feat(query): use cluster keys in DPhyp join costing

[forsaken628]

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

Summary

• Carry cluster-key expressions through optimizer statistics so scan/filter/limit/join-derived stats can expose usable cluster-key order.
• Add cluster-key-aware DPhyp join costing for probe-side join keys, including expression cluster keys.

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):

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This change is 

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[github-actions]

Docker Image for PR

• tag: pr-19941-ffd1ffd-1781073655

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

[github-actions]

ClickBench Report

• hits: https://benchmark.databend.com/clickbench/pr/19941/27252359451/hits.html
• internal: https://benchmark.databend.com/clickbench/pr/19941/27252359451/internal.html
• load: https://benchmark.databend.com/clickbench/pr/19941/27252359451/load.html
• tpch100: https://benchmark.databend.com/clickbench/pr/19941/27252359451/tpch100.html
• tpch1000: https://benchmark.databend.com/clickbench/pr/19941/27252359451/tpch1000.html

[github-actions]

Docker Image for PR

• tag: pr-19941-84c4dbc-1781417721

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

[github-actions]

ClickBench Report

• hits: https://benchmark.databend.com/clickbench/pr/19941/27488777384/hits.html
• internal: https://benchmark.databend.com/clickbench/pr/19941/27488777384/internal.html
• load: https://benchmark.databend.com/clickbench/pr/19941/27488777384/load.html
• tpch100: https://benchmark.databend.com/clickbench/pr/19941/27488777384/tpch100.html
• tpch1000: https://benchmark.databend.com/clickbench/pr/19941/27488777384/tpch1000.html

[github-actions]

Docker Image for PR

• tag: pr-19941-ff849bd-1781492395

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

[github-actions]

ClickBench Report

• hits: https://benchmark.databend.com/clickbench/pr/19941/27519662964/hits.html
• tpch100: https://benchmark.databend.com/clickbench/pr/19941/27519662964/tpch100.html
• tpch1000: https://benchmark.databend.com/clickbench/pr/19941/27519662964/tpch1000.html

[github-actions]

🤖 CI Job Analysis

Workflow: 27525191088

📊 Summary

• Total Jobs: 88
• Failed Jobs: 1
• Retryable: 0
• Code Issues: 1

❌ NO RETRY NEEDED

All failures appear to be code/test issues requiring manual fixes.

🔍 Job Details

• ❌ linux / PROXY routing benchmark (statistics): Not retryable (Code/Test)

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