Perf/clickbench improvements#220
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The fused multi-key path already accepts a NULL predicate; only the planner gate required where_expr. Allow no-WHERE when n_keys >= 2 AND count-only. Single-key no-WHERE and multi-agg over near-unique composites stay on exec_group's radix — fusing them regresses at very high cardinality. ClickBench 10M: q16 744 → 154 ms total 8.0 → 7.3 s Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
mk_compile packs the composite by-key into a 16-byte slot. An I64
column for minute() (values 0..59) blows the budget on q18's
{UserID, minute, SearchPhrase} composite (~20 bytes) and the query
drops to exec_group.
After eval'ing a computed by-val whose AST head is minute / hh / ss /
dd / dow / mm / doy / yyyy, downcast the I64 result to I16 before
adding it to the table. I16 is the smallest type that holds every
output range (year up to 32767, doy up to 366) and still prints as
decimal (U8 prints hex, unreadable for a minute value).
Skipped when the source column has nulls.
ClickBench 10M:
q18 1748 → 449 ms
total 6.6 → 5.2 s
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
perf(query): fuse no-WHERE multi-key count-only group-by
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