Object

org.apache.spark.sql.catalyst.analysis.Analyzer

FixNullability

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object FixNullability extends Rule[LogicalPlan]

Fixes nullability of Attributes in a resolved LogicalPlan by using the nullability of corresponding Attributes of its children output Attributes. This step is needed because users can use a resolved AttributeReference in the Dataset API and outer joins can change the nullability of an AttribtueReference. Without the fix, a nullable column's nullable field can be actually set as non-nullable, which cause illegal optimization (e.g., NULL propagation) and wrong answers. See SPARK-13484 and SPARK-13801 for the concrete queries of this case.

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Rule[LogicalPlan], internal.Logging, AnyRef, Any
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  1. final def !=(arg0: Any): Boolean

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  2. final def ##(): Int

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  3. final def ==(arg0: Any): Boolean

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  4. def apply(plan: LogicalPlan): LogicalPlan

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    FixNullability → Rule

  5. final def asInstanceOf[T0]: T0

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  6. def clone(): AnyRef

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  7. final def eq(arg0: AnyRef): Boolean

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  8. def equals(arg0: Any): Boolean

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  9. def finalize(): Unit

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  10. final def getClass(): Class[_]

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  11. def hashCode(): Int

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  12. def initializeLogIfNecessary(isInterpreter: Boolean, silent: Boolean = false): Boolean

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    Logging

  13. def initializeLogIfNecessary(isInterpreter: Boolean): Unit

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  14. final def isInstanceOf[T0]: Boolean

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  15. def isTraceEnabled(): Boolean

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    Logging

  16. def log: Logger

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  17. def logDebug(msg: ⇒ String, throwable: Throwable): Unit

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  18. def logDebug(msg: ⇒ String): Unit

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  19. def logError(msg: ⇒ String, throwable: Throwable): Unit

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  20. def logError(msg: ⇒ String): Unit

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  21. def logInfo(msg: ⇒ String, throwable: Throwable): Unit

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  22. def logInfo(msg: ⇒ String): Unit

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  23. def logName: String

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  24. def logTrace(msg: ⇒ String, throwable: Throwable): Unit

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  25. def logTrace(msg: ⇒ String): Unit

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  26. def logWarning(msg: ⇒ String, throwable: Throwable): Unit

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  27. def logWarning(msg: ⇒ String): Unit

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  28. final def ne(arg0: AnyRef): Boolean

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  29. final def notify(): Unit

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  30. final def notifyAll(): Unit

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  31. val ruleName: String

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    Name for this rule, automatically inferred based on class name.

    Name for this rule, automatically inferred based on class name.

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  32. final def synchronized[T0](arg0: ⇒ T0): T0

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  33. def toString(): String

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  34. final def wait(): Unit

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  35. final def wait(arg0: Long, arg1: Int): Unit

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  36. final def wait(arg0: Long): Unit

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Inherited from Rule[LogicalPlan]

Inherited from internal.Logging

Inherited from AnyRef

Inherited from Any

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