[spark] Add currentSnapshotId to the description in paimon scan

Author: kerwin-zk

paimon-spark/paimon-spark-common/src/main/scala/org/apache/paimon/spark/PaimonBaseScan.scala

@@ -26,6 +26,9 @@ import org.apache.paimon.spark.sources.PaimonMicroBatchStream
 import org.apache.paimon.spark.statistics.StatisticsHelper
 import org.apache.paimon.table.{DataTable, InnerTable}
 import org.apache.paimon.table.source.{InnerTableScan, Split}
+import org.apache.paimon.table.source.snapshot.TimeTravelUtil
+import org.apache.paimon.table.system.FilesTable
+import org.apache.paimon.utils.{SnapshotManager, TagManager}
 
 import org.apache.spark.sql.connector.metric.{CustomMetric, CustomTaskMetric}
 import org.apache.spark.sql.connector.read.{Batch, Scan, Statistics, SupportsReportStatistics}
@@ -132,12 +135,47 @@ abstract class PaimonBaseScan(
     } else {
       ""
     }
-    val latestSnapshotIdStr = if (table.latestSnapshot().isPresent) {
-      s", LatestSnapshotId: [${table.latestSnapshot().get.id}],"
+
+    val latestSnapshotId = if (table.latestSnapshot().isPresent) {
+      Some(table.latestSnapshot().get.id)
+    } else {
+      None
+    }
+
+    val latestSnapshotIdStr = if (latestSnapshotId.isDefined) {
+      s", LatestSnapshotId: [${latestSnapshotId.get}]"
     } else {
       ""
     }
-    s"PaimonScan: [${table.name}]" + latestSnapshotIdStr + pushedFiltersStr + pushedTopNFilterStr +
+
+    val currentSnapshot =
+      try {
+        val dataTable = table match {
+          case dt: DataTable => dt
+          case _ => null
+        }
+
+        if (dataTable != null) {
+          TimeTravelUtil.tryTravelToSnapshot(
+            coreOptions.toConfiguration,
+            dataTable.snapshotManager(),
+            dataTable.tagManager())
+        } else {
+          Optional.empty()
+        }
+      } catch {
+        case _: Exception => Optional.empty()
+      }
+
+    val currentSnapshotIdStr = if (currentSnapshot.isPresent) {
+      s", currentSnapshotId: [${currentSnapshot.get().id}]"
+    } else if (latestSnapshotId.isDefined) {
+      s", currentSnapshotId: [${latestSnapshotId.get}]"
+    } else {
+      ""
+    }
+
+    s"PaimonScan: [${table.name}]" + latestSnapshotIdStr + currentSnapshotIdStr + pushedFiltersStr + pushedTopNFilterStr +
       pushDownLimit.map(limit => s", Limit: [$limit]").getOrElse("")
   }
 }