Add per-row arithmetic and date/datetime math operators - #48
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Closes the gap that made per-row computed columns inexpressible. Adds to the each* family established in 0.2.0: - eachAdd / eachSubtract / eachMultiply / eachDivide (numeric) values items accept numericReturning or numericArrayReturning, result is numericArrayReturning; usable in select, aggregate args, and right operand of each* comparisons. - eachDateAddDays / eachDateDiffDays (days as the unit) - eachDatetimeAddSeconds / eachDatetimeDiffSeconds (seconds as the unit) Larger date/datetime units are obtained by composition with eachMultiply (e.g. add N hours = eachDatetimeAddSeconds(dt, eachMultiply(n, 3600))). No interval type or per-unit operator family is introduced. CLAUDE.md rewritten around the "two operator families" model; previously-outdated rules about fields in arithmetic/comparison are replaced with a where-each-family-fits table. README extended with per-operator subsections and four new samples covering computed columns, sum-of-product, date offsets, and datetime-diff filtering. Version bump 0.1.0-preview.0.2.0 -> 0.1.0-preview.0.3.0. Refs #47.
… semantics Mirrors the date/datetime math operators for the time type with seconds as the unit, restoring symmetry across all temporal types. eachTimeAddSeconds returns timeArrayReturning; eachTimeDiffSeconds returns numericArrayReturning. Wrap-around behaviour at the day boundary is deliberately interpreter- defined. Adds a dedicated "Broadcast vs zip" subsection to CLAUDE.md, README, and CHANGELOG interpreter notes. Explains that any each* slot accepting both *Returning and *ArrayReturning fixes a row count N from the surrounding context, broadcasts scalars to length N, zips arrays element-wise, then applies the operator. Key point: the result is *ArrayReturning even when every operand is scalar (eachAdd(2, 3) over 4 rows yields [5, 5, 5, 5]), which is why eachX cannot be optimized into its single-value sibling. Sample 21 demonstrates eachTimeAddSeconds and eachTimeDiffSeconds over clock_in / clock_out time fields.
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Implements the operator additions discussed in #47.
Summary
unit_price * quantity AS subtotal,sum(unit_price * quantity),order_date + 30 days,shipped_at - ordered_at > 48h).eachAdd/eachSubtract/eachMultiply/eachDividewith the same broadcast-scalar / zip-array polymorphism as0.2.0'seach*comparisons; returnsnumericArrayReturning.eachDateAddDays/eachDateDiffDays(days as the unit).eachDatetimeAddSeconds/eachDatetimeDiffSeconds(seconds as the unit). Larger units expressed via composition witheachMultiply— nointervaltype introduced.CLAUDE.mdrewritten around the "two operator families" model; previously-outdated rules about fields in arithmetic/comparison are replaced with a "where each family fits" table.selectcolumns,sum(eachMultiply(...)), date offsets, and datetime-diff filtering.0.1.0-preview.0.2.0→0.1.0-preview.0.3.0.Closes #47.
Test plan
Draft202012Validator.check_schema)validatejob) goes green on PR