ClickHouse/tests/queries/0_stateless/02128_cast_nullable.sql

-- { echo }
SELECT toUInt32OrDefault(toNullable(toUInt32(1))) SETTINGS cast_keep_nullable=1;
SELECT toUInt32OrDefault(toNullable(toUInt32(1)), toNullable(toUInt32(2))) SETTINGS cast_keep_nullable=1;
SELECT toUInt32OrDefault(toUInt32(1)) SETTINGS cast_keep_nullable=1;
SELECT toUInt32OrDefault(toUInt32(1), toUInt32(2)) SETTINGS cast_keep_nullable=1;
Fix CAST from Nullable with cast_keep_nullable UBsan report [1]: SELECT toUInt32OrDefault(toNullable(0)) SETTINGS cast_keep_nullable = 1 ../src/Common/assert_cast.h:50:12: runtime error: downcast of address 0x000029461170 which does not point to an object of type 'const DB::ColumnNullable' 0x000029461170: note: object is of type 'DB::ColumnVector<unsigned int>' 00 00 00 00 a0 51 3d 09 00 00 00 00 01 00 00 00 00 00 00 00 a0 3f 4e 29 00 00 00 00 a4 3f 4e 29 ^~~~~~~~~~~~~~~~~~~~~~~ vptr for 'DB::ColumnVector<unsigned int>' 0 0x1e3e279d in DB::ColumnNullable const& assert_cast<DB::ColumnNullable const&, DB::IColumn const&>(DB::IColumn const&) obj-x86_64-linux-gnu/../src/Common/assert_cast.h:50:12 1 0x1e3e279d in DB::ColumnNullable::insertRangeFrom(DB::IColumn const&, unsigned long, unsigned long) obj-x86_64-linux-gnu/../src/Columns/ColumnNullable.cpp:167:43 2 0x12db4507 in DB::FunctionCastOrDefault::executeImpl() const (/src/ch/tmp/32019/clickhouse-ubsan+0x12db4507) [1]: https://s3.amazonaws.com/clickhouse-test-reports/32019/9e1222a50b1805f696f4205e451365f8acdbc8a5/fuzzer_astfuzzerubsan,actions//report.html And w/o -fsanitize=undefined: SELECT toUInt32OrDefault(toNullable(1), toNullable(toUInt32(1))) SETTINGS cast_keep_nullable = 1 Received exception: Code: 12. DB::Exception: Parameters start = 0, length = 1 are out of bound in ColumnVector<T>::insertRangeFrom method (data.size() = 0).: While processing toUInt32OrDefault(toNullable(1), toNullable(toUInt32(1))). (PARAMETER_OUT_OF_BOUND) 2021-12-01 18:53:43 +00:00			`-- { echo }`
			`SELECT toUInt32OrDefault(toNullable(toUInt32(1))) SETTINGS cast_keep_nullable=1;`
			`SELECT toUInt32OrDefault(toNullable(toUInt32(1)), toNullable(toUInt32(2))) SETTINGS cast_keep_nullable=1;`
			`SELECT toUInt32OrDefault(toUInt32(1)) SETTINGS cast_keep_nullable=1;`
			`SELECT toUInt32OrDefault(toUInt32(1), toUInt32(2)) SETTINGS cast_keep_nullable=1;`