Doris on es 聚合下推

[Userwhite]

Proposed changes

support pushdown aggregate operator to ES
#6989

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• Bugfix (non-breaking change which fixes an issue)
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• I have created an issue on (Fix #ISSUE) and described the bug/feature there in detail
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Further comments

If this is a relatively large or complex change, kick off the discussion at dev@doris.apache.org by explaining why you chose the solution you did and what alternatives you considered, etc...

[wuyunfeng]

@Userwhite As discussed in our online meeting，we should move the predicate-transform from BE (backends) to FE (frontends) which would contribute significant effect for subsequent planning and extension. We will continue to pay more attention and participation in this PR

[Userwhite]

@Userwhite As discussed in our online meeting，we should move the predicate-transform from BE (backends) to FE (frontends) which would contribute significant effect for subsequent planning and extension. We will continue to pay more attention and participation in this PR

OK, I know it. I will deal with it recently. Now nothing has done because I am busy in the last and this week😂

[stalary]

Recently, I want to do the generate DSL up to FE, and I also want to support aggregation push down. Can we communicate on wechat? my wechat is 17853149599. @Userwhite

[jackwener]

This PR has not been updated for a long time.

There could be many reasons.

If it's caused by there are no maintainers to push or ignore this PR, I'm sorry.

If you contact maintainer or want to continue this PR, feel free to @me or @other maintainers.