use UnresolvedAttribute.quoted instead

Author: zsxwing

sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/Analyzer.scala

@@ -1399,7 +1399,9 @@ class Analyzer(override val catalogManager: CatalogManager)
               // ResolveOutputRelation runs, using the query's column names that will match the
               // table names at that point. because resolution happens after a future rule, create
               // an UnresolvedAttribute.
-              EqualNullSafe(UnresolvedAttribute(attr.name), Cast(Literal(value), attr.dataType))
+              EqualNullSafe(
+                UnresolvedAttribute.quoted(attr.name),
+                Cast(Literal(value), attr.dataType))
             case None =>
               throw QueryCompilationErrors.unknownStaticPartitionColError(name)
           }

sql/core/src/test/scala/org/apache/spark/sql/connector/InsertIntoTests.scala

@@ -477,5 +477,15 @@ trait InsertIntoSQLOnlyTests
         verifyTable(t1, spark.table(view))
       }
     }
+
+    test("SPARK-34599: InsertInto: overwrite - dot in the partition column name - static mode") {
+      import testImplicits._
+      val t1 = "tbl"
+      withTable(t1) {
+        sql(s"CREATE TABLE $t1 (`a.b` string, `c.d` string) USING $v2Format PARTITIONED BY (`a.b`)")
+        sql(s"INSERT OVERWRITE $t1 PARTITION (`a.b` = 'a') (`c.d`) VALUES('b')")
+        verifyTable(t1, Seq("a" -> "b").toDF("id", "data"))
+      }
+    }
   }
 }