dongjoon-hyun commented on a change in pull request #31993:
URL: https://github.com/apache/spark/pull/31993#discussion_r603399343
##########
File path:
sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/orc/OrcUtils.scala
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@@ -157,7 +158,8 @@ object OrcUtils extends Logging {
// In these cases we map the physical schema to the data schema by
index.
assert(orcFieldNames.length <= dataSchema.length, "The given data
schema " +
s"${dataSchema.catalogString} has less fields than the actual ORC
physical schema, " +
- "no idea which columns were dropped, fail to read.")
+ "no idea which columns were dropped, fail to read. Try to disable " +
+ s"${NESTED_SCHEMA_PRUNING_ENABLED.key} to workaround this issue.")
Review comment:
Although `spark.sql.optimizer.nestedSchemaPruning.enabled` is true by
default, can we hide this conf guide when
`spark.sql.optimizer.nestedSchemaPruning.enabled=false`, @wangyum ?
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