[improvement](statistics)Enable estimate hive table row count using file size. (#37218) (#37694)

backport: https://github.com/apache/doris/pull/37218

fe/fe-core/src/main/java/org/apache/doris/datasource/hive/HMSExternalTable.java

@@ -875,7 +875,7 @@ public class HMSExternalTable extends ExternalTable implements MTMVRelatedTableI
         }
 
         int totalPartitionSize = partitionValues == null ? 1 : partitionValues.getIdToPartitionItem().size();
-        if (samplePartitionSize < totalPartitionSize) {
+        if (samplePartitionSize != 0 && samplePartitionSize < totalPartitionSize) {
             totalSize = totalSize * totalPartitionSize / samplePartitionSize;
         }
         return totalSize / estimatedRowSize;

fe/fe-core/src/main/java/org/apache/doris/qe/GlobalVariable.java

@@ -146,7 +146,7 @@ public final class GlobalVariable {
                             + "Getting file list may be a time-consuming operation. "
                             + "If you don't need to estimate the number of rows in the table "
                             + "or it affects performance, you can disable this feature."})
-    public static boolean enable_get_row_count_from_file_list = false;
+    public static boolean enable_get_row_count_from_file_list = true;
 
     @VariableMgr.VarAttr(name = READ_ONLY, flag = VariableMgr.GLOBAL,
             description = {"仅用于兼容MySQL生态，暂无实际意义",