Fix #906: execute viral propagation only at combination points (main, DuckDB-only) - #908

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Commits on Jul 16, 2026

Port #906 to main: execute viral propagation only at combination points
javihern98
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d23b523
test: assert dataset-scalar binary copies viral (no rule executed/required) (cr-906-main)
javihern98
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4703c66
test: real operators in viral row-preserving tests + cover rule combine in group/partition (cr-906-main)
javihern98
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f62fa64
fix: apply enumerated viral propagation rule to single-element groups in DuckDB (cr-906-main)
javihern98
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7ae070a
test: add join viral + row-preserving-copy coverage to align main with 1.9.X (cr-906-main)
javihern98
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4628e05
test: port full viral coverage from 1.9.X to align main (operators, propagation, joins, keep, parsing, validation) (cr-906-main)
javihern98
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0f43b30