Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/16944#discussion_r103049318
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/internal/SQLConf.scala ---
@@ -296,6 +296,25 @@ object SQLConf {
.longConf
.createWithDefault(250 * 1024 * 1024)
+ object HiveCaseSensitiveInferenceMode extends Enumeration {
+ type HiveCaseSensitiveInferenceMode = Value
+ val INFER_AND_SAVE, INFER_ONLY, NEVER_INFER = Value
+ }
+
+ val HIVE_CASE_SENSITIVE_INFERENCE =
buildConf("spark.sql.hive.caseSensitiveInferenceMode")
+ .doc("Sets the action to take when a case-sensitive schema cannot be
read from a Hive " +
+ "table's properties. Although Spark SQL itself is not
case-sensitive, Hive compatible file " +
+ "formats such as Parquet are. Spark SQL must use a case-preserving
schema when querying " +
+ "any table backed by files containing case-sensitive field names or
queries may not return " +
+ "accurate results. Valid options include INFER_AND_SAVE (infer the
case-sensitive " +
--- End diff --
we should also mention that it's the default one
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