fix(editability): allow digit-leading unquoted table names

apps/desktop/src/lib/__tests__/sql/digitLeadingIdentifier.spec.ts

@@ -0,0 +1,50 @@
+import { describe, expect, it } from "vitest";
+import { analyzeEditableQueryEditability } from "@/lib/sql/sqlAnalysis";
+import { extractIdentifierAt, extractQualifiedIdentifierAt } from "@/lib/sql/sqlNavigation";
+
+/**
+ * MySQL/MariaDB allow an unquoted identifier to start with a digit as long as it is not a pure
+ * number: `01_tablename` is a table name, `123` / `1e3` stay numeric literals. Before this the
+ * grid could not map the result back to a base table (read-only) and hover/Ctrl+click found no
+ * identifier at all. Regression coverage for #9992.
+ */
+describe("digit-leading identifiers (#9992)", () => {
+  it("treats a digit-leading table name as editable", () => {
+    const result = analyzeEditableQueryEditability("select * from 01_tablename");
+
+    expect(result.editable).toBe(true);
+    if (!result.editable) return;
+    expect(result.analysis.tableName).toBe("01_tablename");
+    expect(result.analysis.tableNameQuoted).toBe(false);
+    expect(result.analysis.selectStar).toBe(true);
+  });
+
+  it("keeps schema-qualified digit-leading table names editable", () => {
+    const result = analyzeEditableQueryEditability("select id, name from app.01_tablename");
+
+    expect(result.editable).toBe(true);
+    if (!result.editable) return;
+    expect(result.analysis.schema).toBe("app");
+    expect(result.analysis.tableName).toBe("01_tablename");
+    expect(result.analysis.columns.map((column) => column.sourceName)).toEqual(["id", "name"]);
+  });
+
+  it("still treats a pure number as a literal instead of a source", () => {
+    expect(analyzeEditableQueryEditability("select * from 123").editable).toBe(false);
+    expect(analyzeEditableQueryEditability("select * from 1e3").editable).toBe(false);
+  });
+
+  it("extracts digit-leading identifiers for hover and Ctrl+click", () => {
+    const sql = "select * from 01_tablename";
+
+    expect(extractIdentifierAt(sql, sql.indexOf("01_tablename"))).toBe("01_tablename");
+    expect(extractQualifiedIdentifierAt(sql, sql.indexOf("01_tablename"))?.parts).toEqual([{ value: "01_tablename", quoted: false }]);
+  });
+
+  it("does not extract numeric literals as identifiers", () => {
+    const sql = "select 123, 1e3 from t";
+
+    expect(extractIdentifierAt(sql, sql.indexOf("123"))).toBeNull();
+    expect(extractIdentifierAt(sql, sql.indexOf("1e3"))).toBeNull();
+  });
+});

apps/desktop/src/lib/__tests__/sql/sqlNavigation.spec.ts

@@ -355,11 +355,11 @@ describe("标识符提取的字符边界", () => {
     expect(extractIdentifierAt(sql, sql.indexOf("$col"))).toBe("$col");
   });
 
-  it("数字开头的片段不被当作标识符（只识别其后的字母段）", () => {
-    const sql = "select 1abc from t";
+  it("数字开头的标识符按 MySQL 规则识别，纯数字仍是字面量", () => {
+    const sql = "select 1abc, 123 from t";
 
-    expect(extractIdentifierAt(sql, sql.indexOf("1abc"))).toBeNull();
-    expect(extractIdentifierAt(sql, sql.indexOf("abc"))).toBe("abc");
+    expect(extractIdentifierAt(sql, sql.indexOf("1abc"))).toBe("1abc");
+    expect(extractIdentifierAt(sql, sql.indexOf("123"))).toBeNull();
   });
 
   it("引号包裹的中文标识符去掉引号并标记 quoted", () => {

apps/desktop/src/lib/sql/sqlAnalysis.ts

@@ -748,7 +748,28 @@ function readIdentifier(text: string, start: number): { value: string; quoted: b
     return null;
   }
   const match = text.slice(pos).match(/^[\p{ID_Start}_][\p{ID_Continue}$]*/u);
-  return match ? { value: match[0], quoted: false, end: pos + match[0].length } : null;
+  if (match) return { value: match[0], quoted: false, end: pos + match[0].length };
+  // MySQL/MariaDB also allow an unquoted identifier to begin with a digit as long as it is not a
+  // pure number, so `select * from 01_tablename` maps back to a base table while `123` / `1e3`
+  // stay literals (#9992).
+  const digitMatch = text.slice(pos).match(/^[0-9][\p{ID_Continue}$]*/u);
+  if (digitMatch && !isNumberShapedToken(digitMatch[0])) {
+    return { value: digitMatch[0], quoted: false, end: pos + digitMatch[0].length };
+  }
+  return null;
+}
+
+/**
+ * Mirrors `sqlNavigation.isNumberShapedToken`: a digit-leading token is only an identifier when
+ * it is not a number (`123`, `1e3`, `0x1f`, `0b101`). See #9992.
+ */
+function isNumberShapedToken(value: string): boolean {
+  if (!/^[0-9]/.test(value)) return false;
+  const rest = value.slice(1).toLowerCase();
+  if (rest === "") return true;
+  if (rest.startsWith("x")) return /^x[0-9a-f]+$/.test(rest);
+  if (rest.startsWith("b")) return /^b[01]+$/.test(rest);
+  return /^[0-9e]+$/.test(rest);
 }
 
 function skipWhitespace(text: string, pos: number): number {

apps/desktop/src/lib/sql/sqlNavigation.ts

@@ -315,6 +315,21 @@ function isIdentifierStartChar(char: string | undefined): boolean {
   return !!char && IDENTIFIER_START_CHAR.test(char);
 }
 
+/**
+ * MySQL/MariaDB allow an unquoted identifier to begin with a digit as long as it is not a pure
+ * number, so `01_tablename` is a table name while `123` / `1e3` / `0x1f` stay numeric literals
+ * (#9992). Other dialects reject the statement at parse time, so accepting the token here cannot
+ * resolve an identifier the server would refuse to run.
+ */
+function isNumberShapedToken(value: string): boolean {
+  if (!/^[0-9]/.test(value)) return false;
+  const rest = value.slice(1).toLowerCase();
+  if (rest === "") return true;
+  if (rest.startsWith("x")) return /^x[0-9a-f]+$/.test(rest);
+  if (rest.startsWith("b")) return /^b[01]+$/.test(rest);
+  return /^[0-9e]+$/.test(rest);
+}
+
 function isIdentifierChar(char: string | undefined): boolean {
   return !!char && IDENTIFIER_PART_CHAR.test(char);
 }
@@ -341,10 +356,14 @@ function readQuotedPart(text: string, start: number): IdentifierPart | null {
 }
 
 function readUnquotedPart(text: string, start: number): IdentifierPart | null {
-  if (!isIdentifierStartChar(text[start])) return null;
+  const first = text[start];
+  const startsWithDigit = !!first && /^[0-9]$/.test(first);
+  if (!isIdentifierStartChar(first) && !startsWithDigit) return null;
   let end = start + 1;
   while (end < text.length && isIdentifierChar(text[end])) end += 1;
-  return { value: text.slice(start, end), start, end, quoted: false };
+  const value = text.slice(start, end);
+  if (startsWithDigit && isNumberShapedToken(value)) return null;
+  return { value, start, end, quoted: false };
 }
 
 function readIdentifierPart(text: string, start: number): IdentifierPart | null {

crates/dbx-sql/src/sql_editability.rs

@@ -924,17 +924,27 @@ fn read_identifier(text: &str, start: usize) -> Option<Identifier> {
         return None;
     }
 
-    if !is_identifier_start(first) {
+    // MySQL/MariaDB let an unquoted identifier start with a digit as long as it is not a pure
+    // number, so `01_tablename` is a table name while `123` / `1e3` stay literals (#9992).
+    // Every other dialect that reaches this lenient analyzer rejects a leading digit at parse
+    // time, so accepting the token here cannot mis-bind a statement the server would run.
+    if !is_identifier_start(first) && !first.is_ascii_digit() {
         return None;
     }
     let mut end = pos + first.len_utf8();
+    let mut value_end = text.len();
     for (offset, ch) in text[end..].char_indices() {
         if !is_identifier_char(ch) {
-            return Some(Identifier { value: text[pos..end + offset].to_string(), quoted: false, end: end + offset });
+            value_end = end + offset;
+            break;
         }
     }
-    end = text.len();
-    Some(Identifier { value: text[pos..end].to_string(), quoted: false, end })
+    end = value_end;
+    let value = &text[pos..end];
+    if first.is_ascii_digit() && is_number_shaped(value) {
+        return None;
+    }
+    Some(Identifier { value: value.to_string(), quoted: false, end })
 }
 
 fn skip_whitespace(text: &str, pos: usize) -> usize {
@@ -1076,6 +1086,25 @@ fn is_identifier_start(ch: char) -> bool {
     ch == '_' || unicode_ident::is_xid_start(ch)
 }
 
+/// Numeric literals keep their meaning even though MySQL allows an unquoted identifier to begin
+/// with a digit: `123`, `1e3`, `0x1f` and `0b11` are numbers, `01_tablename` is not (#9992).
+fn is_number_shaped(value: &str) -> bool {
+    let lower = value.to_ascii_lowercase();
+    let Some(rest) = lower.strip_prefix(|ch: char| ch.is_ascii_digit()) else {
+        return false;
+    };
+    if rest.is_empty() {
+        return true;
+    }
+    if let Some(hex) = rest.strip_prefix('x') {
+        return !hex.is_empty() && hex.chars().all(|ch| ch.is_ascii_hexdigit());
+    }
+    if let Some(bits) = rest.strip_prefix('b') {
+        return !bits.is_empty() && bits.chars().all(|ch| ch == '0' || ch == '1');
+    }
+    rest.chars().all(|ch| ch.is_ascii_digit() || matches!(ch, 'e' | '+' | '-'))
+}
+
 fn is_identifier_char(ch: char) -> bool {
     ch == '$' || unicode_ident::is_xid_continue(ch)
 }
@@ -1084,6 +1113,55 @@ fn is_identifier_char(ch: char) -> bool {
 mod tests {
     use super::*;
 
+    #[test]
+    fn recognizes_digit_leading_identifiers_per_issue_9992() {
+        // MySQL/MariaDB allow an unquoted identifier that starts with a digit as long as it is
+        // not a pure number, so `01_tablename` must resolve like any other table name.
+        assert_eq!(read_identifier("01_tablename", 0).map(|ident| ident.value), Some("01_tablename".to_string()));
+        assert_eq!(
+            read_identifier("`01_tablename`", 0).map(|ident| (ident.value, ident.quoted)),
+            Some(("01_tablename".to_string(), true))
+        );
+        // Number-shaped tokens stay literals instead of becoming identifiers.
+        assert!(read_identifier("123", 0).is_none());
+        assert!(read_identifier("1e3", 0).is_none());
+        assert!(read_identifier("0x1f", 0).is_none());
+        assert!(is_number_shaped("123"));
+        assert!(is_number_shaped("1e3"));
+        assert!(is_number_shaped("0x1f"));
+        assert!(is_number_shaped("0b101"));
+        assert!(!is_number_shaped("01_tablename"));
+        assert!(!is_number_shaped("1abc"));
+        assert!(!is_number_shaped("t1"));
+
+        let result = analyze_editable_query_editability("select * from 01_tablename");
+        assert!(result.editable, "{:?}", result.reason);
+        let analysis = result.analysis.expect("analysis");
+        assert_eq!(analysis.table_name, "01_tablename");
+        assert!(!analysis.table_name_quoted);
+        assert!(analysis.select_star);
+
+        let qualified = analyze_editable_query_editability("select id, name from app.01_tablename");
+        assert!(qualified.editable, "{:?}", qualified.reason);
+        let qualified_analysis = qualified.analysis.expect("analysis");
+        assert_eq!(qualified_analysis.schema.as_deref(), Some("app"));
+        assert_eq!(qualified_analysis.table_name, "01_tablename");
+        assert_eq!(
+            qualified_analysis.columns,
+            vec![
+                column(Some("id"), false, None, None, "id", "id"),
+                column(Some("name"), false, None, None, "name", "name"),
+            ]
+        );
+
+        // A pure numeric projection stays an expression, not a column reference.
+        let literal = analyze_editable_query_editability("select 123 from 01_tablename");
+        let literal_analysis = literal.analysis.expect("analysis");
+        assert_eq!(literal_analysis.columns.len(), 1);
+        assert_eq!(literal_analysis.columns[0].source_name, None);
+        assert_eq!(literal_analysis.columns[0].expression, "123");
+    }
+
     #[test]
     fn recognizes_simple_single_table_select_as_editable() {
         let result =