[SC-72276] Add a config and test

This PR adds a test so that we can detect #618

Author: Tathagata Das <tathagata.das1565@gmail.com>

GitOrigin-RevId: 1af03b03f64c607c8f61b41eef678f3a72355ad7

src/main/scala/org/apache/spark/sql/delta/sources/DeltaSQLConf.scala

@@ -326,6 +326,18 @@ trait DeltaSQLConfBase {
       .booleanConf
       .createWithDefault(true)
 
+  val MERGE_SKIP_OSS_RESOLUTION_WITH_STAR =
+    buildConf("merge.skipOssResolutionWithStar")
+      .internal()
+      .doc(
+        """
+          |If enabled, then any MERGE operation having UPDATE * / INSERT * will skip Apache
+          |Spark's resolution logic and use Delta's specific resolution logic. This is to avoid
+          |bug with star and temp views. See SC-72276 for details.
+        """.stripMargin)
+      .booleanConf
+      .createWithDefault(true)
+
   val DELTA_LAST_COMMIT_VERSION_IN_SESSION =
     buildConf("lastCommitVersionInSession")
       .doc("The version of the last commit made in the SparkSession for any table.")

src/test/scala/org/apache/spark/sql/delta/MergeIntoSQLSuite.scala

@@ -356,4 +356,27 @@ class MergeIntoSQLSuite extends MergeIntoSuiteBase  with DeltaSQLCommandTest {
       }
     }
   }
+
+  // This test is to capture the incorrect behavior caused by
+  // https://github.com/delta-io/delta/issues/618 .
+  // If this test fails then the issue has been fixed. Replace this test with a correct test
+  test("merge into a dataset temp views with star gives incorrect results") {
+    withTempView("v") {
+      withTempView("src") {
+        append(Seq((0, 0), (1, 1)).toDF("key", "value"))
+        readDeltaTable(tempPath).createOrReplaceTempView("v")
+        sql("CREATE TEMP VIEW src AS SELECT * FROM VALUES (10, 1) AS t(value, key)")
+        sql(s"""MERGE INTO v USING src
+             |ON src.key = v.key
+             |WHEN MATCHED THEN
+             |  UPDATE SET *
+             |WHEN NOT MATCHED THEN
+             |  INSERT *
+             |""".stripMargin)
+        val result = readDeltaTable(tempPath).as[(Long, Long)].collect().toSet
+        // This is expected to fail until the issue mentioned above is resolved.
+        assert(result != Set((0, 0), (1, 10)))
+      }
+    }
+  }
 }