refactor(func): optimize function array_aggregate

[forsaken628]

I hereby agree to the terms of the CLA available at: https://docs.databend.com/dev/policies/cla/

Summary

Avoid repeatedly constructing new aggregate evaluators for each row.

Tests

• Unit Test
• Logic Test
• Benchmark Test
• No Test - Explain why

Type of change

• Bug Fix (non-breaking change which fixes an issue)
• New Feature (non-breaking change which adds functionality)
• Breaking Change (fix or feature that could cause existing functionality not to work as expected)
• Documentation Update
• Refactoring
• Performance Improvement
• Other (please describe):

---

This change is 

[github-actions]

Docker Image for PR

• tag: pr-19005-7f1befd-1763957818

note: this image tag is only available for internal use.

[github-actions]

ClickBench Report

• hits: https://benchmark.databend.com/clickbench/pr/19005/19621968053/hits.html
• tpch: https://benchmark.databend.com/clickbench/pr/19005/19621968053/tpch.html

[forsaken628]

benchmark

sql

select array_count(array_append(a,number)) from numbers(10000000),(values([1,2])) t(a) IGNORE_RESULT ;

before:

version: Databend Query v1.2.844-nightly-087c873da4(rust-1.88.0-nightly-2025-11-18T06:41:30.765750122Z)
size: Xsmall
duration: 1.7s

after:

version: Databend Query v1.2.848-nightly-7f1befd26e(rust-1.88.0-nightly-2025-11-24T03:51:53.804747504Z)
size: Xsmall
duration: 383ms