[fix](iceberg-v2) fix fe iceberg split, add regression case (#15299)

fe/fe-core/src/main/java/org/apache/doris/planner/external/QueryScanProvider.java

@@ -106,7 +106,7 @@ public abstract class QueryScanProvider implements FileScanProviderIf {
                 TFileRangeDesc rangeDesc = createFileRangeDesc(fileSplit, partitionValuesFromPath, pathPartitionKeys);
                 // external data lake table
                 if (split instanceof IcebergSplit) {
-                    IcebergScanProvider.setIcebergParams(rangeDesc, (IcebergSplit) inputSplit);
+                    IcebergScanProvider.setIcebergParams(rangeDesc, (IcebergSplit) split);
                 }
                 curLocations.getScanRange().getExtScanRange().getFileScanRange().addToRanges(rangeDesc);
                 LOG.debug("assign to backend {} with table split: {} ({}, {}), location: {}",

regression-test/data/external_table_emr_p2/iceberg/test_external_catalog_icebergv2.out

@@ -1,27 +1,33 @@
 -- This file is automatically generated. You should know what you did if you want to edit this
 -- !q01 --
-149990
+149988
 
 -- !q02 --
-45132671
+1
+3
+4
+7
 
 -- !q03 --
-0
+45132671
 
 -- !q04 --
+0
+
+-- !q05 --
 1  Customer#000000001  IVhzIApeRb ot,c,E                        15  25-989-741-2988     711.56  BUILDING      to the even, regular platelets. regular, ironic epitaphs nag e                                         |
 2  Customer#000000002  XSTf4,NCwDVaWNe6tEgvwfmRchLXak           13  23-768-687-3665     121.65  AUTOMOBILE    l accounts. blithely ironic theodolites integrate boldly: caref                                        |
 3  Customer#000000003  MG9kdTD2WBHm                              1  11-719-748-3364    7498.12  AUTOMOBILE     deposits eat slyly ironic, even instructions. express foxes detect slyly. blithely even accounts abov |
 
--- !q05 -
+-- !q06 -
 366778465
 366778561
 366778657
 
--- !q06 --
+-- !q07 --
 10539361
 130424833
 2736865
 
--- !q07 --
+-- !q08 --
 1499999990

regression-test/suites/external_table_emr_p2/iceberg/test_external_catalog_icebergv2.groovy

@@ -34,12 +34,13 @@ suite("test_external_catalog_icebergv2", "p2") {
         // test parquet format format
         def q01 = {
             qt_q01 """ select count(1) as c from customer_small;"""
-            qt_q02 """ select count(1) from orders """
-            qt_q03 """ select count(1) from customer_small where c_name = 'Customer#0063356' order by c_custkey limit 1; """
-            qt_q04 """ select * from customer_small order by c_custkey limit 3 """
-            qt_q05 """ select o_orderkey from orders where o_orderkey > 652566 limit 3"""
-            qt_q06 """ select o_orderkey from orders where o_custkey < 3357 limit 3"""
-            qt_q07 """ select count(1) as c from customer;"""
+            qt_q02 """ select c_custkey from customer_small group by c_custkey limit 4;"""
+            qt_q03 """ select count(1) from orders """
+            qt_q04 """ select count(1) from customer_small where c_name = 'Customer#0063356' order by c_custkey limit 1; """
+            qt_q05 """ select * from customer_small order by c_custkey limit 3 """
+            qt_q06 """ select o_orderkey from orders where o_orderkey > 652566 limit 3"""
+            qt_q07 """ select o_orderkey from orders where o_custkey < 3357 limit 3"""
+            qt_q08 """ select count(1) as c from customer;"""
         }
         sql """ use `tpch_1000_icebergv2`; """
         q01()