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feat(capabilities): wire extract/extract_boolean, strptime_timestamp.timezone, retire MA duplicates #290

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discreteds merged 1 commit into from
Aug 15, 2026
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feat(capabilities): wire extract/extract_boolean, strptime_timestamp.timezone, retire MA duplicates #290

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51 changes: 50 additions & 1 deletion docs/reference/expression-coverage-scoped.md
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Original file line number Diff line number Diff line change
Expand Up @@ -5,7 +5,7 @@

Scoped deviations — dialect, parameter, option, value-class; function-level coverage and matrices live in [`expression-coverage.md`](expression-coverage.md).

Declarations: 39 · Facts: 1509 · Registered operations: 324 · Implementation records: 972
Declarations: 42 · Facts: 1558 · Registered operations: 324 · Implementation records: 972

Legend — scoped deviations:

Expand Down Expand Up @@ -963,6 +963,50 @@ Legend — scoped deviations:
| * | timezone | — | iana_timezone | unsupported | gate | build | — | assume_timezone silently drops the timezone (returns a naive timestamp) — the tz argument is ignored; only polars attaches the timezone | — | — | 2026-07-25 | — | — |
| ibis-duckdb | timezone | — | iana_timezone | unsupported | gate | build | — | assume_timezone silently drops the timezone (returns a naive timestamp) — the tz argument is ignored; only polars attaches the timezone | — | — | 2026-07-25 | — | — |

### `EXTRACT` × polars (FKEY_SUBSTRAIT_SCALAR_DATETIME)

| Dialect | Param | Option values | Value class | Level | Enforcement | Boundary | Condition | Message | Workaround | Upstream | Since | Native errors | Probe-exempt |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| polars | component | MONDAY_WEEK, PICOSECOND, SUNDAY_WEEK, TIMEZONE_OFFSET, US_WEEK, US_YEAR | — | unsupported | gate | build | — | the native backend has no primitive for this extract component (verified by semantic probe; see capabilities/datetime/extract.py) | — | — | 2026-08-15 | — | — |

### `EXTRACT` × narwhals (FKEY_SUBSTRAIT_SCALAR_DATETIME)

| Dialect | Param | Option values | Value class | Level | Enforcement | Boundary | Condition | Message | Workaround | Upstream | Since | Native errors | Probe-exempt |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| narwhals-pandas | component | ISO_WEEK, ISO_YEAR, MONDAY_WEEK, PICOSECOND, SUNDAY_WEEK, TIMEZONE_OFFSET, UNIX_TIME, US_WEEK, US_YEAR | — | unsupported | gate | build | — | the native backend has no primitive for this extract component (verified by semantic probe; see capabilities/datetime/extract.py) | — | — | 2026-08-15 | — | — |
| narwhals-polars | component | ISO_WEEK, ISO_YEAR, MONDAY_WEEK, PICOSECOND, SUNDAY_WEEK, TIMEZONE_OFFSET, UNIX_TIME, US_WEEK, US_YEAR | — | unsupported | gate | build | — | the native backend has no primitive for this extract component (verified by semantic probe; see capabilities/datetime/extract.py) | — | — | 2026-08-15 | — | — |

### `EXTRACT` × ibis (FKEY_SUBSTRAIT_SCALAR_DATETIME)

| Dialect | Param | Option values | Value class | Level | Enforcement | Boundary | Condition | Message | Workaround | Upstream | Since | Native errors | Probe-exempt |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| * | component | MONDAY_WEEK, NANOSECOND, PICOSECOND, SUNDAY_WEEK, TIMEZONE_OFFSET, US_WEEK, US_YEAR | — | unsupported | gate | build | — | the native backend has no primitive for this extract component (verified by semantic probe; see capabilities/datetime/extract.py) | — | — | 2026-08-15 | — | — |
| * | timezone | — | iana_timezone | unsupported | gate | build | — | ibis has no timezone primitives; extract/extract_boolean's timezone option is silently ignored (the local component is read from the stored value, not the target zone) -- see capabilities/datetime/extract.py | — | — | 2026-08-15 | — | — |
| ibis-duckdb | component | MONDAY_WEEK, NANOSECOND, PICOSECOND, SUNDAY_WEEK, TIMEZONE_OFFSET, US_WEEK, US_YEAR | — | unsupported | gate | build | — | the native backend has no primitive for this extract component (verified by semantic probe; see capabilities/datetime/extract.py) | — | — | 2026-08-15 | — | — |
| ibis-duckdb | timezone | — | iana_timezone | unsupported | gate | build | — | ibis has no timezone primitives; extract/extract_boolean's timezone option is silently ignored (the local component is read from the stored value, not the target zone) -- see capabilities/datetime/extract.py | — | — | 2026-08-15 | — | — |

### `EXTRACT_BOOLEAN` × polars (FKEY_SUBSTRAIT_SCALAR_DATETIME)

| Dialect | Param | Option values | Value class | Level | Enforcement | Boundary | Condition | Message | Workaround | Upstream | Since | Native errors | Probe-exempt |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| polars | component | IS_DST | — | unsupported | gate | build | — | extract_boolean(IS_DST) is a placeholder (constant False) on all backends; deferred to backlog item 65 (is-dst-placeholder-implementation) | — | — | 2026-08-15 | — | — |

### `EXTRACT_BOOLEAN` × narwhals (FKEY_SUBSTRAIT_SCALAR_DATETIME)

| Dialect | Param | Option values | Value class | Level | Enforcement | Boundary | Condition | Message | Workaround | Upstream | Since | Native errors | Probe-exempt |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| narwhals-pandas | component | IS_DST | — | unsupported | gate | build | — | extract_boolean(IS_DST) is a placeholder (constant False) on all backends; deferred to backlog item 65 (is-dst-placeholder-implementation) | — | — | 2026-08-15 | — | — |
| narwhals-polars | component | IS_DST | — | unsupported | gate | build | — | extract_boolean(IS_DST) is a placeholder (constant False) on all backends; deferred to backlog item 65 (is-dst-placeholder-implementation) | — | — | 2026-08-15 | — | — |

### `EXTRACT_BOOLEAN` × ibis (FKEY_SUBSTRAIT_SCALAR_DATETIME)

| Dialect | Param | Option values | Value class | Level | Enforcement | Boundary | Condition | Message | Workaround | Upstream | Since | Native errors | Probe-exempt |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| * | component | IS_DST | — | unsupported | gate | build | — | extract_boolean(IS_DST) is a placeholder (constant False) on all backends; deferred to backlog item 65 (is-dst-placeholder-implementation) | — | — | 2026-08-15 | — | — |
| * | timezone | — | iana_timezone | unsupported | gate | build | — | ibis has no timezone primitives; extract/extract_boolean's timezone option is silently ignored (the local component is read from the stored value, not the target zone) -- see capabilities/datetime/extract.py | — | — | 2026-08-15 | — | — |
| ibis-duckdb | component | IS_DST | — | unsupported | gate | build | — | extract_boolean(IS_DST) is a placeholder (constant False) on all backends; deferred to backlog item 65 (is-dst-placeholder-implementation) | — | — | 2026-08-15 | — | — |
| ibis-duckdb | timezone | — | iana_timezone | unsupported | gate | build | — | ibis has no timezone primitives; extract/extract_boolean's timezone option is silently ignored (the local component is read from the stored value, not the target zone) -- see capabilities/datetime/extract.py | — | — | 2026-08-15 | — | — |

### `LOCAL_TIMESTAMP` × ibis (FKEY_SUBSTRAIT_SCALAR_DATETIME)

| Dialect | Param | Option values | Value class | Level | Enforcement | Boundary | Condition | Message | Workaround | Upstream | Since | Native errors | Probe-exempt |
Expand Down Expand Up @@ -994,6 +1038,11 @@ Legend — scoped deviations:
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| ibis-sqlite | * | — | — | unsupported | gate | build | — | ibis-sqlite has no compilation rule for StringToDate/StringToTimestamp (OperationNotDefinedError); format-driven parsing is unavailable on this dialect, so it is gated rather than left to fail natively | — | — | 2026-07-30 | — | whole-op gate on a WILDCARD_PARAM fact; cannot be keyed on an OpSpec param (OpSpecs are indexed by concrete argument name) — verified by the dedicated cross-backend gate tests in test_datetime_strptime_format.py |

| Dialect | Param | Option values | Value class | Level | Enforcement | Boundary | Condition | Message | Workaround | Upstream | Since | Native errors | Probe-exempt |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| * | timezone | — | iana_timezone | unsupported | gate | build | — | strptime_timestamp silently drops the timezone (returns a naive timestamp) on ibis -- ibis has no timezone primitives, matching assume_timezone/to_timezone/local_timestamp/extract.timezone | — | — | 2026-08-15 | — | — |
| ibis-duckdb | timezone | — | iana_timezone | unsupported | gate | build | — | strptime_timestamp silently drops the timezone (returns a naive timestamp) on ibis -- ibis has no timezone primitives, matching assume_timezone/to_timezone/local_timestamp/extract.timezone | — | — | 2026-08-15 | — | — |

### `CAPITALIZE` × polars (FKEY_SUBSTRAIT_SCALAR_STRING)

| Dialect | Param | Option values | Value class | Level | Enforcement | Boundary | Condition | Message | Workaround | Upstream | Since | Native errors | Probe-exempt |
Expand Down
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