Github user jiangxb1987 commented on a diff in the pull request:
https://github.com/apache/spark/pull/16233#discussion_r95711504
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/Analyzer.scala
---
@@ -50,6 +50,36 @@ object SimpleAnalyzer extends Analyzer(
new SimpleCatalystConf(caseSensitiveAnalysis = true))
/**
+ * Provides a way to keep state during the analysis, this enables us to
decouple the concerns
+ * of analysis environment from the catalog.
+ *
+ * Note this is thread local.
+ *
+ * @param defaultDatabase The default database used in the view
resolution, this overrules the
+ * current catalog database.
+ * @param nestedViewLevel The nested level in the view resolution, this
enables us to limit the
+ * depth of nested views.
--- End diff --
I've added a TODO under this.
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