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alter_table_row_type: add note on compatible changes

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Mazdak Farrokhzad
2025-06-27 16:50:06 +02:00
parent c06a0df326
commit 4f689eefdf
1 changed files with 5 additions and 0 deletions
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crates/core/src/db/datastore/locking_tx_datastore/mut_tx.rs
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@@ -436,6 +436,11 @@ impl MutTxId {
/// as the update machinery should disallow any incompatible change.
/// However, for redundancy and internal soundness of the datastore,
/// the compatibility is also checked here.
///
/// A compatible change is restricted to adding variants to the tail of a sum type
/// while preserving the [`Layout`](spacetimedb_table::layout::Layout) of the row type.
/// For timer/scheduler tables, the `id` an `at` columns must not change at all.
/// All other changes, including reordering of columns, are incompatible.
pub(crate) fn alter_table_row_type(
&mut self,
table_id: TableId,