Draft: Add limit to traversal_ids subquery

What does this MR do and why?

Add limit to traversal_ids subquery for namespace project finder.

Changelog: changed

Screenshots or screen recordings

Screenshots are required for UI changes, and strongly recommended for all other merge requests.

Before	After

How to set up and validate locally

Numbered steps to set up and validate the change are strongly suggested.

Query plan (for the worst case in gitlab.com )

Before	https://console.postgres.ai/gitlab/gitlab-production-tunnel-pg12/sessions/21520/commands/70045
After	https://console.postgres.ai/gitlab/gitlab-production-tunnel-pg12/sessions/21521/commands/70048

Query:

SELECT "projects"."id", "projects"."name", "projects"."path", "projects"."description", "projects"."created_at", "projects"."updated_at", "projects"."creator_id", "projects"."namespace_id", "projects"."last_activity_at", "projects"."import_url", "projects"."visibility_level", "projects"."archived", "projects"."avatar", "projects"."merge_requests_template", "projects"."star_count", "projects"."merge_requests_rebase_enabled", "projects"."import_type", "projects"."import_source", "projects"."approvals_before_merge", "projects"."reset_approvals_on_push", "projects"."merge_requests_ff_only_enabled", "projects"."issues_template", "projects"."mirror", "projects"."mirror_last_update_at", "projects"."mirror_last_successful_update_at", "projects"."mirror_user_id", "projects"."shared_runners_enabled", "projects"."runners_token", "projects"."build_allow_git_fetch", "projects"."build_timeout", "projects"."mirror_trigger_builds", "projects"."pending_delete", "projects"."public_builds", "projects"."last_repository_check_failed", "projects"."last_repository_check_at", "projects"."only_allow_merge_if_pipeline_succeeds", "projects"."has_external_issue_tracker", "projects"."repository_storage", "projects"."repository_read_only", "projects"."request_access_enabled", "projects"."has_external_wiki", "projects"."ci_config_path", "projects"."lfs_enabled", "projects"."description_html", "projects"."only_allow_merge_if_all_discussions_are_resolved", "projects"."repository_size_limit", "projects"."printing_merge_request_link_enabled", "projects"."auto_cancel_pending_pipelines", "projects"."service_desk_enabled", "projects"."cached_markdown_version", "projects"."delete_error", "projects"."last_repository_updated_at", "projects"."disable_overriding_approvers_per_merge_request", "projects"."storage_version", "projects"."resolve_outdated_diff_discussions", "projects"."remote_mirror_available_overridden", "projects"."only_mirror_protected_branches", "projects"."pull_mirror_available_overridden", "projects"."jobs_cache_index", "projects"."external_authorization_classification_label", "projects"."mirror_overwrites_diverged_branches", "projects"."pages_https_only", "projects"."external_webhook_token", "projects"."packages_enabled", "projects"."merge_requests_author_approval", "projects"."pool_repository_id", "projects"."runners_token_encrypted", "projects"."bfg_object_map", "projects"."detected_repository_languages", "projects"."merge_requests_disable_committers_approval", "projects"."require_password_to_approve", "projects"."max_pages_size", "projects"."max_artifacts_size", "projects"."pull_mirror_branch_prefix", "projects"."remove_source_branch_after_merge", "projects"."marked_for_deletion_at", "projects"."marked_for_deletion_by_user_id", "projects"."autoclose_referenced_issues", "projects"."suggestion_commit_message", "projects"."project_namespace_id", "projects"."hidden", ROUND(CAST(((SIMILARITY(COALESCE("projects"."path", ''), 'backend') * CAST('1' AS numeric)) + (SIMILARITY(COALESCE("projects"."name", ''), 'backend') * CAST('0.7' AS numeric)) + (SIMILARITY(COALESCE("projects"."description", ''), 'backend') * CAST('0.2' AS numeric))) AS numeric), 2) AS similarity
FROM "projects"
WHERE "projects"."namespace_id" IN (
  SELECT namespaces.traversal_ids[array_length(namespaces.traversal_ids, 1)] AS id
  FROM "namespaces"
  WHERE "namespaces"."type" = 'Group'
  AND (traversal_ids @> ('{6543}'))
  LIMIT 500
)
AND (("projects"."path" ILIKE '%backend%' OR "projects"."name" ILIKE '%backend%') OR "projects"."description" ILIKE '%backend%')
AND "projects"."id" IN (
  SELECT "sbom_occurrences"."project_id"
  FROM "sbom_occurrences"
  WHERE "sbom_occurrences"."component_id" = 219)
ORDER BY ROUND(CAST(((SIMILARITY(COALESCE("projects"."path", ''), 'backend') * CAST('1' AS numeric)) + (SIMILARITY(COALESCE("projects"."name", ''), 'backend') * CAST('0.7' AS numeric)) + (SIMILARITY(COALESCE("projects"."description", ''), 'backend') * CAST('0.2' AS numeric))) AS numeric), 2) DESC, "projects"."id" DESC
LIMIT 51;

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.