amaliujia commented on code in PR #36586:
URL: https://github.com/apache/spark/pull/36586#discussion_r888374320


##########
sql/core/src/main/scala/org/apache/spark/sql/catalog/interface.scala:
##########
@@ -64,12 +64,26 @@ class Database(
 @Stable
 class Table(
     val name: String,
-    @Nullable val database: String,
+    @Nullable val qualifier: Array[String],
     @Nullable val description: String,
     val tableType: String,
     val isTemporary: Boolean)
   extends DefinedByConstructorParams {
 
+  def database: String = parseQualifier
+
+  def parseQualifier: String = {
+    if (qualifier == null) {
+      null
+    } else if (qualifier.length == 2) {
+      qualifier(1)
+    } else if (qualifier.length == 1) {

Review Comment:
   for example if a table is `catalog1.db1.table1`,
   
   In this case `catalog_name=catalog1, qualifier=[db1], table_name=table1`?



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