[Feature-#1920][kingbase] fixed syntax error at or near "t1"

Author: libailin

chunjun-connectors/chunjun-connector-kingbase/src/main/java/com/dtstack/chunjun/connector/kingbase/dialect/KingbaseDialect.java

@@ -118,7 +118,7 @@ public String getInsertIntoStatement(String schema, String tableName, String[] f
                 Arrays.stream(fieldNames).map(f -> ":" + f).collect(Collectors.joining(", "));
         return "INSERT INTO "
                 + buildTableInfoWithSchema(schema, tableName)
-                + " t1 "
+                + " as t1 "
                 + "("
                 + columns
                 + ")"