jzhuge opened a new pull request #25372: [SPARK-28640][SQL] Only give warning when session catalog is not defined URL: https://github.com/apache/spark/pull/25372 ## What changes were proposed in this pull request? LookupCatalog.sessionCatalog logs an error message and the exception stack upon any nonfatal exception. When session catalog is not defined, this may alarm the user unnecessarily. It should be enough to give a warning and return None. ## How was this patch tested? Manually run `spark.sessionState.analyzer.sessionCatalog` in Spark shell, expect a warning, not an error and a stack trace. ``` scala> spark.sessionState.analyzer.sessionCatalog 2019-08-06 15:43:23,068 WARN [main] hive.HiveSessionStateBuilder$$anon$1 (Logging.scala:logWarning(69)) - Session catalog is not defined res1: Option[org.apache.spark.sql.catalog.v2.CatalogPlugin] = None ```
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