SaurabhChawla100 commented on a change in pull request #29045:
URL: https://github.com/apache/spark/pull/29045#discussion_r453171980
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File path:
sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/orc/OrcFileFormat.scala
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@@ -181,10 +183,19 @@ class OrcFileFormat
val readerOptions = OrcFile.readerOptions(conf).filesystem(fs)
val requestedColIdsOrEmptyFile =
Utils.tryWithResource(OrcFile.createReader(filePath, readerOptions)) {
reader =>
+ // for ORC file written by Hive, no field names
+ // in the physical schema, there is a need to send the
+ // entire dataSchema instead of required schema
+ val orcFieldNames = reader.getSchema.getFieldNames.asScala
+ if (orcFieldNames.forall(_.startsWith("_col"))) {
Review comment:
So this is for a ORC file written by Hive, no field names in the
physical schema. In that case it its having names like _col1, _col2 etc.
Check this code for reference
https://github.com/apache/spark/blob/84db660ebef4f9c543ab2709103c4542b407a829/sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/orc/OrcUtils.scala#L133
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