Say there are the following entities:
{ID:1, width: 5, height: 11, ... },
{ID:2, width: 5, height: 12, ... },
{ID:3, width: 5, height: 12, ... },
{ID:4, width: 6, height: 13, ... },
{ID:5, width: 5, height: 12, ... },
{ID:6, width: 5, height: 13, ... },
{ID:7, width: 5, height: 12, ... },
...
What's the most efficient way to return the set of heights ( the same values
are merged ) for all width==5? ( the answer should be 11, 12, 13 ).
We can build a query to enumerate all entities where width==5 and then build
the set in code (java/python). But this is not salable, we might have
thousands of entities share the same value.
I wish we can query the indexes...
Thanks!
- Tom
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