* feat(core): implement PIP-0001 database connection timeout recovery
- Add DbOperationBudget struct for unified execution budget model
- Add deadpool create/recycle timeout for PostgreSQL pools
- Add checkout_postgres_client helper replacing 14 bare pool.get() calls
with timeout + cancel token support
- Fix PostgreSQL TLS cancel: rebuild TLS connector from stored context,
fallback to NoTls on failure
- Add timeout to MySQL kill_query and kill_query_with_opts (5s)
- Extend is_connection_error to match deadpool pool timeout messages
- Unify keepalive default to 30s (was 60s Rust / 0s frontend mismatch)
- Inject PostgreSQL TCP keepalive params (idle=30s, interval=10s, retries=3)
- Inject MySQL tcp_keepalive=30s in OptsBuilder
- Make MySQL inactive_connection_ttl configurable from idle_timeout_secs
- Add stage-based structured logging for pool.checkout/health.check/cancel
- Store PostgresCancelContext in AppState for TLS cancel reconstruction
- Clean up cancel contexts on pool removal/drain
- Add unit tests for DbOperationBudget and pool timeout error detection
* fix(core): align timeout recovery with PIP-0001
* fix(core): handle timeout recovery review issues
* fix(core): complete connection timeout recovery
* fix(core): fall back postgres cancel connector build
* refactor: revert comment translations to English in connection.rs and query.rs
- Revert DbOperationBudget doc comments to English (query.rs)
- Revert PostgresCancelContext and TLS cancel comments to English (connection.rs)
- Keep Chinese error-matching strings in is_connection_error unchanged
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Co-authored-by: onceMisery <onceMisery@users.noreply.github.com>
Problem: When exporting DISTINCT/GROUP BY query results from distributed
databases like Doris 2.1, LIMIT/OFFSET pagination without ORDER BY causes
duplicate rows across pages because tablet scan order varies between
independent query executions.
Fix: Detect dedup queries (DISTINCT, GROUP BY, HAVING) that lack an
ORDER BY clause and automatically inject a positional ORDER BY (1, 2, ..., N)
before applying LIMIT/OFFSET. Positional references work correctly with
aliases, expressions, CASE WHEN, subqueries, and aggregate functions.
Changes:
- Add dedup_projection_count_without_order_by() using sqlparser to detect
dedup queries and count projection columns
- Add ormat_positional_order_by() to generate ORDER BY 1, 2, ..., N
- Modify dd_standard_limit() to accept dedup_projection_count and inject
ORDER BY; wrap in subquery when original query already has LIMIT
- Update dd_outer_standard_limit() to accept an order_sql parameter
- Add 20 unit tests covering Doris, MySQL, PostgreSQL, aliases, expressions,
subqueries, GROUP BY, UNION, and existing ORDER BY scenarios
All 1203 tests pass (61 in query_result_sql, 11 in query_result_export).
* docs: add query result streaming export design
* feat(core): stream query result exports
* feat: expose query result streaming export APIs
* feat(desktop): stream query result exports from grid
* fix: route query result export cancellation through its command
* fix: reduce query export batch size and cancel latency
* opt: del local test files
miracle