Add configs for converting date and timestamp stats for cloned delta table from iceberg (delta-io#4362)

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## Description

Add configs for converting date and timestamp stats

## How was this patch tested?
UTs

Author: ChengJi-db

iceberg/src/main/scala/org/apache/spark/sql/delta/IcebergStatsUtils.scala

@@ -48,6 +48,8 @@ object IcebergStatsUtils extends DeltaLogging {
   // The stats for these types will be converted to Delta stats
   // except for following types:
   //  DECIMAL (decided by DeltaSQLConf.DELTA_CONVERT_ICEBERG_DECIMAL_STATS)
+  //  DATE (decided by DeltaSQLConf.DELTA_CONVERT_ICEBERG_DATE_STATS)
+  //  TIMESTAMP (decided by DeltaSQLConf.DELTA_CONVERT_ICEBERG_TIMESTAMP_STATS)
   // which are decided by spark configs dynamically
   private val STATS_ALLOW_TYPES = Set[TypeID](
     TypeID.BOOLEAN,
@@ -66,13 +68,17 @@ object IcebergStatsUtils extends DeltaLogging {
     TypeID.DECIMAL
   )
 
+  private val CONFIGS_TO_STATS_ALLOW_TYPES = Map(
+    DeltaSQLConf.DELTA_CONVERT_ICEBERG_DATE_STATS -> TypeID.DATE,
+    DeltaSQLConf.DELTA_CONVERT_ICEBERG_TIMESTAMP_STATS -> TypeID.TIMESTAMP,
+    DeltaSQLConf.DELTA_CONVERT_ICEBERG_DECIMAL_STATS -> TypeID.DECIMAL
+  )
+
   def typesAllowStatsConversion(spark: SparkSession): Set[TypeID] = {
-    val statsDisallowTypes =
-      if (spark.sessionState.conf.getConf(DeltaSQLConf.DELTA_CONVERT_ICEBERG_DECIMAL_STATS)) {
-        Set.empty[TypeID]
-      } else {
-        Set(TypeID.DECIMAL)
-      }
+    val statsDisallowTypes = CONFIGS_TO_STATS_ALLOW_TYPES.filter {
+      case (conf, _) => !spark.sessionState.conf.getConf(conf)
+    }.values.toSet
+
     typesAllowStatsConversion(statsDisallowTypes)
   }
 

iceberg/src/test/scala/org/apache/spark/sql/delta/commands/convert/IcebergStatsUtilsSuite.scala

@@ -23,15 +23,20 @@ import java.util.{List => JList, Map => JMap}
 
 import scala.collection.JavaConverters._
 
+import org.apache.spark.sql.delta.sources.DeltaSQLConf
 import org.apache.spark.sql.delta.util.JsonUtils
 import org.apache.iceberg.{DataFile, FileContent, FileFormat, PartitionData, PartitionSpec, Schema, StructLike}
 import org.apache.iceberg.transforms._
 import org.apache.iceberg.types.Conversions
+import org.apache.iceberg.types.Type
+import org.apache.iceberg.types.Type.TypeID
 import org.apache.iceberg.types.Types._
 
 import org.apache.spark.SparkFunSuite
+import org.apache.spark.internal.config.ConfigEntry
+import org.apache.spark.sql.test.SharedSparkSession
 
-class IcebergStatsUtilsSuite extends SparkFunSuite {
+class IcebergStatsUtilsSuite extends SparkFunSuite with SharedSparkSession {
 
   private val StatsAllowTypes =
     IcebergStatsUtils.typesAllowStatsConversion(statsDisallowTypes = Set.empty)

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

@@ -2353,6 +2353,20 @@ trait DeltaSQLConfBase {
     .booleanConf
     .createWithDefault(true)
 
+  val DELTA_CONVERT_ICEBERG_DATE_STATS = buildConf("collectStats.convertIceberg.date")
+    .internal()
+    .doc("When enabled, attempts to convert Iceberg stats for DATE to Delta stats" +
+      "when cloning from an Iceberg source.")
+    .booleanConf
+    .createWithDefault(true)
+
+  val DELTA_CONVERT_ICEBERG_TIMESTAMP_STATS = buildConf("collectStats.convertIceberg.timestamp")
+    .internal()
+    .doc("When enabled, attempts to convert Iceberg stats for TIMESTAMP to Delta stats" +
+      "when cloning from an Iceberg source.")
+    .booleanConf
+    .createWithDefault(true)
+
   /////////////////////
   // Optimized Write
   /////////////////////