Github user dongjoon-hyun commented on a diff in the pull request:
https://github.com/apache/spark/pull/22262#discussion_r216119226
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/orc/OrcUtils.scala
---
@@ -116,6 +116,14 @@ object OrcUtils extends Logging {
})
} else {
val resolver = if (isCaseSensitive) caseSensitiveResolution else
caseInsensitiveResolution
+ // Need to fail if there is ambiguity, i.e. more than one field is
matched.
+ requiredSchema.fieldNames.foreach { requiredFieldName =>
+ val matchedOrcFields = orcFieldNames.filter(resolver(_,
requiredFieldName))
--- End diff --
Sorry, @seancxmao . We need to update once more. I'll make a PR to you.
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