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Before
```
Evaluated relational algebra for predicate TypeInference::DeconstructionPatMatchingInput::Access.getNodeAt/1#dispred#cc149bc2@88f6f09n with tuple counts:
142521 ~1% {3} r1 = JOIN num#FunctionType::TReturnFunctionPosition#a15fd6be WITH TypeInference::DeconstructionPatMatchingInput::Access#a2676dcb CARTESIAN PRODUCT OUTPUT Rhs.0, Lhs.0, Rhs.0
131938 ~0% {3} r2 = JOIN `TupleStructPat::Generated::TupleStructPat.getField/1#dispred#ac9c1af6` WITH TypeInference::DeconstructionPatMatchingInput::Access#a2676dcb ON FIRST 1 OUTPUT Lhs.1, Lhs.0, Lhs.2
131938 ~6% {3} | JOIN WITH `FunctionType::FunctionPosition.asPosition/0#dispred#efcc0611_10#join_rhs` ON FIRST 1 OUTPUT Lhs.1, Rhs.1, Lhs.2
3071346 ~0% {2} r3 = SCAN `Name::Generated::Name.getText/0#dispred#107a5a39` OUTPUT In.1, In.0
103064442 ~2% {3} | JOIN WITH `StructPat::StructPat.getPatField/1#5e21ea0e_102#join_rhs` ON FIRST 1 OUTPUT Rhs.1, Lhs.1, Rhs.2
103064442 ~3% {3} | JOIN WITH TypeInference::DeconstructionPatMatchingInput::Access#a2676dcb ON FIRST 1 OUTPUT Lhs.2, Lhs.1, Lhs.0
103064438 ~1% {3} | JOIN WITH `StructPatField::Generated::StructPatField.getPat/0#dispred#1aadfeff` ON FIRST 1 OUTPUT Lhs.1, Lhs.2, Rhs.1
20514858 ~2% {3} | JOIN WITH `StructField::Generated::StructField.getName/0#dispred#e0248569_10#join_rhs` ON FIRST 1 OUTPUT Lhs.1, Rhs.1, Lhs.2
59554 ~1% {3} | JOIN WITH `StructPat::StructPat.getNthStructField/1#dispred#de537654_021#join_rhs` ON FIRST 2 OUTPUT Rhs.2, Lhs.0, Lhs.2
59542 ~0% {3} | JOIN WITH `FunctionType::FunctionPosition.asPosition/0#dispred#efcc0611_10#join_rhs` ON FIRST 1 OUTPUT Lhs.1, Rhs.1, Lhs.2
334001 ~0% {3} r4 = r1 UNION r2 UNION r3
return r4
Evaluated relational algebra for predicate TypeInference::ConstructionMatchingInput::Access.getNodeAt/1#dispred#acd835e6@bfb1f1e1 with tuple counts:
1395153 ~3% {3} r1 = JOIN TypeInference::ConstructionMatchingInput::PathExprAccess#b7a80c43 WITH num#FunctionType::TReturnFunctionPosition#a15fd6be CARTESIAN PRODUCT OUTPUT Lhs.0, Rhs.0, Lhs.0
34290 ~3% {3} r2 = JOIN StructExpr::Generated::StructExpr#d0a89c56 WITH num#FunctionType::TReturnFunctionPosition#a15fd6be CARTESIAN PRODUCT OUTPUT Lhs.0, Rhs.0, Lhs.0
3071346 ~0% {2} r3 = SCAN `Name::Generated::Name.getText/0#dispred#107a5a39` OUTPUT In.1, In.0
145365745 ~0% {3} | JOIN WITH `StructExpr::StructExpr.getFieldExpr/1#cd55566d_102#join_rhs` ON FIRST 1 OUTPUT Rhs.1, Lhs.1, Rhs.2
145365745 ~1% {3} | JOIN WITH StructExpr::Generated::StructExpr#d0a89c56 ON FIRST 1 OUTPUT Lhs.1, Lhs.0, Lhs.2
33371514 ~0% {3} | JOIN WITH `StructField::Generated::StructField.getName/0#dispred#e0248569_10#join_rhs` ON FIRST 1 OUTPUT Lhs.1, Rhs.1, Lhs.2
108831 ~0% {3} | JOIN WITH `StructExpr::StructExpr.getNthStructField/1#dispred#89ad7e20_021#join_rhs` ON FIRST 2 OUTPUT Rhs.2, Lhs.0, Lhs.2
108751 ~0% {3} | JOIN WITH `FunctionType::FunctionPosition.asPosition/0#dispred#efcc0611_10#join_rhs` ON FIRST 1 OUTPUT Lhs.2, Lhs.1, Rhs.1
108751 ~4% {3} | JOIN WITH `StructExprField::Generated::StructExprField.getExpr/0#dispred#956e6ba1` ON FIRST 1 OUTPUT Lhs.1, Lhs.2, Rhs.1
1748398 ~4% {3} r4 = `TypeInference::ConstructionMatchingInput::NonAssocCallAccess.getNodeAt/1#dispred#ef232b1f` UNION r1 UNION r2 UNION r3
return r4
```
After
```
Evaluated relational algebra for predicate TypeInference::DeconstructionPatMatchingInput::Access.getNodeAt/1#dispred#cc149bc2@2ea6ebjs with tuple counts:
142521 ~1% {3} r1 = JOIN num#FunctionType::TReturnFunctionPosition#a15fd6be WITH TypeInference::DeconstructionPatMatchingInput::Access#a2676dcb CARTESIAN PRODUCT OUTPUT Rhs.0, Lhs.0, Rhs.0
131938 ~0% {3} r2 = JOIN `TupleStructPat::Generated::TupleStructPat.getField/1#dispred#ac9c1af6` WITH TypeInference::DeconstructionPatMatchingInput::Access#a2676dcb ON FIRST 1 OUTPUT Lhs.1, Lhs.0, Lhs.2
131938 ~6% {3} | JOIN WITH `FunctionType::FunctionPosition.asPosition/0#dispred#efcc0611_10#join_rhs` ON FIRST 1 OUTPUT Lhs.1, Rhs.1, Lhs.2
166829 ~3% {3} r3 = JOIN `_Name::Generated::Name.getText/0#dispred#107a5a39_StructField::Generated::StructField.getName/0#disp__#shared` WITH `StructPat::StructPat.getNthStructField/1#dispred#de537654_201#join_rhs` ON FIRST 1 OUTPUT Rhs.1, Lhs.1, Rhs.2
166817 ~2% {3} | JOIN WITH TypeInference::DeconstructionPatMatchingInput::Access#a2676dcb ON FIRST 1 OUTPUT Lhs.2, Lhs.1, Lhs.0
166817 ~0% {3} | JOIN WITH `FunctionType::FunctionPosition.asPosition/0#dispred#efcc0611_10#join_rhs` ON FIRST 1 OUTPUT Lhs.2, Lhs.1, Rhs.1
59542 ~0% {3} | JOIN WITH `StructPat::StructPat.getPatField/1#5e21ea0e` ON FIRST 2 OUTPUT Rhs.2, Lhs.0, Lhs.2
59542 ~0% {3} | JOIN WITH `StructPatField::Generated::StructPatField.getPat/0#dispred#1aadfeff` ON FIRST 1 OUTPUT Lhs.1, Lhs.2, Rhs.1
334001 ~0% {3} r4 = r1 UNION r2 UNION r3
return r4
Evaluated relational algebra for predicate TypeInference::ConstructionMatchingInput::Access.getNodeAt/1#dispred#acd835e6@c7f267fp with tuple counts:
1395153 ~3% {3} r1 = JOIN TypeInference::ConstructionMatchingInput::PathExprAccess#b7a80c43 WITH num#FunctionType::TReturnFunctionPosition#a15fd6be CARTESIAN PRODUCT OUTPUT Lhs.0, Rhs.0, Lhs.0
34290 ~3% {3} r2 = JOIN StructExpr::Generated::StructExpr#d0a89c56 WITH num#FunctionType::TReturnFunctionPosition#a15fd6be CARTESIAN PRODUCT OUTPUT Lhs.0, Rhs.0, Lhs.0
159331 ~0% {3} r3 = JOIN `_Name::Generated::Name.getText/0#dispred#107a5a39_StructField::Generated::StructField.getName/0#disp__#shared` WITH `StructExpr::StructExpr.getNthStructField/1#dispred#89ad7e20_201#join_rhs` ON FIRST 1 OUTPUT Rhs.1, Lhs.1, Rhs.2
159231 ~3% {3} | JOIN WITH StructExpr::Generated::StructExpr#d0a89c56 ON FIRST 1 OUTPUT Lhs.2, Lhs.1, Lhs.0
159231 ~3% {3} | JOIN WITH `FunctionType::FunctionPosition.asPosition/0#dispred#efcc0611_10#join_rhs` ON FIRST 1 OUTPUT Lhs.2, Lhs.1, Rhs.1
108731 ~0% {3} | JOIN WITH `StructExpr::StructExpr.getFieldExpr/1#cd55566d` ON FIRST 2 OUTPUT Rhs.2, Lhs.0, Lhs.2
108731 ~4% {3} | JOIN WITH `StructExprField::Generated::StructExprField.getExpr/0#dispred#956e6ba1` ON FIRST 1 OUTPUT Lhs.1, Lhs.2, Rhs.1
1748378 ~4% {3} r4 = `TypeInference::ConstructionMatchingInput::NonAssocCallAccess.getNodeAt/1#dispred#ef232b1f` UNION r1 UNION r2 UNION r3
return r4
```
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Pull request overview
This PR is a follow-up to #21488 that improves the performance of Rust type inference by fixing two inefficient joins in getNodeAt, using pragma[only_bind_into] to steer join ordering and avoid large intermediate relations.
Changes:
- Wrap struct field-name lookup keys in
pragma[only_bind_into](...)in construction matching (StructExprAccess.getNodeAt). - Wrap struct field-name lookup keys in
pragma[only_bind_into](...)in deconstruction pattern matching (DeconstructionPatMatchingInput::Access.getNodeAt).
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#21488 follow-up.
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