https://s3.amazonaws.com/clickhouse-test-reports/42778/66c179217cdfdee1ba0d4b4b577b1a62655caed0/fuzzer_astfuzzermsan//report.html

Minimal example
```sql
#!/usr/bin/clickhouse-client --queries-file

DROP TABLE IF EXISTS tab1;
DROP TABLE IF EXISTS tab2;

SET allow_suspicious_low_cardinality_types = 1;

create table tab1 (a1 Int32, b1 Int32) engine = MergeTree order by a1;
create table tab2 (a2 LowCardinality(Int32), b2 Int32) engine = MergeTree order by a2;

insert into tab1 values (1, 2);
insert into tab2 values (1, 2);

SET join_use_nulls = 1;

SELECT 1 FROM tab1 FULL OUTER JOIN tab2 ON b1 - 2 = a2 OR a1 = b2;

```
{
    if (nullable)
    {
        JoinCommon::convertColumnToNullable(column);
    }
    else
    {
        
        if (column.column)
            if (const auto * nullable_column = checkAndGetColumn<ColumnNullable>(*column.column))
                column.column = JoinCommon::filterWithBlanks(column.column, nullable_column->getNullMapColumn().getData(), true);
        JoinCommon::removeColumnNullability(column);
    }
    return std::move(column);
}
static ColumnWithTypeAndName correctNullability(ColumnWithTypeAndName && column, bool nullable, const ColumnUInt8 & negative_null_map)