database() function under UNION ALL truncates results to 34 characters despite databases having up to 64 character names

$ db=$(printf 'a%.0s' {1..40})

$ echo $db

aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa

$ podman run -d --rm -e MYSQL_ALLOW_EMPTY_PASSWORD=1 -e MYSQL_DATABASE=$db -e MYSQL_USER=u -e MYSQL_PASSWORD=p --name m55 mariadb:5.5

1b2c0740bf664b8a3da8071bb96234a86fe8dd5f3eb6348598f5d0c2b59ede56

$ podman exec -ti m55 mysql -u u -pp  --column-type-info -e 'select database() as "database" union all select database()' $db

Field   1:  `database`

Catalog:    `def`

Database:   ``

Table:      ``

Org_table:  ``

Type:       VAR_STRING

Collation:  latin1_swedish_ci (8)

Length:     34

Max_length: 34

Decimals:   0

Flags:      

+------------------------------------+

| database                           |

+------------------------------------+

| aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa |

| aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa |

+------------------------------------+

$ podman exec -ti m55 mysql -u u -pp  --column-type-info -e 'select database()' $db

Field   1:  `database()`

Catalog:    `def`

Database:   ``

Table:      ``

Org_table:  ``

Type:       VAR_STRING

Collation:  latin1_swedish_ci (8)

Length:     34

Max_length: 40

Decimals:   31

Flags:      

+------------------------------------------+

| database()                               |

+------------------------------------------+

| aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa |

+------------------------------------------+