Nullable(Enum('A'=1,'B'=2))::String Error Unexpected value 0 in enum

[UnamedRus]

Does it reproduce on recent release?

Yes, 23.6

How to reproduce

SELECT CAST(materialize(CAST(NULL, 'Nullable(Enum(\'A\' = 1, \'B\' = 2))')), 'Nullable(String)')




0 rows in set. Elapsed: 0.002 sec.

Received exception:
Code: 36. DB::Exception: Unexpected value 0 in enum: while executing 'FUNCTION CAST(materialize(CAST(NULL, 'Nullable(Enum(\'A\' = 1, \'B\' = 2))')) :: 2, 'Nullable(String)' :: 1) -> CAST(materialize(CAST(NULL, 'Nullable(Enum(\'A\' = 1, \'B\' = 2))')), 'Nullable(String)') Nullable(String) : 0'. (BAD_ARGUMENTS)

Expected behavior

Query works

Additional context
WA

SELECT CAST(materialize(CAST(NULL, 'Nullable(Enum(\'\' = 0, \'A\' = 1, \'B\' = 2))')), 'Nullable(String)')

Query id: 6b25086b-39da-4344-8743-f8c3edfda2ab

┌─CAST(materialize(CAST(NULL, 'Nullable(Enum(\'\' = 0, \'A\' = 1, \'B\' = 2))')), 'Nullable(String)')─┐
│ ᴺᵁᴸᴸ                                                                                                │
└─────────────────────────────────────────────────────────────────────────────────────────────────────┘