fix(mysql): strip CLI \G suffix before executing queries

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

@@ -1,6 +1,6 @@
 import { describe, expect, it } from "vitest";
 import { executionCandidateForMode } from "@/lib/sql/sqlExecutionTarget";
-import { buildExecutionCandidates, currentExecutableStatementRange, executableStatementRanges, fullSqlRange, hasMultipleExecutionTargets, splitSqlStatementRanges, statementRangeAtCursor, supportsExecutionTargetPicker } from "@/lib/sql/sqlStatementRanges";
+import { buildExecutionCandidates, currentExecutableStatementRange, executableStatementRanges, fullSqlRange, hasMultipleExecutionTargets, splitSqlStatementRanges, statementRangeAtCursor, stripMysqlClientDisplayCommand, supportsExecutionTargetPicker } from "@/lib/sql/sqlStatementRanges";
 
 function indexOf(sql: string, needle: string, occurrence = 1): number {
   let from = 0;
@@ -377,6 +377,25 @@ BEGIN
 END;
 SELECT 3 FROM DUMMY;`;
 
+describe("stripMysqlClientDisplayCommand", () => {
+  it("removes a trailing MySQL CLI vertical-output command", () => {
+    expect(stripMysqlClientDisplayCommand("SHOW CREATE FUNCTION fun_grade \\G")).toBe("SHOW CREATE FUNCTION fun_grade");
+    expect(stripMysqlClientDisplayCommand("SHOW CREATE FUNCTION fun_grade \\G;")).toBe("SHOW CREATE FUNCTION fun_grade;");
+    expect(stripMysqlClientDisplayCommand("SELECT 1\\G\n")).toBe("SELECT 1\n");
+  });
+
+  it("removes the lowercase terminator and a command following the semicolon", () => {
+    expect(stripMysqlClientDisplayCommand("SHOW STATUS \\g")).toBe("SHOW STATUS");
+    expect(stripMysqlClientDisplayCommand("SELECT 1; \\G")).toBe("SELECT 1;");
+  });
+
+  it("does not rewrite ordinary SQL or a command inside a line comment", () => {
+    expect(stripMysqlClientDisplayCommand("SELECT '\\G'")).toBe("SELECT '\\G'");
+    expect(stripMysqlClientDisplayCommand("SELECT 1 -- keep \\G")).toBe("SELECT 1 -- keep \\G");
+    expect(stripMysqlClientDisplayCommand("SELECT 1 # keep \\G")).toBe("SELECT 1 # keep \\G");
+  });
+});
+
 describe("splitSqlStatementRanges", () => {
   it("splits multiple top-level statements", () => {
     const sql = "SELECT 1;\nSELECT 2;\nSELECT 3;";

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

@@ -32,6 +32,22 @@ export function supportsExecutionTargetPicker(databaseType?: DatabaseType): bool
   return !!databaseType && (databaseType === "redis" || isHttpJsonRestDatabaseType(databaseType) || !NON_SQL_EXECUTION_TARGET_TYPES.has(databaseType));
 }
 
+/** Remove the MySQL CLI's trailing vertical-output command before execution. */
+export function stripMysqlClientDisplayCommand(sql: string): string {
+  const trimmed = sql.trimEnd();
+  const hasTrailingSemicolon = trimmed.endsWith(";");
+  const withoutTrailingSemicolon = hasTrailingSemicolon ? trimmed.slice(0, -1).trimEnd() : trimmed;
+  if (!withoutTrailingSemicolon.endsWith("\\G") && !withoutTrailingSemicolon.endsWith("\\g")) return sql;
+
+  const markerStart = withoutTrailingSemicolon.length - 2;
+  const lineStart = withoutTrailingSemicolon.lastIndexOf("\n", markerStart - 1) + 1;
+  const linePrefix = withoutTrailingSemicolon.slice(lineStart, markerStart);
+  if (linePrefix.includes("--") || linePrefix.includes("#")) return sql;
+
+  const executableSql = withoutTrailingSemicolon.slice(0, markerStart).trimEnd();
+  return `${executableSql}${hasTrailingSemicolon ? ";" : ""}${sql.slice(trimmed.length)}`;
+}
+
 export function hasMultipleExecutionTargets(sql: string, databaseType?: DatabaseType, parameterOptions?: SqlParameterOptions): boolean {
   if (databaseType === "redis") {
     return redisExecutableCommandCount(sql) > 1;