rusackas commented on code in PR #43909:
URL: https://github.com/apache/superset/pull/43909#discussion_r3943088966
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superset-frontend/packages/superset-ui-core/src/time-format/utils/stringifyTimeInput.ts:
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@@ -28,16 +28,27 @@ export default function stringifyTimeInput(
let time: Date;
if (typeof value === 'string') {
const trimmed = value.trim();
+ // A bare four-digit string is the ISO 8601 year-only form ("2017"), which
+ // every engine parses as January 1st of that year. Any other integer
+ // string is an epoch timestamp in milliseconds that was stringified on
+ // its way here, e.g. by the pivot table, and is not a valid Date input.
+ const isYear = /^\d{4}$/.test(trimmed);
Review Comment:
Good catch @sadpandajoe, thanks! The header coercion in `TableRenderers` now
skips bare four-digit strings so they reach the year handling in core, while
stringified epochs still coerce. Added row and column header tests with a real
`%Y` formatter, both red before this.
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