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Update documentation of UpdatePlan::ephemeral_plan

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It now better reflects when it is used.
This commit is contained in:
Jussi Saurio
2025-10-14 12:18:53 +03:00
parent bc80ac1754
commit c2fe13ad4f
1 changed files with 4 additions and 1 deletions
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5
core/translate/plan.rs
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@@ -440,7 +440,10 @@ pub struct UpdatePlan {
// whether the WHERE clause is always false
pub contains_constant_false_condition: bool,
pub indexes_to_update: Vec<Arc<Index>>,
// If the table's rowid alias is used, gather all the target rowids into an ephemeral table, and then use that table as the single JoinedTable for the actual UPDATE loop.
// If the UPDATE modifies any column that is present in the key of the btree used to iterate over the table (either the table itself or an index),
// gather all the target rowids into an ephemeral table, and then use that table as the single JoinedTable for the actual UPDATE loop.
// This ensures the keys of the btree used to iterate cannot be changed during the UPDATE loop itself, ensuring all the intended rows actually get
// updated and none are skipped.
pub ephemeral_plan: Option<SelectPlan>,
// For ALTER TABLE turso-db emits appropriate DDL statement in the "updates" cell of CDC table
// This field is present only for update plan created for ALTER TABLE when CDC mode has "updates" values