Commits on Nov 15, 2024

1. sql/schemachanger: Enable column type changes for virtual computed co… …

   …lumns
   
   This update introduces support for altering the column type of virtual
   computed columns in the declarative schema changer (DSC). Previously,
   such operations were not allowed.
   
   A key characteristic of virtual columns is that type changes never
   require a backfill or column rewrite, as their values are computed
   dynamically during access. This change includes adjustments to handle
   type changes that would typically involve a rewrite as simple metadata
   updates instead.
   
   Additionally, the USING expression in ALTER TABLE statements is now
   explicitly disallowed for virtual columns, as no data rewriting occurs.
   Attempts to use this option will result in an error.
   
   Epic: CRDB-25314
   Closes: cockroachdb#125840
   Release note: none

   

   spilchen committed Nov 15, 2024
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