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dennis zhuang
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* perf(promql): propagate matching filters through grouped joins Signed-off-by: Dennis Zhuang <killme2008@gmail.com> * perf(promql): check matcher safety on the receiving operand Signed-off-by: Dennis Zhuang <killme2008@gmail.com> * refactor(promql): spell out the shapes a filter may cross `preserves_filter` ended in `_ => true`, which was only sound because `selector_matchers` independently rejects label rewriting, `count_values`, subqueries and non-rollup calls on the same operand. Loosening the latter alone would have silently pushed a matcher below a label rewrite. List the shapes that carry a scan filter instead and default to `false`. Cite #9207 for the result labels the grouped cases record: the join projects the right operand's tag set, so `zone` is missing wherever the right side aggregates it away. No behavior change. Signed-off-by: Dennis Zhuang <killme2008@gmail.com> * test(promql): assert the new pushdowns reach the scan The grouped-join unit tests feed tag columns by hand and the SQLness case only checks results, which are identical whether or not the rewrite fires. Nothing would have failed if scalar arithmetic, ranking or grouped matching stopped propagating. Assert through the planner that the matcher reaches both scans, with a global topk one-side as the counter-example. Also state that the duplicate-one-side cases record a cross product Prometheus rejects (#9209), so the baseline is not read as intended semantics. Signed-off-by: Dennis Zhuang <killme2008@gmail.com> --------- Signed-off-by: Dennis Zhuang <killme2008@gmail.com>