pub static HIST_DP: LazyLock<SchemaRef>Expand description
HIST_DP — explicit-bucket histogram points.
bucket_counts stays a List<UInt64> rather than being flattened into a
child table: measured, the flat child table is 1.47x the size of the list
column, because a child table pays a 4-byte parent id per bucket where the
list pays one 4-byte offset per point.
bounds_id points at HIST_BOUNDS. Every point of a histogram repeats the
same bucket boundaries — that is what makes it the same histogram — and
interning them measured 1.67x smaller on the point table (410 -> 246 B/row).