**Describe the bug**
```
5828589:2021.04.27 03:13:08.824665 [ 6101 ] {} <Trace> test_27.concurrent_alter_add_drop_3 (825021f7-129f-4841-ad6b-92215e3f1a94): Renaming temporary part tmp_merge_all_0_4_7_17 to all_0_4_7_17.
5828590:2021.04.27 03:13:08.824778 [ 3358 ] {} <Trace> test_27.concurrent_alter_add_drop_2 (f0a064d0-dc89-4710-9781-a49bb0c16461): Renaming temporary part tmp_merge_all_0_4_7_17 to all_0_4_7_17.
5828591:2021.04.27 03:13:08.824823 [ 6101 ] {} <Warning> test_27.concurrent_alter_add_drop_3 (825021f7-129f-4841-ad6b-92215e3f1a94): Tried to add obsolete part all_0_4_7_17 covered by all_0_4_13_34 (state Committed)
5828623:2021.04.27 03:13:08.824951 [ 3358 ] {} <Warning> test_27.concurrent_alter_add_drop_2 (f0a064d0-dc89-4710-9781-a49bb0c16461): Tried to add obsolete part all_0_4_7_17 covered by all_0_4_13_34 (state Committed)
5828624:2021.04.27 03:13:08.824995 [ 6101 ] {} <Warning> test_27.concurrent_alter_add_drop_3 (825021f7-129f-4841-ad6b-92215e3f1a94) (MergerMutator): Unexpected number of parts removed when adding all_0_4_7_17: 0 instead of 1
5828625:2021.04.27 03:13:08.825147 [ 3358 ] {} <Warning> test_27.concurrent_alter_add_drop_2 (f0a064d0-dc89-4710-9781-a49bb0c16461) (MergerMutator): Unexpected number of parts removed when adding all_0_4_7_17: 0 instead of 1
5828643:2021.04.27 03:13:08.831273 [ 3358 ] {} <Trace> test_27.concurrent_alter_add_drop_2 (f0a064d0-dc89-4710-9781-a49bb0c16461): Trying to immediately remove part all_0_4_7_17 (state Temporary)
5828644:2021.04.27 03:13:08.831658 [ 3358 ] {} <Fatal> : Logical error: 'Part all_0_4_7_17 doesn't exist'.
5828648:2021.04.27 03:13:08.832767 [ 6101 ] {} <Trace> test_27.concurrent_alter_add_drop_3 (825021f7-129f-4841-ad6b-92215e3f1a94): Trying to immediately remove part all_0_4_7_17 (state Temporary)
5828649:2021.04.27 03:13:08.833210 [ 6101 ] {} <Fatal> : Logical error: 'Part all_0_4_7_17 doesn't exist'.

```

https://clickhouse-test-reports.s3.yandex.net/0/9bb4d8769f1064ada4cce6b26d8ff61c11356965/stress_test_(debug).html#fail1
if (partition_ast.fields_count != fields_count)
        throw Exception(
            "Wrong number of fields in the partition expression: " + toString(partition_ast.fields_count) +
            ", must be: " + toString(fields_count),
            ErrorCodes::INVALID_PARTITION_VALUE);
    if (auto * f = partition_ast.value->as<ASTFunction>())
    {
        assert(f->name == "tuple");
        if (f->arguments && !f->arguments->as<ASTExpressionList>()->children.empty())
        {
            ASTPtr query = partition_ast.value->clone();
            auto syntax_analyzer_result
                = TreeRewriter(local_context)
                      .analyze(query, metadata_snapshot->getPartitionKey().sample_block.getNamesAndTypesList(), {}, {}, false, false);
            auto actions = ExpressionAnalyzer(query, syntax_analyzer_result, local_context).getActions(true);
            if (actions->hasArrayJoin())
                throw Exception("The partition expression cannot contain array joins", ErrorCodes::INVALID_PARTITION_VALUE);
        }
    }
    const FormatSettings format_settings;
    Row partition_row(fields_count);
    if (fields_count)
    {
        ReadBufferFromMemory left_paren_buf("(", 1);
        ReadBufferFromMemory fields_buf(partition_ast.fields_str.data(), partition_ast.fields_str.size());
        ReadBufferFromMemory right_paren_buf(")", 1);
        ConcatReadBuffer buf({&left_paren_buf, &fields_buf, &right_paren_buf});
        auto input_format = FormatFactory::instance().getInput(
            "Values",
            buf,