[OPPRO-223] Change to use partial avg in Velox

[rui-mo]

What changes were proposed in this pull request?

Previously, we use sum and count to replace partial avg. But incompatible intermediate type was found for avg(int). Instead of adding a projection for casting bigint to double, we changed to use partial avg in Velox and extract the subfields from struct.

Depends on https://github.com/oap-project/velox/pull/38.

How was this patch tested?

under test

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See also:

• Other pull requests