Preserve foreign key constraints when changing a column's type #232
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exekias
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Allow `Duplicator` to duplicate a column but with a different type.
Ensure that changing a column's type preserves any foreign keys defined on the column.
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Preserve any foreign key constraints defined on columns when changing a column's type.
Uses the
Duplicatortype added in #230 in the 'change type' operation to ensure that FK constraints are preserved when the column is duplicated for backfilling.#230 did the same thing for preserving FK constraints when a column has a
NOT NULLconstraint added.Part of #227