gengliangwang opened a new pull request #25094: [SPARK-28331][SQL] Catalogs.load always throws CatalogNotFoundException on loading built-in catalogs URL: https://github.com/apache/spark/pull/25094 ## What changes were proposed in this pull request? In `Catalogs.load`, the `pluginClassName` in the following code ``` String pluginClassName = conf.getConfString("spark.sql.catalog." + name, null); ``` is always null for built-in catalogs, e.g there is a SQLConf entry `spark.sql.catalog.session`. This is because of https://github.com/apache/spark/pull/18852: SQLConf.conf.getConfString(key, null) always returns null. ## How was this patch tested? Apply code changes of https://github.com/apache/spark/pull/24768 and tried loading session catalog.
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