checkFilesExist) {
val firstPath = globPath.head
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@HyukjinKwon HyukjinKwon Dec 14, 2018

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Also, does it make sense to check only the first file? Looks multiple files could be detected.

if (!fs.exists(firstPath)) {
throw new AnalysisException(s"Path does not exist: ${firstPath}")
} else if (InMemoryFileIndex.shouldFilterOut(firstPath.getName)) {
throw new AnalysisException(s"Path exists but is ignored: ${firstPath}")
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@HyukjinKwon HyukjinKwon Dec 14, 2018 •
edited
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One thing i'm not sure tho, it's going to throw an exception for, for instance,

spark.read.text("_text.txt").show()

instead of returning an empty dataframe - which is kind of a behaviour change.

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@HyukjinKwon HyukjinKwon Dec 14, 2018

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Also, looks it's going to not check children.

}
}
globPath
}.toSeq
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