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Paul Trowbridge 7006014cc3 Isolate a slice on a blank dimension value instead of widening it
Clicking the blank `partgroup` node under ALTMAN PLANTS selected the customer's
whole $27,588,393.62 (6,851 rows) rather than the $6,198,860.42 (2,421) under
the node clicked -- and the ledger agreed, because the panel totals through the
same filter list the operation writes from. The key was not narrowed, it was
absent, and an absent key means every value of it.

The drop is the engine's: `getCellConfig` builds the click's filter list with
`pivot_value ? [pivot, '==', pivot_value] : undefined`, so a blank group key is
gone before `perspective-click` is dispatched -- and being falsy, so is a
dimension whose value is 0. `cellFilters()` re-derives both axes from
`detail.row.__ROW_PATH__` and the clicked column name instead; the click and a
dragged region now share that one derivation rather than keeping two copies of
the same falsy test.

Both blanks are real here and they are different rows: `partgroup` is null on
51,964 and '' on 111,696. So they stay distinct end to end. `buildWhere` renders
a null as IS NULL, where it used to fall through `esc()` to `= ''` and select
*the other blank* -- the slice naming one node while the operation wrote the
other. In a list the null arm is ORed on, since `IN (NULL)` is never true. The
ledger filters with `is null` rather than `== null`, the engine matching on type
and a null threshold against a string column being the same dropped predicate.

Only `undefined` now means absent, which keeps a subtotal row (a shorter row
path) and a collapsed column level reading as "not part of the slice".

A blank on the *column* axis still cannot be isolated: a column name is its
values joined with '|' and a null joins as the empty string, so the two blanks
are the same text by the time it reaches the client. Those cells are refused
with a message rather than widened.

The panel prints (null) and (blank), and keeps em dash for a column genuinely
absent from the slice -- isolating the blank node and ignoring the column are
opposite statements and read identically before.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
2026-09-22 12:21:06 -04:00
lib Isolate a slice on a blank dimension value instead of widening it 2026-09-22 12:21:06 -04:00
public Add UX mockup and update spec with navigation direction 2026-04-25 14:56:29 -04:00
routes Manage a version's tags as a list, not one entry at a time 2026-09-22 09:00:27 -04:00
setup_sql Land on the forecast somebody chose, not the newest one 2026-09-22 08:34:46 -04:00
ui Isolate a slice on a blank dimension value instead of widening it 2026-09-22 12:21:06 -04:00
.env.example Put the app behind a login 2026-09-14 22:20:25 -04:00
.gitignore Refresh lockfiles and keep .env backups out of the tree 2026-09-16 17:45:58 -04:00
CLAUDE.md Isolate a slice on a blank dimension value instead of widening it 2026-09-22 12:21:06 -04:00
install.sh Put the app behind a login 2026-09-14 22:20:25 -04:00
package-lock.json Refresh lockfiles and keep .env backups out of the tree 2026-09-16 17:45:58 -04:00
package.json Put the app behind a login 2026-09-14 22:20:25 -04:00
PERSPECTIVE.md Filter aggregates with the rest of the layout 2026-09-19 14:43:00 -04:00
pf_perspective_options.md Record DuckDB virtual-server spike findings; choose display-grain pre-aggregation 2026-08-17 21:47:55 -04:00
pf_spec.md Merge feature/static-grain: display-grain pre-aggregation 2026-09-16 18:08:20 -04:00
pf.sh Fix the territory commands' success message and menu order 2026-09-18 11:47:02 -04:00
server.js Clone a version's definition without running it 2026-09-21 10:23:35 -04:00