Ignite 2.3 still not support group_concat

[james wu]

The new ignite 2.3 release doc said there are aggregation group_concat and
related usage
https://apacheignite-sql.readme.io/docs/group_concat, but look into the
source code, this function still not support
/** {@inheritDoc} */
    @Override public String getSQL() {
        String text;

        switch (type) {
            case GROUP_CONCAT:
                throw new UnsupportedOperationException();

            case COUNT_ALL:
                return "COUNT(*)";

            default:
                text = type.name();

                break;
        }

        if (distinct)
            return text + "(DISTINCT " + child().getSQL() + ")";

        return text + StringUtils.enclose(child().getSQL());
    }



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