Exam Bundle

One child row appears per array element with expected null behavior would demonstrate the separate action Use `explode` or `explode_outer` according to null retention requirements, which addresses “Nested arrays must become normalized child rows for downstream grouping.” It does not verify the requirement “Several DataFrame operations are used repeatedly by other jobs” following Encapsulate them in a pure reusable transform function.

The physical plan includes a distributed filter pertains to a different control (Use DataFrame `.filter()` or `.where()` with a Spark column expression) and a different need (A business predicate must filter rows without collecting the dataset to the driver). It cannot establish that Encapsulate them in a pure reusable transform function met the stated goal.

The output schema includes the derived field and preserves others would demonstrate the separate action Use `.withColumn()` with a supported column expression, which addresses “A new derived column is needed without replacing other columns.” It does not verify the requirement “Several DataFrame operations are used repeatedly by other jobs” following Encapsulate them in a pure reusable transform function.

Maintain stable surrogate keys and explicit natural-key mapping belongs to the separate case “A dimension rekeying event should not invalidate existing fact foreign keys,” where Historical facts still resolve to the intended dimension members would be expected. That differs from the condition in this stem: “Historical order facts must use the product attribute version valid at event time.”

This action solves a different issue: “An early fact arrives before the referenced dimension record exists.” Its normal signal is The fact retains referential traceability and resolves after dimension arrival. Here the requested behavior is “Historical order facts must use the product attribute version valid at event time,” so that signal is not sufficient.

Maintain an SCD1 current-state dimension belongs to the separate case “Only the latest customer dimension row is required for operational current-state reporting,” where One current row per customer reflects the latest accepted update would be expected. That differs from the condition in this stem: “Historical order facts must use the product attribute version valid at event time.”

That observation is a valid indicator for “Only the latest customer dimension row is required for operational current-state reporting” when using Maintain an SCD1 current-state dimension. The scenario instead tests “Historical order facts must use the product attribute version valid at event time”; the relevant result is The fact matches the product description valid on its transaction date.

Only the intended effective-date interval reflects the corrected attribute would demonstrate the separate action Apply a scoped corrected dimension version with appropriate validity handling, which addresses “A dimension attribute correction must not rewrite unaffected historical event timestamps.” It does not verify the requirement “Historical order facts must use the product attribute version valid at event time” following Use SCD2 effective-start and end intervals in an as-of join.

Historical facts still resolve to the intended dimension members pertains to a different control (Maintain stable surrogate keys and explicit natural-key mapping) and a different need (A dimension rekeying event should not invalidate existing fact foreign keys). It cannot establish that Use SCD2 effective-start and end intervals in an as-of join met the stated goal.

This action solves a different issue: “An early fact arrives before the referenced dimension record exists.” Its normal signal is The fact retains referential traceability and resolves after dimension arrival. Here the requested behavior is “Only the latest customer dimension row is required for operational current-state reporting,” so that signal is not sufficient.

Apply a scoped corrected dimension version with appropriate validity handling is appropriate when “A dimension attribute correction must not rewrite unaffected historical event timestamps”; it would be verified by Only the intended effective-date interval reflects the corrected attribute. It does not directly satisfy “Only the latest customer dimension row is required for operational current-state reporting,” whose relevant acceptance evidence is One current row per customer reflects the latest accepted update.

Use SCD2 effective-start and end intervals in an as-of join belongs to the separate case “Historical order facts must use the product attribute version valid at event time,” where The fact matches the product description valid on its transaction date would be expected. That differs from the condition in this stem: “Only the latest customer dimension row is required for operational current-state reporting.”

This signal belongs to the adjacent case “Historical order facts must use the product attribute version valid at event time,” whose remedy is Use SCD2 effective-start and end intervals in an as-of join. The observed result for the present requirement is One current row per customer reflects the latest accepted update.

Historical facts still resolve to the intended dimension members would demonstrate the separate action Maintain stable surrogate keys and explicit natural-key mapping, which addresses “A dimension rekeying event should not invalidate existing fact foreign keys.” It does not verify the requirement “Only the latest customer dimension row is required for operational current-state reporting” following Maintain an SCD1 current-state dimension.

This signal belongs to the adjacent case “An early fact arrives before the referenced dimension record exists,” whose remedy is Use an explicit unknown-member strategy or delayed reconciliation. The observed result for the present requirement is One current row per customer reflects the latest accepted update.

This action solves a different issue: “A dimension attribute correction must not rewrite unaffected historical event timestamps.” Its normal signal is Only the intended effective-date interval reflects the corrected attribute. Here the requested behavior is “A dimension rekeying event should not invalidate existing fact foreign keys,” so that signal is not sufficient.

Use an explicit unknown-member strategy or delayed reconciliation is appropriate when “An early fact arrives before the referenced dimension record exists”; it would be verified by The fact retains referential traceability and resolves after dimension arrival. It does not directly satisfy “A dimension rekeying event should not invalidate existing fact foreign keys,” whose relevant acceptance evidence is Historical facts still resolve to the intended dimension members.

This action solves a different issue: “Historical order facts must use the product attribute version valid at event time.” Its normal signal is The fact matches the product description valid on its transaction date. Here the requested behavior is “A dimension rekeying event should not invalidate existing fact foreign keys,” so that signal is not sufficient.

The fact matches the product description valid on its transaction date pertains to a different control (Use SCD2 effective-start and end intervals in an as-of join) and a different need (Historical order facts must use the product attribute version valid at event time). It cannot establish that Maintain stable surrogate keys and explicit natural-key mapping met the stated goal.

That observation is a valid indicator for “Only the latest customer dimension row is required for operational current-state reporting” when using Maintain an SCD1 current-state dimension. The scenario instead tests “A dimension rekeying event should not invalidate existing fact foreign keys”; the relevant result is Historical facts still resolve to the intended dimension members.

Only the intended effective-date interval reflects the corrected attribute would demonstrate the separate action Apply a scoped corrected dimension version with appropriate validity handling, which addresses “A dimension attribute correction must not rewrite unaffected historical event timestamps.” It does not verify the requirement “A dimension rekeying event should not invalidate existing fact foreign keys” following Maintain stable surrogate keys and explicit natural-key mapping.

The alternative Apply a scoped corrected dimension version with appropriate validity handling has a distinct purpose—A dimension attribute correction must not rewrite unaffected historical event timestamps. It would not establish the required outcome (An early fact arrives before the referenced dimension record exists); the necessary verification concerns The fact retains referential traceability and resolves after dimension arrival.

The alternative Use SCD2 effective-start and end intervals in an as-of join has a distinct purpose—Historical order facts must use the product attribute version valid at event time. It would not establish the required outcome (An early fact arrives before the referenced dimension record exists); the necessary verification concerns The fact retains referential traceability and resolves after dimension arrival.

This action solves a different issue: “A dimension rekeying event should not invalidate existing fact foreign keys.” Its normal signal is Historical facts still resolve to the intended dimension members. Here the requested behavior is “An early fact arrives before the referenced dimension record exists,” so that signal is not sufficient.

This signal belongs to the adjacent case “Historical order facts must use the product attribute version valid at event time,” whose remedy is Use SCD2 effective-start and end intervals in an as-of join. The observed result for the present requirement is The fact retains referential traceability and resolves after dimension arrival.

That observation is a valid indicator for “Only the latest customer dimension row is required for operational current-state reporting” when using Maintain an SCD1 current-state dimension. The scenario instead tests “An early fact arrives before the referenced dimension record exists”; the relevant result is The fact retains referential traceability and resolves after dimension arrival.

This signal belongs to the adjacent case “A dimension attribute correction must not rewrite unaffected historical event timestamps,” whose remedy is Apply a scoped corrected dimension version with appropriate validity handling. The observed result for the present requirement is The fact retains referential traceability and resolves after dimension arrival.

Maintain stable surrogate keys and explicit natural-key mapping is appropriate when “A dimension rekeying event should not invalidate existing fact foreign keys”; it would be verified by Historical facts still resolve to the intended dimension members. It does not directly satisfy “A dimension attribute correction must not rewrite unaffected historical event timestamps,” whose relevant acceptance evidence is Only the intended effective-date interval reflects the corrected attribute.

The alternative Use an explicit unknown-member strategy or delayed reconciliation has a distinct purpose—An early fact arrives before the referenced dimension record exists. It would not establish the required outcome (A dimension attribute correction must not rewrite unaffected historical event timestamps); the necessary verification concerns Only the intended effective-date interval reflects the corrected attribute.

The alternative Use SCD2 effective-start and end intervals in an as-of join has a distinct purpose—Historical order facts must use the product attribute version valid at event time. It would not establish the required outcome (A dimension attribute correction must not rewrite unaffected historical event timestamps); the necessary verification concerns Only the intended effective-date interval reflects the corrected attribute.

This signal belongs to the adjacent case “A dimension rekeying event should not invalidate existing fact foreign keys,” whose remedy is Maintain stable surrogate keys and explicit natural-key mapping. The observed result for the present requirement is Only the intended effective-date interval reflects the corrected attribute.

The fact retains referential traceability and resolves after dimension arrival pertains to a different control (Use an explicit unknown-member strategy or delayed reconciliation) and a different need (An early fact arrives before the referenced dimension record exists). It cannot establish that Apply a scoped corrected dimension version with appropriate validity handling met the stated goal.

This signal belongs to the adjacent case “Historical order facts must use the product attribute version valid at event time,” whose remedy is Use SCD2 effective-start and end intervals in an as-of join. The observed result for the present requirement is Only the intended effective-date interval reflects the corrected attribute.