[regression-test](variant nested) fix unsupported session var in 3.0

regression-test/suites/variant_p0/nested.groovy

@@ -131,9 +131,7 @@ suite("regression_test_variant_nested", "p0"){
         sql """INSERT INTO var_nested SELECT *, '{"k2":1, "k3": "nice", "k4" : [1234], "k5" : 1.10000, "k6" : [[123]], "nested2" : {"nested1" : [{"a" : 10, "b" : 1.1, "c" : "1111"}]}}' FROM numbers("number" = "5013") where number >= 400 limit 1024;"""
         triger_compaction.call()
 
-        qt_sql """select  /*+SET_VAR(batch_size=1024,broker_load_batch_size=16352,disable_streaming_preaggregations=true,enable_distinct_streaming_aggregation=true,parallel_fragment_exec_
-parallel_pipeline_task_num=7,parallel_fragment_exec_instance_num=4,profile_level=1,enable_pipeline_engine=true,enable_parallel_scan=false,parallel_scan_max_scanners_count=16
-,parallel_scan_min_rows_per_scanner=128,enable_fold_constant_by_be=false,enable_rewrite_element_at_to_slot=true,runtime_filter_type=2,enable_parallel_result_sink=true,sort_phase_num=0,enable_nereids_planner=true,rewrite_or_to_in_predicate_threshold=2,enable_function_pushdown=true,enable_common_expr_pushdown=false,enable_local_exchange=true,partitioned_hash_join_rows_threshold=8,partitioned_hash_agg_rows_threshold=8,partition_pruning_expand_threshold=10,enable_share_hash_table_for_broadcast_join=false,enable_two_phase_read_opt=true,enable_common_expr_pushdown_for_inverted_index=true,enable_delete_sub_predicate_v2=true,min_revocable_mem=1,fetch_remote_schema_timeout_seconds=120,max_fetch_remote_schema_tablet_count=512,enable_join_spill=true,enable_sort_spill=true,enable_agg_spill=true,enable_force_spill=false,data_queue_max_blocks=1,spill_streaming_agg_mem_limit=268435456,external_agg_partition_bits=5) */ * from var_nested where v['k2'] = 'some' order by k limit 10"""
+        qt_sql """select * from var_nested where v['k2'] = 'some' order by k limit 10"""
         qt_sql """select * from var_nested where v['k2'] = 'some'  and array_contains(cast(v['nested1']['nested2']['a'] as array<tinyint>), 10) order by k limit 1;"""
 
         sql """INSERT INTO var_nested SELECT *, '{"k1":1, "k2": "some", "k3" : [1234], "k4" : 1.10000, "k5" : [[123]], "nested1" : {"nested2" : [{"a" : 10, "b" : 1.1, "c" : "1111"}]}}' FROM numbers("number" = "4096") where number > 1024 limit 1024;"""