AttributeCode column name length validation throws wrong error message

[brosenberger]

Preconditions (*)

1. Magento Community 2.3.0

Steps to reproduce (*)

1. go to Backend, Login with admin user
2. go to Stores -> Attributes -> Product
3. add new attribute (any values), set attribute code to custom_attribute_which_has_a_to_long_code_but_less_than_255
4. click save attribute

Expected result (*)

1. product attribute saved
2. alternatively correct error message, that only 30 characters are allowed

Actual result (*)

1. product attribute is not saved
2. error message 'Attribute code "custom_attribute_which_has_a_to_long_code_but_less_than_255" is invalid. Please use only letters (a-z), numbers (0-9) or underscore(_) in this field, first character should be a letter.' is shown

Additional Information:

actual limit within the database for attribute code is varchar(255) which contradicts attribute code validation within https://github.com/magento/magento2/blob/2.3-develop/app/code/Magento/Catalog/Controller/Adminhtml/Product/Attribute/Save.php#L200 where only 30 characters are allowed as maximum

[magento-engcom-team]

Hi @brosenberger. Thank you for your report.
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@brosenberger do you confirm that you was able to reproduce the issue on vanilla Magento instance following steps to reproduce?

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• no

[brosenberger]

@magento-engcom-team give me 2.3-develop instance

[magento-engcom-team]

Hi @brosenberger. Thank you for your request. I'm working on Magento 2.3-develop instance for you

[magento-engcom-team]

Hi @brosenberger, here is your Magento instance.
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[magento-engcom-team]

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[magento-engcom-team]

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Hi @GovindaSharma. Thank you for working on this issue.
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[GovindaSharma]

@magento-engcom-team give me 2.3-develop instance

[magento-engcom-team]

Hi @GovindaSharma. Thank you for your request. I'm working on Magento 2.3-develop instance for you