fix csv rest tests

Author: jan-elastic

x-pack/plugin/esql/qa/server/src/main/java/org/elasticsearch/xpack/esql/qa/rest/EsqlSpecTestCase.java

@@ -380,6 +380,9 @@ private Object valueMapper(CsvTestUtils.Type type, Object value) {
         if (value == null) {
             return "null";
         }
+        if (value instanceof CsvTestUtils.Range) {
+            return value;
+        }
         if (type == CsvTestUtils.Type.GEO_POINT || type == CsvTestUtils.Type.CARTESIAN_POINT) {
             // Point tests are failing in clustered integration tests because of tiny precision differences at very small scales
             if (value instanceof String wkt) {
@@ -421,6 +424,17 @@ private Object valueMapper(CsvTestUtils.Type type, Object value) {
                 }
             }
         }
+        if (type == CsvTestUtils.Type.DOUBLE || type == CsvTestUtils.Type.INTEGER || type == CsvTestUtils.Type.LONG) {
+            if (value instanceof List<?> vs) {
+                return vs.stream().map(v -> valueMapper(type, v)).toList();
+            } else if (type == CsvTestUtils.Type.DOUBLE) {
+                return ((Number) value).doubleValue();
+            } else if (type == CsvTestUtils.Type.INTEGER) {
+                return ((Number) value).intValue();
+            } else if (type == CsvTestUtils.Type.LONG) {
+                return ((Number) value).longValue();
+            }
+        }
         return value.toString();
     }