R6 csv empty sym#194

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singaraiona wants to merge 9 commits intomasterfrom

r6-csv-empty-sym

Commits on May 5, 2026

fix(query): collapse scalar agg without `by:` to ONE row
singaraiona
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perf(ops): ClickBench bottleneck fixes — top-K, grouped count(distinct), LIKE on dict SYM
singaraiona
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fix(io/csv): empty SYM fields no longer become the null sentinel
singaraiona
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perf(query): broadcast atom literals in select dict without per-group LIST
singaraiona
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perf(eval): SIMD-friendly fast path for (== or !=) of SYM-vec vs SYM atom
singaraiona
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perf(group): per-group-slice for low-cardinality grouped count(distinct)
singaraiona
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perf(group): parallel partitioned grouped count(distinct) kernel
singaraiona
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perf(query): parallel row→gid probe for non-agg scatter
singaraiona
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fix(group)+perf(query): correct parallel grouped count(distinct), and let count(distinct col) ride path A
singaraiona
committed