AI Assistant: adjust filterValue schema for gemini

[anna-shakhova]

No description provided.

[anna-shakhova]

The node id lives on this wrapper, not inside the expr union. Azure OpenAI's strict structured-output mode rejects an anyOf whose object branches share an identical property (the variants would all carry id: string); keeping id out of the union leaves the branches sharing only their type discriminator.

[Copilot]

Pull request overview

Adjusts the filterValueCommand Zod schema used by the grid AI assistant so it works with structured-output providers (notably Gemini) that don't support recursive schemas. The previous recursive expression form (using nested left/right/expression) is replaced with a flat node-list tree ({ rootId, nodes } where nodes reference each other by id), and a new converter walks the node graph to produce the existing legacy filterValue array consumed by the grid. Tests are updated and expanded accordingly.

Changes:

• Replaced the recursive z.lazy schema with separate basic/combined/negated variants that reference other nodes by id, plus a FilterExprTree wrapper.
• Added a convertFilterExprToArray implementation that validates uniqueness, missing references, and cycles, and updated the command description to instruct the model in the new format.
• Refactored existing filtering tests around new basicNode/combinedNode/negatedNode/tree helpers and added coverage for empty nodes, strictness, duplicate ids, missing rootId/refs, cycles, and unreachable nodes.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
packages/devextreme/js/__internal/grids/grid_core/ai_assistant/commands/filtering.ts	Switches filterValueCommand to a flat node-list schema and adds an id-resolving converter to the legacy array form.
packages/devextreme/js/__internal/grids/grid_core/ai_assistant/commands/__tests__/filtering.test.ts	Rewrites helpers/tests for the new tree shape and adds converter-failure tests (duplicate id, missing refs, cycle, unreachable nodes).