Wrap IN predicate subquery in ScalarSubquery for JSON output

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: kyleconroy

parser/marshal.go

@@ -3429,7 +3429,10 @@ func booleanExpressionToJSON(expr ast.BooleanExpression) jsonNode {
 			node["Values"] = values
 		}
 		if e.Subquery != nil {
-			node["Subquery"] = queryExpressionToJSON(e.Subquery)
+			node["Subquery"] = jsonNode{
+				"$type":           "ScalarSubquery",
+				"QueryExpression": queryExpressionToJSON(e.Subquery),
+			}
 		}
 		return node
 	case *ast.BooleanLikeExpression:

parser/testdata/BaselinesCommon_TSqlParserTestScript5/metadata.json

@@ -1 +1 @@
-{"todo": true}
+{}

parser/testdata/OpenRowsetBulkStatementTests150/metadata.json

@@ -1 +1,4 @@
-{"todo": true}
+{
+  "todo": true,
+  "skip_reason": "ScriptDOM normalizes JSON strings in ROWSET_OPTIONS, removing whitespace and changing case"
+}

parser/testdata/TSqlParserTestScript5/metadata.json

@@ -1 +1 @@
-{"todo": true}
+{}