chore(executor): extract explain.rs (#116 step 5)#515
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Pulls the tri-dialect EXPLAIN machinery (issue #272 / T1.10) into explain.rs (241 LOC): - `ExplainOptions` knob struct (analyze / buffers / verbose / format). - `ExplainFormat` enum (Text / Json / Yaml / Xml). - `impl ExplainOptions::to_clause` — renders `(ANALYZE, BUFFERS, FORMAT JSON)` parenthesized PG clause. - `explain_pool` — tri-dialect dispatcher that emits PG's `EXPLAIN (FORMAT ...) <stmt>`, MySQL's `EXPLAIN [ANALYZE] [FORMAT=JSON|TREE] <stmt>`, or SQLite's `EXPLAIN QUERY PLAN <stmt>`. The `QuerySet::explain` / `QuerySet::explain_on` inherent methods stay in mod.rs since they're impls on the QuerySet inherent surface; they consume `ExplainOptions` / `ExplainFormat` re-exported from the new module. mod.rs: 3852 → 3640 LOC (-212). Build clean across sqlite,tenancy litmus + all-features. 1482 lib tests pass.
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## Summary Rolls 11 PRs from \`develop\` into \`main\`. ## Features (5) - **#507** \`i18n::middleware::LocaleMiddleware\` — tower layer (cookie + Accept-Language) + documented \`Router::nest(\"/<lang>\", ...)\` pattern for URL-prefix locales. Closes #406, #424. - **#508** \`Translator::with_fallback_chain(&[...])\` — explicit fallback locale chain. Closes #425. - **#509** \`notifications::slack::webhook_callback(url)\` — Slack incoming-webhook provider for the \`broadcast\` channel. Closes #418. Also bumps \`free-disk-space\` reclaim (\`large-packages: true\`). - **#510** Notifications fix — gate the \`database\` channel behind the \`postgres\` feature so non-PG builds compile. ## Refactor: executor reorg (#116, 7 PRs) Pulled \`crates/rustango/src/sql/executor.rs\` (4830 LOC) apart into \`crates/rustango/src/sql/executor/\` with 9 sibling files. - **#511** Mount as dir. - **#512** \`page.rs\` + \`iter.rs\` + \`get_or_create.rs\`. - **#513** \`values.rs\` (Django \`.values()\` / \`.values_list()\`). - **#514** \`atomic.rs\` (\`transaction.atomic\` + \`on_commit\`) + \`tx.rs\` (\`PoolTx\`). - **#515** \`explain.rs\` (tri-dialect \`EXPLAIN\`). - **#516** \`prefetch.rs\` (tri-dialect \`_pool\` prefetch). - **#517** \`row_to_json.rs\` (per-dialect dynamic row → JSON). mod.rs is now at 2923 LOC (-1907, **-39%**). Zero public-API change throughout — every symbol still reachable from \`use rustango::sql::*\`. ## Test plan Every constituent PR landed with sqlite_litmus + sqlite_live + mysql_live + postgres_test all green. The merge itself is a no-conflict fast-forward — no new code lands beyond what's already merged into develop. Re-running CI on the merged main confirms the integration shape.
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Summary
Step 5 of the executor reorg (#116). Pulls the tri-dialect EXPLAIN machinery (#272 / T1.10) into `explain.rs` (241 LOC):
The `QuerySet::explain` / `QuerySet::explain_on` inherent methods stay in `mod.rs` since they're impls on the QuerySet surface; they consume the re-exported types.
mod.rs: 3852 → 3640 LOC (-212). Cumulative reduction across steps 1-5: 4830 → 3640 LOC (-1190, ~25%).
Closes
#116 (partial — step 5 of 6 planned)
Test plan