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refactor(router, graphql-tools): Improve validation of operations - #1287

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kamil-validations
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refactor(router, graphql-tools): Improve validation of operations#1287
dotansimha merged 9 commits into
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kamil-validations

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@kamilkisiela

@kamilkisiela kamilkisiela commented Jul 17, 2026 •
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Validation rules now use OperationVisitor and run together during a single visit of the operation document. Previously, every rule visited the operation. I benchmarked it and it's 2-3x faster.

We now keep input object fields in a list instead of a map, so duplicate field names are not removed before validation. Previously, this query { field(input: { value: 1, value: 2 }) } was not rejected.

I also added the missing UniqueInputFieldNames rule.

I Improved VariablesInAllowedPosition so it correctly handles default values defined on variables, field arguments and input object fields. Validation was incorrectly rejecting nullable variables used in non-null argument that define a default value.

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kamilkisiela commented Jul 17, 2026
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Comment thread bin/router/src/pipeline/validation/max_aliases_rule.rs
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Comment thread bin/router/src/pipeline/validation/max_aliases_rule.rs
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Comment thread bin/router/src/pipeline/validation/max_aliases_rule.rs
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Code Review

This pull request refactors the GraphQL operation validation framework to use a visitor-based pattern, enabling multiple validation rules to run in a single document pass. It also changes the representation of GraphQL input objects (Value::Object) from BTreeMap to Vec to preserve order and introduces a new UniqueInputFieldNames validation rule. The review feedback points out a correctness bug in the Value::Object comparison logic when duplicate keys are present, and suggests performance and idiomatic improvements, such as avoiding key/value cloning in OperationVisitorContext, using a Vec instead of a HashSet for uniqueness checks on small collections, and passing slices (&[T]) instead of &Vec<T>.

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Comment thread lib/graphql-tools/src/ast/ext.rs
Comment thread lib/graphql-tools/src/ast/operation_visitor.rs Outdated
Comment thread lib/graphql-tools/src/validation/rules/unique_input_field_names.rs
Comment thread lib/graphql-tools/src/validation/rules/variables_in_allowed_position.rs Outdated
kamilkisiela
kamilkisiela commented Jul 17, 2026
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Comment thread bin/router/src/pipeline/validation/max_aliases_rule.rs
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Comment thread lib/graphql-tools/src/ast/ext.rs Outdated
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kamilkisiela commented Jul 17, 2026
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Comment thread lib/graphql-tools/src/ast/operation_visitor.rs
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Comment thread lib/graphql-tools/src/parser/common.rs
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Comment thread lib/graphql-tools/src/validation/rules/defaults.rs
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Comment thread lib/graphql-tools/src/validation/rules/leaf_field_selections.rs
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Comment thread lib/graphql-tools/src/validation/rules/rule.rs
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Comment thread lib/graphql-tools/src/validation/rules/unique_input_field_names.rs
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Comment thread lib/graphql-tools/src/validation/test_utils.rs
kamilkisiela
kamilkisiela commented Jul 17, 2026
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Comment thread lib/query-planner/src/ast/arguments.rs
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@kamilkisiela
kamilkisiela marked this pull request as ready for review July 17, 2026 11:41
dotansimha
dotansimha approved these changes Jul 19, 2026
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Amazing, thanks @kamilkisiela

@dotansimha dotansimha changed the title Improve validation of operations refactor(router, graphql-tools): Improve validation of operations Jul 19, 2026
@dotansimha
dotansimha merged commit 35840e4 into main Jul 19, 2026
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@dotansimha
dotansimha deleted the kamil-validations branch July 19, 2026 07:39
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@dotansimha dotansimha dotansimha approved these changes
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