fix(editor): ignore formatter parse errors for incomplete SQL

Closes #5462

apps/desktop/src/components/editor/QueryEditor.vue

@@ -18,7 +18,7 @@ import { executableStatementRangeAtCursor, executableStatementRangeCacheForDoc,
 import { currentStatementFrameRangeTo, shouldRebuildCurrentStatementFrame, visualSqlColumnsWithInlineHints } from "@/lib/sql/currentStatementFrame";
 import { expandToSqlStatementWindow, parseInsertValueHints } from "@/lib/sql/insertValueHints";
 import { insertValueHintColumnNames } from "@/lib/sql/insertValueHintColumns";
-import { formatSqlText, compressSqlText, type SqlFormatDialect } from "@/lib/sql/sqlFormatter";
+import { formatSqlForEditing, compressSqlText, type SqlFormatDialect } from "@/lib/sql/sqlFormatter";
 import { detectAndFormatStructured } from "@/lib/sql/autoFormat";
 import { enabledSqlParameterSyntaxes, resolveSqlVariableSyntaxToggles } from "@/lib/sql/sqlVariableSyntax";
 import { blankLineDeletionChanges, replaceSelectedEditorText } from "@/lib/editor/queryEditorTextEdits";
@@ -2563,7 +2563,7 @@ async function formatCurrentSql() {
         toast(t("toolbar.formatAutoDetectFailed"), 3000);
         return;
       } else {
-        formatted = await formatSqlText(source, props.formatDialect ?? props.dialect ?? "generic", settingsStore.editorSettings.sqlFormatter);
+        formatted = await formatSqlForEditing(source, props.formatDialect ?? props.dialect ?? "generic", settingsStore.editorSettings.sqlFormatter);
       }
     }
     if (view.value !== currentView || currentView.state !== originalState || currentView.state.sliceDoc(from, to) !== source) {

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

@@ -1,5 +1,5 @@
 import { describe, expect, it } from "vitest";
-import { formatSqlForDisplay, formatSqlText, MAX_SQL_FORMAT_CHARS, sqlFormatDialectForDbType, UnsupportedStructuredInputError } from "@/lib/sql/sqlFormatter";
+import { formatSqlForDisplay, formatSqlForEditing, formatSqlText, MAX_SQL_FORMAT_CHARS, sqlFormatDialectForDbType, UnsupportedStructuredInputError } from "@/lib/sql/sqlFormatter";
 
 describe("sqlFormatter", () => {
   it("maps PostgreSQL-compatible database types to the postgres formatter dialect", () => {
@@ -50,6 +50,19 @@ describe("sqlFormatter", () => {
     expect(formatted).toContain("AS id");
   });
 
+  it("keeps incomplete editor SQL unchanged when the formatter cannot parse it", async () => {
+    const sql = "select *\nfrom dbname.\n;";
+
+    await expect(formatSqlText(sql, "mysql")).rejects.toThrow("Parse error at token:");
+    await expect(formatSqlForEditing(sql, "mysql")).resolves.toBe(sql);
+  });
+
+  it("keeps non-parse editor formatting failures visible", async () => {
+    const oversizedSql = "x".repeat(MAX_SQL_FORMAT_CHARS + 1);
+
+    await expect(formatSqlForEditing(oversizedSql, "mysql")).rejects.toThrow("SQL is too large to format safely.");
+  });
+
   it("returns the original SQL for display when formatting fails", async () => {
     const oversizedSql = "x".repeat(MAX_SQL_FORMAT_CHARS + 1);
 

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

@@ -106,6 +106,21 @@ export async function formatSqlText(sql: string, dialect: SqlFormatDialect = "ge
   }
 }
 
+function isSqlFormatterParseError(error: unknown): boolean {
+  if (!(error instanceof Error) || !error.message.startsWith("Parse error at token:")) return false;
+  const candidate = error as Error & { offset?: unknown; token?: unknown };
+  return typeof candidate.offset === "number" && candidate.token !== undefined;
+}
+
+export async function formatSqlForEditing(sql: string, dialect: SqlFormatDialect = "generic", settings: Partial<SqlFormatterSettings> = DEFAULT_SQL_FORMATTER_SETTINGS): Promise<string> {
+  try {
+    return await formatSqlText(sql, dialect, settings);
+  } catch (error) {
+    if (isSqlFormatterParseError(error)) return sql;
+    throw error;
+  }
+}
+
 /**
  * 压缩 SQL 时使用的方言。不同方言对引号、注释、转义的处理不同：
  * - `mysql`：保留 MySQL 可执行注释与 optimizer hint；单引号字符串支持反斜杠转义