Fix test

Author: wy1433

infra/rewrite/core/src/main/java/org/apache/shardingsphere/infra/rewrite/engine/RouteSQLRewriteEngine.java

@@ -81,8 +81,10 @@ public RouteSQLRewriteResult rewrite(final SQLRewriteContext sqlRewriteContext,
 
     private int getMaxUnionSizePerDataSource(final QueryContext queryContext) {
         ConfigurationProperties props = queryContext.getMetaData().getProps();
-        Integer result = null == props ? null : props.getValue(ConfigurationPropertyKey.MAX_UNION_SIZE_PER_DATASOURCE);
-        return null == result ? Integer.parseInt(ConfigurationPropertyKey.MAX_UNION_SIZE_PER_DATASOURCE.getDefaultValue()) : result;
+        if (null == props || null == props.getProps()) {
+            return Integer.parseInt(ConfigurationPropertyKey.MAX_UNION_SIZE_PER_DATASOURCE.getDefaultValue());
+        }
+        return props.<Integer>getValue(ConfigurationPropertyKey.MAX_UNION_SIZE_PER_DATASOURCE);
     }
 
     private Map<RouteUnit, SQLRewriteUnit> createSQLRewriteUnits(final SQLRewriteContext sqlRewriteContext, final RouteContext routeContext, final int maxUnionSizePerDataSource) {