If there is no aggregated column in aggregate index, the index will be deduplicate table.
For example:
aggregate table (k1, k2, v1 sum)
mv index (k1, k2)
This kind of index is SPJG which same as `select k1, k2 from aggregate_table group by k1, k2`.
It also need to check the grouping column using following steps.
If there is no aggregated column in duplicate index, the index will be SPJ which passes the grouping verification directly.
Also after the supplement of index, the new candidate index should be checked the output columns also.
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