public java.lang.String getSql() {
        java.lang.Object ref = sql_;
        if (!(ref instanceof java.lang.String)) {
          com.google.protobuf.ByteString bs =
              (com.google.protobuf.ByteString) ref;
          java.lang.String s = bs.toStringUtf8();
          if (bs.isValidUtf8()) {
            sql_ = s;
          }
          return s;
        } else {
          return (java.lang.String) ref;
        }
      }
<code>optional string ddlSchemaName = 15;</code>

<pre>
* current ddl schemaName *
</pre>
node/etl/src/main/java/com/alibaba/otter/node/etl/model/protobuf/BatchProto.java