Preserve MySQL optimizer hints in generated query text (#4382)

* 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>

* Drop unit test; end-to-end coverage is sufficient

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

---------

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)