Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/19719#discussion_r150366512
--- Diff: sql/hive/src/main/scala/org/apache/spark/sql/hive/HiveUtils.scala
---
@@ -66,6 +66,12 @@ private[spark] object HiveUtils extends Logging {
.stringConf
.createWithDefault(builtinHiveVersion)
+ // A deprecated config which is only used to provide a default value, in
case some existing
+ // applications depend on this config, e.g. Spark SQL ODBC driver.
--- End diff --
it's ODBC. Actually it's something out of Spark's control, we must be
careful and avoid behavior changes, like `conf.get("spark.sql.hive.version")`
should still return `1.2.1` instead of null.
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