feat: support explain over advanced-mode SQL queries
explain now wraps the advanced SQL commands — select, with (CTE), insert, update, delete — in addition to the DSL show data/update/ delete it already covered, rendering through the same plan tree (ADR-0039, closing the ADR-0030 OOS-2 gap). Implemented as a second Advanced `explain` CommandNode under the shared entry word, reusing the established shared-word dispatch (SQL-first, DSL-fallback) rather than new grammar machinery. build_explain_sql slices the inner SQL off the source and reuses the existing SQL builders; do_explain_plan runs EXPLAIN QUERY PLAN over the carried text verbatim (never executes, so safe for destructive verbs). Advanced explain update/delete now route through SQL with an identical plan; DSL-explain tests pinned to simple mode. Help and usage text now list the advanced explain forms.
This commit is contained in:
claude@clouddev1
+254
-5
@@ -431,6 +431,46 @@ const EXPLAIN_CHOICES: &[Node] = &[
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];
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const EXPLAIN_SHAPE: Node = Node::Choice(EXPLAIN_CHOICES);
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// --- explain over advanced-mode SQL (ADR-0039) -------------------
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//
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// The SQL inner mirrors the DSL inner above, but wraps the SQL
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// command shapes (the same nodes the standalone `SELECT` / `WITH` /
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// `SQL_*` commands use). This shape backs a *second* `explain`
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// CommandNode (`EXPLAIN_SQL`, registered `Advanced`); the registry's
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// shared-entry-word dispatch tries it first in advanced mode and
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// falls back to the `Simple` DSL `EXPLAIN` when a branch can't match
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// (e.g. `explain show data …`, or a DSL-only `--all-rows`). `select`
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// and `with` are SQL-only, so they only ever resolve here.
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const EXPLAIN_SELECT_NODES: &[Node] = &[
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Node::Word(Word::keyword("select")),
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Node::Subgrammar(&sql_select::SQL_SELECT_TAIL),
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];
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const EXPLAIN_WITH_NODES: &[Node] = &[
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Node::Word(Word::keyword("with")),
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Node::Subgrammar(&sql_select::SQL_WITH_TAIL),
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];
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const EXPLAIN_SQL_INSERT_NODES: &[Node] = &[
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Node::Word(Word::keyword("insert")),
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Node::Subgrammar(&sql_insert::SQL_INSERT_SHAPE),
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];
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const EXPLAIN_SQL_UPDATE_NODES: &[Node] = &[
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Node::Word(Word::keyword("update")),
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Node::Subgrammar(&sql_update::SQL_UPDATE_SHAPE),
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];
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const EXPLAIN_SQL_DELETE_NODES: &[Node] = &[
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Node::Word(Word::keyword("delete")),
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Node::Subgrammar(&sql_delete::SQL_DELETE_SHAPE),
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];
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const EXPLAIN_SQL_CHOICES: &[Node] = &[
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Node::Seq(EXPLAIN_SELECT_NODES),
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Node::Seq(EXPLAIN_WITH_NODES),
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Node::Seq(EXPLAIN_SQL_INSERT_NODES),
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Node::Seq(EXPLAIN_SQL_UPDATE_NODES),
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Node::Seq(EXPLAIN_SQL_DELETE_NODES),
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];
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const EXPLAIN_SQL_SHAPE: Node = Node::Choice(EXPLAIN_SQL_CHOICES);
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// =================================================================
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// select — SQL `SELECT` (advanced mode; ADR-0030 §6, ADR-0031)
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// =================================================================
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@@ -876,6 +916,48 @@ fn build_explain(path: &MatchedPath, _source: &str) -> Result<Command, Validatio
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})
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}
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/// Build `Command::Explain` over an advanced-mode SQL inner
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/// (ADR-0039). The inner SQL text is sliced from `source` starting
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/// at the inner entry keyword's span, so the carried SQL excludes
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/// the `explain` prefix — `EXPLAIN QUERY PLAN` runs over the inner
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/// statement, not the wrapper. The SQL builders extract their
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/// metadata (target table, etc.) from `path` by role, which is
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/// offset-independent, so passing the whole explain `path` is safe;
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/// only the SQL *text* needs the prefix stripped.
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fn build_explain_sql(path: &MatchedPath, source: &str) -> Result<Command, ValidationError> {
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// Words in the path: [0] is the `explain` entry word, [1] is the
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// inner entry keyword (select / with / insert / update / delete).
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let inner_item = path
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.items
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.iter()
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.filter(|i| matches!(i.kind, MatchedKind::Word(_)))
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.nth(1)
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.ok_or_else(|| ValidationError {
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message_key: "parse.error_wrapper",
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args: vec![("detail", "missing explain target".to_string())],
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})?;
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let inner_word = match &inner_item.kind {
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MatchedKind::Word(w) => *w,
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_ => unreachable!("filtered to Word above"),
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};
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let inner_source = source[inner_item.span.0..].trim();
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let inner = match inner_word {
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"select" | "with" => build_select(path, inner_source)?,
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"insert" => build_sql_insert(path, inner_source)?,
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"update" => build_sql_update(path, inner_source)?,
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"delete" => build_sql_delete(path, inner_source)?,
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_ => {
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return Err(ValidationError {
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message_key: "parse.error_wrapper",
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args: vec![("detail", "unknown explain target".to_string())],
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});
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}
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};
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Ok(Command::Explain {
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query: Box::new(inner),
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})
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}
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// =================================================================
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// replay — `replay <bare-path>` | `replay '<path>'`
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// =================================================================
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@@ -1317,6 +1399,25 @@ pub static EXPLAIN: CommandNode = CommandNode {
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help_id: Some("data.explain"),
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usage_ids: &["parse.usage.explain"],};
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/// `explain` over advanced-mode SQL (ADR-0039).
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///
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/// The `Advanced` node of the shared `explain` entry word. Pairs with
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/// the `Simple` DSL [`EXPLAIN`] node above: in advanced mode the
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/// dispatcher tries this SQL node first and falls back to the DSL node
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/// when no SQL branch matches (`explain show data …`, or a DSL-only
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/// `--all-rows`); in simple mode only the DSL node is reachable.
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pub static EXPLAIN_SQL: CommandNode = CommandNode {
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entry: Word::keyword("explain"),
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shape: EXPLAIN_SQL_SHAPE,
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ast_builder: build_explain_sql,
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// No `help_id` / `usage_ids` — this is the `Advanced` half of the
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// shared `explain` entry word, so it defers to the `Simple`
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// `EXPLAIN` node's help/usage (which now covers the SQL forms
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// too). Mirrors the `SQL_INSERT`/`SQL_UPDATE`/`SQL_DELETE`
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// precedent; otherwise `note_help` would print `explain` twice.
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help_id: None,
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usage_ids: &[],};
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/// SQL `SELECT` (ADR-0030 §6, ADR-0031, ADR-0032).
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///
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/// Advanced mode only — gated by `grammar::is_advanced_only`.
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@@ -1401,10 +1502,17 @@ mod explain_tests {
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use super::Command;
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use crate::dsl::parser::parse_command;
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/// Parse `input` and unwrap the `Command::Explain` wrapper,
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/// returning the inner command.
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/// Parse `input` in **simple** mode and unwrap the
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/// `Command::Explain` wrapper, returning the inner command.
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/// These cover the DSL-explain wrapping (ADR-0028); the
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/// advanced-mode SQL wrapping (ADR-0039) is covered by
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/// `explain_inner_adv` below. (`parse_command` defaults to
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/// advanced, where `explain update`/`delete` now route to the
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/// SQL path — so DSL-explain tests pin the mode explicitly.)
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fn explain_inner(input: &str) -> Command {
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match parse_command(input).expect("explain should parse") {
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match crate::dsl::parser::parse_command_in_mode(input, crate::mode::Mode::Simple)
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.expect("explain should parse")
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{
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Command::Explain { query } => *query,
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other => panic!("expected Command::Explain, got {other:?}"),
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}
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@@ -1450,8 +1558,15 @@ mod explain_tests {
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fn explain_of_an_incomplete_update_is_a_parse_error() {
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// A bare `update` still needs its `where` / `--all-rows`
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// (ADR-0028 §1: `explain` of an incomplete command is the
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// same parse error the command alone would be).
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assert!(parse_command("explain update Customers set Name='Bo'").is_err());
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// same parse error the command alone would be). Simple mode:
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// in advanced mode a where-less SQL UPDATE is valid (ADR-0039).
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assert!(
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crate::dsl::parser::parse_command_in_mode(
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"explain update Customers set Name='Bo'",
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crate::mode::Mode::Simple,
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)
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.is_err()
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);
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}
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#[test]
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@@ -1465,4 +1580,138 @@ mod explain_tests {
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assert!(parse_command("explain").is_err());
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assert!(parse_command("explain show").is_err());
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}
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// ---- ADR-0039: explain over advanced-mode SQL --------------
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use crate::dsl::parser::parse_command_in_mode;
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use crate::mode::Mode;
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/// Advanced-mode counterpart of `explain_inner`.
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fn explain_inner_adv(input: &str) -> Command {
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match parse_command_in_mode(input, Mode::Advanced)
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.expect("advanced explain should parse")
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{
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Command::Explain { query } => *query,
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other => panic!("expected Command::Explain, got {other:?}"),
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}
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}
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#[test]
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fn explain_select_wraps_a_select_with_clean_sql() {
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// The carried SQL must NOT include the `explain` prefix
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// (ADR-0039) — `EXPLAIN QUERY PLAN` runs over the inner SQL.
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match explain_inner_adv("explain select * from Customers") {
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Command::Select { sql } => assert_eq!(sql, "select * from Customers"),
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other => panic!("expected Select, got {other:?}"),
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}
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}
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#[test]
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fn explain_with_cte_wraps_a_select() {
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match explain_inner_adv(
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"explain with recent as (select * from Orders) select * from recent",
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) {
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Command::Select { sql } => {
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assert!(sql.starts_with("with recent"), "clean inner sql: {sql}");
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}
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other => panic!("expected Select, got {other:?}"),
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}
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}
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#[test]
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fn explain_sql_insert_wraps_a_sql_insert() {
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match explain_inner_adv("explain insert into Customers values (1, 'Bo')") {
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Command::SqlInsert { sql, target_table, .. } => {
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assert_eq!(target_table, "Customers");
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assert_eq!(sql, "insert into Customers values (1, 'Bo')");
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}
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other => panic!("expected SqlInsert, got {other:?}"),
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}
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}
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#[test]
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fn explain_sql_update_wraps_a_sql_update_with_clean_sql() {
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match explain_inner_adv("explain update Customers set Name = 'Bo' where id = 1") {
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Command::SqlUpdate { sql, target_table, .. } => {
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assert_eq!(target_table, "Customers");
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assert_eq!(sql, "update Customers set Name = 'Bo' where id = 1");
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}
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other => panic!("expected SqlUpdate, got {other:?}"),
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}
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}
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#[test]
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fn explain_sql_delete_wraps_a_sql_delete() {
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match explain_inner_adv("explain delete from Customers where id = 1") {
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Command::SqlDelete { sql, target_table, .. } => {
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assert_eq!(target_table, "Customers");
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assert_eq!(sql, "delete from Customers where id = 1");
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}
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other => panic!("expected SqlDelete, got {other:?}"),
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}
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}
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#[test]
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fn explain_update_with_all_rows_flag_falls_back_to_dsl_in_advanced() {
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// `--all-rows` is DSL-only; the SQL update shape can't
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// consume it, so the explain inner falls back to the DSL
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// `Update` node — mirroring the top-level shared-word
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// dispatch (ADR-0033).
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assert!(matches!(
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explain_inner_adv("explain update Customers set Name = 'Bo' --all-rows"),
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Command::Update { .. }
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));
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}
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#[test]
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fn explain_show_data_still_uses_dsl_in_advanced() {
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// `show data` has no SQL form; advanced `explain show data`
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// falls back to the DSL inner.
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assert!(matches!(
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explain_inner_adv("explain show data Customers"),
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Command::ShowData { .. }
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));
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}
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#[test]
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fn explain_select_is_rejected_in_simple_mode() {
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// `select` is advanced-only, so `explain select` has no
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// simple-mode form.
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assert!(parse_command_in_mode("explain select * from Customers", Mode::Simple).is_err());
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}
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#[test]
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fn explain_does_not_cover_ddl() {
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// EXPLAIN QUERY PLAN applies to DML/queries only (ADR-0039
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// out of scope); there is no SQL DDL branch under explain.
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assert!(parse_command_in_mode(
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"explain create table T (id int)",
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Mode::Advanced,
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)
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.is_err());
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}
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#[test]
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fn advanced_explain_completion_offers_the_sql_verbs() {
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// After `explain ` in advanced mode the candidate list is the
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// union across both `explain` CommandNodes: the SQL verbs
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// (select/with/insert/update/delete) plus the DSL `show`
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// (ADR-0039). The shared-entry-word completion already
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// aggregates, so there is no UX gap.
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use crate::completion::candidates_at_cursor_in_mode;
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let schema = crate::completion::SchemaCache::default();
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let input = "explain ";
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let completion =
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candidates_at_cursor_in_mode(input, input.len(), &schema, Mode::Advanced)
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.expect("explain offers candidates");
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let names: Vec<&str> = completion
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.candidates
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.iter()
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.map(|c| c.text.as_str())
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.collect();
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for verb in ["select", "with", "insert", "update", "delete", "show"] {
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assert!(names.contains(&verb), "expected `{verb}` in {names:?}");
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}
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}
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}
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