[DB Schema] Cannot change column type in some cases

[Nuranto]

Summary

Changing a column type when old type uses length, and new one doesn't is currently impossible.

Examples

This :

<?xml version="1.0"?>
<schema xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
        xsi:noNamespaceSchemaLocation="urn:magento:framework:Setup/Declaration/Schema/etc/schema.xsd">
    
    <table name="eav_attribute">
        <column xsi:type="text" name="note" nullable="true" comment="Note"/>
    </table>

</schema>

will give Element 'column', attribute 'length': The attribute 'length' is not allowed. error

Proposed solution

This error has already been reported here : #26155
But the fix was to change the original type, instead of fixing the issue. However, I won't complain of such solution for my case :)

Release note

No response

Triage and priority

• Severity: S0 - Affects critical data or functionality and leaves users without workaround.
• Severity: S1 - Affects critical data or functionality and forces users to employ a workaround.
• Severity: S2 - Affects non-critical data or functionality and forces users to employ a workaround.
• Severity: S3 - Affects non-critical data or functionality and does not force users to employ a workaround.
• Severity: S4 - Affects aesthetics, professional look and feel, “quality” or “usability”.

[m2-assistant]

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[m2-assistant]

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[engcom-November]

Hello @Nuranto,

Thank you for the report and collaboration!

Verified this on 2.4-develop.
When trying to generate whitelist for the given db_schema throwed the below error:

Element 'column', attribute 'length': The attribute 'length' is not allowed.

Hence confirming this issue.

[github-jira-sync-bot]

✅ Jira issue https://jira.corp.adobe.com/browse/AC-12169 is successfully created for this GitHub issue.

[m2-assistant]

✅ Confirmed by @engcom-November. Thank you for verifying the issue.
Issue Available: @engcom-November, You will be automatically unassigned. Contributors/Maintainers can claim this issue to continue. To reclaim and continue work, reassign the ticket to yourself.

[raghuiamsingh]

when can we expect a fix for this?