Github user ericl commented on a diff in the pull request: https://github.com/apache/spark/pull/16944#discussion_r101461106 --- Diff: sql/core/src/main/scala/org/apache/spark/sql/internal/SQLConf.scala --- @@ -296,6 +296,17 @@ object SQLConf { .longConf .createWithDefault(250 * 1024 * 1024) + val HIVE_SCHEMA_INFERENCE_MODE = buildConf("spark.sql.hive.schemaInferenceMode") + .doc("Configures the action to take when a case-sensitive schema cannot be read from a Hive " + + "table's properties. Valid options include INFER_AND_SAVE (infer the case-sensitive " + + "schema from the underlying data files and write it back to the table properties), " + + "INFER_ONLY (infer the schema but don't attempt to write it to the table properties) and " + + "NEVER_INFER (fallback to using the case-insensitive metastore schema instead of inferring).") + .stringConf + .transform(_.toUpperCase()) + .checkValues(Set("INFER_AND_SAVE", "INFER_ONLY", "NEVER_INFER")) + .createWithDefault("INFER_AND_SAVE") --- End diff -- INFER_ONLY seems better to me as a default since it avoid throwing exceptions. To avoid silent performance degradation in this case, perhaps we can log a warning pointing to this config? Alternatively, I could see INFER_AND_SAVE as the default if we caught the write permission errors.
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