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Huaijin
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## Summary - add a dedicated promql workspace crate for parsing and evaluation - keep cluster routing, cache, WAL, file-list, and request orchestration in openobserve-core - preserve existing service::promql call sites through a compatibility facade; the facade re-exports an explicit item list (not a glob), and the promql search orchestration in core depends on the promql crate directly - inject enterprise query cancellation through TableProvider instead of coupling the evaluator to core search state - replace the core regex-UDF dependency with DataFusion regexp_like expressions ## Companion PR - openobserve/o2-enterprise#2198 updates the enterprise workspace override for the new promql crate ## Validation - cargo fmt --all -- --check - cargo check --workspace - cargo clippy -p promql --all-targets -- -D warnings - cargo clippy -p openobserve-core - cargo test -p promql: 363 passed - verified the promql dependency tree has no openobserve-core or search dependency - cargo check -p o2_enterprise --lib in the paired private workspace ## Notes The evaluator moves atomically in this PR. The existing service::promql::search subtree remains in core because it owns OpenObserve-specific orchestration rather than PromQL evaluation. The two web/ file changes only update source-path references in comments that pointed at the moved Rust files (src/service/promql/... -> src/promql/src/...).