Preserve MySQL optimizer hints in stripped query text

Fixes #4353. Hint comments (/*+ ... */) on their own line were being
treated as regular block comments and removed from the query string
embedded in generated code. Inline hints already survived because the
surrounding line did not match the block-comment pattern.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: kyleconroy

internal/endtoend/testdata/mysql_optimizer_hints/mysql/go/db.go

@@ -0,0 +1,9 @@
+-- name: InlineHint :one
+SELECT /*+ MAX_EXECUTION_TIME(1000) */ bar FROM foo LIMIT 1;
+
+-- name: MultilineHint :one
+SELECT
+/*+ MAX_EXECUTION_TIME(1000) */
+bar
+FROM foo
+LIMIT 1;

internal/endtoend/testdata/mysql_optimizer_hints/mysql/go/models.go

@@ -0,0 +1 @@
+CREATE TABLE foo (bar text);

internal/endtoend/testdata/mysql_optimizer_hints/mysql/go/query.sql.go

@@ -0,0 +1,12 @@
+{
+  "version": "1",
+  "packages": [
+    {
+      "path": "go",
+      "engine": "mysql",
+      "name": "querytest",
+      "schema": "schema.sql",
+      "queries": "query.sql"
+    }
+  ]
+}

internal/endtoend/testdata/mysql_optimizer_hints/mysql/query.sql

@@ -115,6 +115,12 @@ func StripComments(sql string) (string, []string, error) {
 			continue
 		}
 		if strings.HasPrefix(t, "/*") && strings.HasSuffix(t, "*/") {
+			// Preserve MySQL optimizer hints, which share block-comment
+			// syntax but are semantically part of the query.
+			if strings.HasPrefix(t, "/*+") {
+				lines = append(lines, t)
+				continue
+			}
 			t = strings.TrimPrefix(t, "/*")
 			t = strings.TrimSuffix(t, "*/")
 			comments = append(comments, t)

internal/endtoend/testdata/mysql_optimizer_hints/mysql/schema.sql

@@ -0,0 +1,60 @@
+package source
+
+import (
+	"strings"
+	"testing"
+)
+
+func TestStripComments(t *testing.T) {
+	type test struct {
+		name        string
+		input       string
+		wantSQL     string
+		wantComment []string
+	}
+
+	tests := []test{
+		{
+			name:        "plain block comment on its own line is stripped",
+			input:       "SELECT 1\n/* a comment */\nFROM foo",
+			wantSQL:     "SELECT 1\nFROM foo",
+			wantComment: []string{" a comment "},
+		},
+		{
+			name:    "inline optimizer hint is preserved",
+			input:   "SELECT /*+ MAX_EXECUTION_TIME(1000) */ * FROM t1",
+			wantSQL: "SELECT /*+ MAX_EXECUTION_TIME(1000) */ * FROM t1",
+		},
+		{
+			name:    "multi-line optimizer hint is preserved",
+			input:   "SELECT\n/*+ MAX_EXECUTION_TIME(1000) */\n*\nFROM t1",
+			wantSQL: "SELECT\n/*+ MAX_EXECUTION_TIME(1000) */\n*\nFROM t1",
+		},
+		{
+			name:    "query name comment is dropped",
+			input:   "/* name: Foo :one */\nSELECT 1",
+			wantSQL: "SELECT 1",
+		},
+		{
+			name:        "dash comments are collected",
+			input:       "-- helpful note\nSELECT 1",
+			wantSQL:     "SELECT 1",
+			wantComment: []string{" helpful note"},
+		},
+	}
+
+	for _, tc := range tests {
+		t.Run(tc.name, func(t *testing.T) {
+			gotSQL, gotComments, err := StripComments(tc.input)
+			if err != nil {
+				t.Fatalf("unexpected error: %v", err)
+			}
+			if gotSQL != tc.wantSQL {
+				t.Errorf("SQL mismatch\n got: %q\nwant: %q", gotSQL, tc.wantSQL)
+			}
+			if strings.Join(gotComments, "|") != strings.Join(tc.wantComment, "|") {
+				t.Errorf("comments mismatch\n got: %q\nwant: %q", gotComments, tc.wantComment)
+			}
+		})
+	}
+}