List table names shows address instead of strings

[liuxiaocs7]

In function NebulaCatalog.listTables

for (TagItem tag : metaClient.getTags(graphSpace)) {
    tables.add("VERTEX" + NebulaConstant.POINT + tag.tag_name);
}

The string is directly spliced to the byte array.

public byte[] tag_name;

And the listTables shows:

[VERTEX.[B@3b0143d3, EDGE.[B@7b49cea0]