From 48a3a2f75c687acf2e843b517cb7a2f41b2e0bb5 Mon Sep 17 00:00:00 2001
From: Pavel Kruglov <avogar@avogar-dev.sas.yp-c.yandex.net>
Date: Fri, 17 Sep 2021 16:11:44 +0300
Subject: [PATCH 1/5] Fix segfault in Avro with LowCardinality(Nullable)

---
 .../Formats/Impl/AvroRowInputFormat.cpp       |   17 +-
 ...543_avro_deserialization_with_lc.reference | 2010 +++++++++++++++++
 .../01543_avro_deserialization_with_lc.sh     |   18 +-
 3 files changed, 2042 insertions(+), 3 deletions(-)

diff --git a/src/Processors/Formats/Impl/AvroRowInputFormat.cpp b/src/Processors/Formats/Impl/AvroRowInputFormat.cpp
index 231edffa3da3..239f238ec8e6 100644
--- a/src/Processors/Formats/Impl/AvroRowInputFormat.cpp
+++ b/src/Processors/Formats/Impl/AvroRowInputFormat.cpp
@@ -35,6 +35,7 @@
 #include <Columns/ColumnNullable.h>
 #include <Columns/ColumnString.h>
 #include <Columns/ColumnsNumber.h>
+#include <Columns/ColumnLowCardinality.h>
 
 #include <avro/Compiler.hh>
 #include <avro/DataFile.hh>
@@ -178,7 +179,21 @@ static std::string nodeName(avro::NodePtr node)
 
 AvroDeserializer::DeserializeFn AvroDeserializer::createDeserializeFn(avro::NodePtr root_node, DataTypePtr target_type)
 {
-    const WhichDataType target = removeLowCardinality(target_type);
+    if (target_type->lowCardinality())
+    {
+        const auto * lc_type = assert_cast<const DataTypeLowCardinality *>(target_type.get());
+        auto dict_deserialize = createDeserializeFn(root_node, lc_type->getDictionaryType());
+        return [dict_deserialize](IColumn & column, avro::Decoder & decoder)
+        {
+
+            auto & lc_column = assert_cast<ColumnLowCardinality &>(column);
+            auto tmp_column = lc_column.getDictionary().getNestedColumn()->cloneEmpty();
+            dict_deserialize(*tmp_column, decoder);
+            lc_column.insertFromFullColumn(*tmp_column, 0);
+        };
+    }
+
+    const WhichDataType target = WhichDataType(target_type);
 
     switch (root_node->type())
     {
diff --git a/tests/queries/0_stateless/01543_avro_deserialization_with_lc.reference b/tests/queries/0_stateless/01543_avro_deserialization_with_lc.reference
index e69de29bb2d1..2438815cd41f 100644
--- a/tests/queries/0_stateless/01543_avro_deserialization_with_lc.reference
+++ b/tests/queries/0_stateless/01543_avro_deserialization_with_lc.reference
@@ -0,0 +1,2010 @@
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+9
diff --git a/tests/queries/0_stateless/01543_avro_deserialization_with_lc.sh b/tests/queries/0_stateless/01543_avro_deserialization_with_lc.sh
index 6dea9f30db34..0b8699fb5948 100755
--- a/tests/queries/0_stateless/01543_avro_deserialization_with_lc.sh
+++ b/tests/queries/0_stateless/01543_avro_deserialization_with_lc.sh
@@ -5,10 +5,24 @@ CURDIR=$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)
 # shellcheck source=../shell_config.sh
 . "$CURDIR"/../shell_config.sh
 
-$CLICKHOUSE_CLIENT --query "CREATE TABLE IF NOT EXISTS test_01543 (value LowCardinality(String)) ENGINE=Memory()"
-$CLICKHOUSE_CLIENT --query "INSERT INTO test_01543 SELECT toString(number) FROM numbers(1000)"
+USER_FILES_PATH=$(clickhouse-client --query "select _path,_file from file('nonexist.txt', 'CSV', 'val1 char')" 2>&1 | grep Exception | awk '{gsub("/nonexist.txt","",$9); print $9}')
+
+$CLICKHOUSE_CLIENT --multiquery --query "
+SET allow_suspicious_low_cardinality_types=1;
+CREATE TABLE IF NOT EXISTS test_01543 (value LowCardinality(String), value2 LowCardinality(UInt64)) ENGINE=Memory();
+"
+
+$CLICKHOUSE_CLIENT --query "INSERT INTO test_01543 SELECT toString(number), number FROM numbers(1000)"
 
 $CLICKHOUSE_CLIENT -q "SELECT * FROM test_01543 FORMAT Avro" |
     $CLICKHOUSE_CLIENT -q "INSERT INTO test_01543 FORMAT Avro";
 
+$CLICKHOUSE_CLIENT -q "SELECT * FROM test_01543";
+
 $CLICKHOUSE_CLIENT --query "DROP TABLE IF EXISTS test_01543"
+
+$CLICKHOUSE_CLIENT --query "SELECT number % 2 ? number: NULL as x from numbers(10) FORMAT Avro" > $USER_FILES_PATH/test_01543.avro
+
+$CLICKHOUSE_CLIENT --query "SELECT * FROM file('test_01543.avro', 'Avro', 'x LowCardinality(Nullable(UInt64))')"
+
+rm $USER_FILES_PATH/test_01543.avro

From 7bf13c48915777e3bf1c58c0c3a6f49e25e76920 Mon Sep 17 00:00:00 2001
From: Pavel Kruglov <avogar@avogar-dev.sas.yp-c.yandex.net>
Date: Fri, 17 Sep 2021 16:13:15 +0300
Subject: [PATCH 2/5] Remove extra space

---
 src/Processors/Formats/Impl/AvroRowInputFormat.cpp | 1 -
 1 file changed, 1 deletion(-)

diff --git a/src/Processors/Formats/Impl/AvroRowInputFormat.cpp b/src/Processors/Formats/Impl/AvroRowInputFormat.cpp
index 239f238ec8e6..d5aab5da74a5 100644
--- a/src/Processors/Formats/Impl/AvroRowInputFormat.cpp
+++ b/src/Processors/Formats/Impl/AvroRowInputFormat.cpp
@@ -185,7 +185,6 @@ AvroDeserializer::DeserializeFn AvroDeserializer::createDeserializeFn(avro::Node
         auto dict_deserialize = createDeserializeFn(root_node, lc_type->getDictionaryType());
         return [dict_deserialize](IColumn & column, avro::Decoder & decoder)
         {
-
             auto & lc_column = assert_cast<ColumnLowCardinality &>(column);
             auto tmp_column = lc_column.getDictionary().getNestedColumn()->cloneEmpty();
             dict_deserialize(*tmp_column, decoder);

From fe79db79afb58455ff4ce4c8666caea62dd862b5 Mon Sep 17 00:00:00 2001
From: Pavel Kruglov <avogar@avogar-dev.sas.yp-c.yandex.net>
Date: Fri, 17 Sep 2021 16:14:33 +0300
Subject: [PATCH 3/5] Change test

---
 ...543_avro_deserialization_with_lc.reference | 1980 -----------------
 .../01543_avro_deserialization_with_lc.sh     |    2 +-
 tests/queries/0_stateless/grep                |    0
 3 files changed, 1 insertion(+), 1981 deletions(-)
 create mode 100644 tests/queries/0_stateless/grep

diff --git a/tests/queries/0_stateless/01543_avro_deserialization_with_lc.reference b/tests/queries/0_stateless/01543_avro_deserialization_with_lc.reference
index 2438815cd41f..8d99d88ca14d 100644
--- a/tests/queries/0_stateless/01543_avro_deserialization_with_lc.reference
+++ b/tests/queries/0_stateless/01543_avro_deserialization_with_lc.reference
@@ -8,996 +8,6 @@
 7	7
 8	8
 9	9
-10	10
-11	11
-12	12
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-14	14
-15	15
-16	16
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-21	21
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-586	586
-587	587
-588	588
-589	589
-590	590
-591	591
-592	592
-593	593
-594	594
-595	595
-596	596
-597	597
-598	598
-599	599
-600	600
-601	601
-602	602
-603	603
-604	604
-605	605
-606	606
-607	607
-608	608
-609	609
-610	610
-611	611
-612	612
-613	613
-614	614
-615	615
-616	616
-617	617
-618	618
-619	619
-620	620
-621	621
-622	622
-623	623
-624	624
-625	625
-626	626
-627	627
-628	628
-629	629
-630	630
-631	631
-632	632
-633	633
-634	634
-635	635
-636	636
-637	637
-638	638
-639	639
-640	640
-641	641
-642	642
-643	643
-644	644
-645	645
-646	646
-647	647
-648	648
-649	649
-650	650
-651	651
-652	652
-653	653
-654	654
-655	655
-656	656
-657	657
-658	658
-659	659
-660	660
-661	661
-662	662
-663	663
-664	664
-665	665
-666	666
-667	667
-668	668
-669	669
-670	670
-671	671
-672	672
-673	673
-674	674
-675	675
-676	676
-677	677
-678	678
-679	679
-680	680
-681	681
-682	682
-683	683
-684	684
-685	685
-686	686
-687	687
-688	688
-689	689
-690	690
-691	691
-692	692
-693	693
-694	694
-695	695
-696	696
-697	697
-698	698
-699	699
-700	700
-701	701
-702	702
-703	703
-704	704
-705	705
-706	706
-707	707
-708	708
-709	709
-710	710
-711	711
-712	712
-713	713
-714	714
-715	715
-716	716
-717	717
-718	718
-719	719
-720	720
-721	721
-722	722
-723	723
-724	724
-725	725
-726	726
-727	727
-728	728
-729	729
-730	730
-731	731
-732	732
-733	733
-734	734
-735	735
-736	736
-737	737
-738	738
-739	739
-740	740
-741	741
-742	742
-743	743
-744	744
-745	745
-746	746
-747	747
-748	748
-749	749
-750	750
-751	751
-752	752
-753	753
-754	754
-755	755
-756	756
-757	757
-758	758
-759	759
-760	760
-761	761
-762	762
-763	763
-764	764
-765	765
-766	766
-767	767
-768	768
-769	769
-770	770
-771	771
-772	772
-773	773
-774	774
-775	775
-776	776
-777	777
-778	778
-779	779
-780	780
-781	781
-782	782
-783	783
-784	784
-785	785
-786	786
-787	787
-788	788
-789	789
-790	790
-791	791
-792	792
-793	793
-794	794
-795	795
-796	796
-797	797
-798	798
-799	799
-800	800
-801	801
-802	802
-803	803
-804	804
-805	805
-806	806
-807	807
-808	808
-809	809
-810	810
-811	811
-812	812
-813	813
-814	814
-815	815
-816	816
-817	817
-818	818
-819	819
-820	820
-821	821
-822	822
-823	823
-824	824
-825	825
-826	826
-827	827
-828	828
-829	829
-830	830
-831	831
-832	832
-833	833
-834	834
-835	835
-836	836
-837	837
-838	838
-839	839
-840	840
-841	841
-842	842
-843	843
-844	844
-845	845
-846	846
-847	847
-848	848
-849	849
-850	850
-851	851
-852	852
-853	853
-854	854
-855	855
-856	856
-857	857
-858	858
-859	859
-860	860
-861	861
-862	862
-863	863
-864	864
-865	865
-866	866
-867	867
-868	868
-869	869
-870	870
-871	871
-872	872
-873	873
-874	874
-875	875
-876	876
-877	877
-878	878
-879	879
-880	880
-881	881
-882	882
-883	883
-884	884
-885	885
-886	886
-887	887
-888	888
-889	889
-890	890
-891	891
-892	892
-893	893
-894	894
-895	895
-896	896
-897	897
-898	898
-899	899
-900	900
-901	901
-902	902
-903	903
-904	904
-905	905
-906	906
-907	907
-908	908
-909	909
-910	910
-911	911
-912	912
-913	913
-914	914
-915	915
-916	916
-917	917
-918	918
-919	919
-920	920
-921	921
-922	922
-923	923
-924	924
-925	925
-926	926
-927	927
-928	928
-929	929
-930	930
-931	931
-932	932
-933	933
-934	934
-935	935
-936	936
-937	937
-938	938
-939	939
-940	940
-941	941
-942	942
-943	943
-944	944
-945	945
-946	946
-947	947
-948	948
-949	949
-950	950
-951	951
-952	952
-953	953
-954	954
-955	955
-956	956
-957	957
-958	958
-959	959
-960	960
-961	961
-962	962
-963	963
-964	964
-965	965
-966	966
-967	967
-968	968
-969	969
-970	970
-971	971
-972	972
-973	973
-974	974
-975	975
-976	976
-977	977
-978	978
-979	979
-980	980
-981	981
-982	982
-983	983
-984	984
-985	985
-986	986
-987	987
-988	988
-989	989
-990	990
-991	991
-992	992
-993	993
-994	994
-995	995
-996	996
-997	997
-998	998
-999	999
 \N
 1
 \N
diff --git a/tests/queries/0_stateless/01543_avro_deserialization_with_lc.sh b/tests/queries/0_stateless/01543_avro_deserialization_with_lc.sh
index 0b8699fb5948..3db80e6a7ca0 100755
--- a/tests/queries/0_stateless/01543_avro_deserialization_with_lc.sh
+++ b/tests/queries/0_stateless/01543_avro_deserialization_with_lc.sh
@@ -12,7 +12,7 @@ SET allow_suspicious_low_cardinality_types=1;
 CREATE TABLE IF NOT EXISTS test_01543 (value LowCardinality(String), value2 LowCardinality(UInt64)) ENGINE=Memory();
 "
 
-$CLICKHOUSE_CLIENT --query "INSERT INTO test_01543 SELECT toString(number), number FROM numbers(1000)"
+$CLICKHOUSE_CLIENT --query "INSERT INTO test_01543 SELECT toString(number), number FROM numbers(10)"
 
 $CLICKHOUSE_CLIENT -q "SELECT * FROM test_01543 FORMAT Avro" |
     $CLICKHOUSE_CLIENT -q "INSERT INTO test_01543 FORMAT Avro";
diff --git a/tests/queries/0_stateless/grep b/tests/queries/0_stateless/grep
new file mode 100644
index 000000000000..e69de29bb2d1

From 5ab8d5beda043ee5afbf8859ba17e179d6936845 Mon Sep 17 00:00:00 2001
From: Kruglov Pavel <48961922+Avogar@users.noreply.github.com>
Date: Fri, 17 Sep 2021 23:52:28 +0300
Subject: [PATCH 4/5] Delete grep

---
 tests/queries/0_stateless/grep | 0
 1 file changed, 0 insertions(+), 0 deletions(-)
 delete mode 100644 tests/queries/0_stateless/grep

diff --git a/tests/queries/0_stateless/grep b/tests/queries/0_stateless/grep
deleted file mode 100644
index e69de29bb2d1..000000000000

From 9fb73af891e5cb3324808ce619242c9e83bade5f Mon Sep 17 00:00:00 2001
From: Kruglov Pavel <48961922+Avogar@users.noreply.github.com>
Date: Fri, 17 Sep 2021 23:54:09 +0300
Subject: [PATCH 5/5] Mark test as no-parallel

---
 tests/queries/0_stateless/01543_avro_deserialization_with_lc.sh | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tests/queries/0_stateless/01543_avro_deserialization_with_lc.sh b/tests/queries/0_stateless/01543_avro_deserialization_with_lc.sh
index 3db80e6a7ca0..0e987c66512f 100755
--- a/tests/queries/0_stateless/01543_avro_deserialization_with_lc.sh
+++ b/tests/queries/0_stateless/01543_avro_deserialization_with_lc.sh
@@ -1,5 +1,5 @@
 #!/usr/bin/env bash
-# Tags: no-unbundled, no-fasttest
+# Tags: no-unbundled, no-fasttest, no-parallel
 
 CURDIR=$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)
 # shellcheck source=../shell_config.sh