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e9bf92e987
The `/introspect` endpoint showed poor performance during v4 load
testing due to an inefficient database query in
`internal/query/introspection_client_by_id.sql`. This PR optimizes the
query structure to significantly improve performance.
## Query Optimizations
**UNION → UNION ALL**: Changed expensive `UNION` to `UNION ALL` since
`client_id` is unique across both API and OIDC config tables,
eliminating unnecessary deduplication overhead (30-50% improvement
expected).
**Simplified Keys CTE**: Optimized the keys lookup logic by using
`$2::text as client_id` instead of `identifier as client_id` with `group
by`, and added explicit `$3 = true` condition to the LEFT JOIN for
better query planning.
**Enhanced Readability**: Added consistent table aliases (c, a, p, o, k)
for better maintainability.
## Benefits
- **Zero-downtime deployment**: Uses existing database indexes, no
schema changes required
- **Secondary performance gains**: Other similar queries
(`oidc_client_by_id.sql`, `userinfo_client_by_id.sql`) will also benefit
from the optimizations
- **Minimal code changes**: Only 13 lines added, 9 lines removed in the
SQL query
- **Backward compatible**: Same result set and API behavior
The optimized query maintains the same functionality while providing
significant performance improvements for the introspection endpoint
under high concurrent load.
Fixes #10389.
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Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: muhlemmer <5411563+muhlemmer@users.noreply.github.com>
Co-authored-by: Tim Möhlmann <tim+github@zitadel.com>
(cherry picked from commit a28950661c)