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comment about bitmasks

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jussisaurio
2024-08-11 19:18:59 +03:00
parent 1130ccf203
commit 4c016b042b
1 changed files with 16 additions and 0 deletions
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16
core/translate/plan.rs
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@@ -342,6 +342,14 @@ impl Display for Operator {
}
}
/**
Returns a bitmask where each bit corresponds to a table in the `tables` vector.
If a table is referenced in the given Operator, the corresponding bit is set to 1.
Example:
if tables = [(table1, "t1"), (table2, "t2"), (table3, "t3")],
and the Operator is a join between table1 and table3,
then the return value will be (in bits): 101
*/
pub fn get_table_ref_bitmask_for_query_plan_node<'a>(
tables: &'a Vec<(Rc<BTreeTable>, String)>,
node: &'a Operator,
@@ -391,6 +399,14 @@ pub fn get_table_ref_bitmask_for_query_plan_node<'a>(
Ok(table_refs_mask)
}
/**
Returns a bitmask where each bit corresponds to a table in the `tables` vector.
If a table is referenced in the given AST expression, the corresponding bit is set to 1.
Example:
if tables = [(table1, "t1"), (table2, "t2"), (table3, "t3")],
and predicate = "t1.a = t2.b"
then the return value will be (in bits): 110
*/
pub fn get_table_ref_bitmask_for_ast_expr<'a>(
tables: &'a Vec<(Rc<BTreeTable>, String)>,
predicate: &'a ast::Expr,