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org.apache.spark.sql.catalyst.optimizer

ReplaceNullWithFalseInPredicate

object ReplaceNullWithFalseInPredicate extends Rule[LogicalPlan]

A rule that replaces Literal(null, BooleanType) with FalseLiteral, if possible, in the search condition of the WHERE/HAVING/ON(JOIN) clauses, which contain an implicit Boolean operator "(search condition) = TRUE". The replacement is only valid when Literal(null, BooleanType) is semantically equivalent to FalseLiteral when evaluating the whole search condition.

Please note that FALSE and NULL are not exchangeable in most cases, when the search condition contains NOT and NULL-tolerant expressions. Thus, the rule is very conservative and applicable in very limited cases.

For example, Filter(Literal(null, BooleanType)) is equal to Filter(FalseLiteral).

Another example containing branches is Filter(If(cond, FalseLiteral, Literal(null, _))); this can be optimized to Filter(If(cond, FalseLiteral, FalseLiteral)), and eventually Filter(FalseLiteral).

Moreover, this rule also transforms predicates in all If expressions as well as branch conditions in all CaseWhen expressions, even if they are not part of the search conditions.

For example, Project(If(And(cond, Literal(null)), Literal(1), Literal(2))) can be simplified into Project(Literal(2)).

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  1. final def !=(arg0: Any): Boolean
    Definition Classes
    AnyRef → Any
  2. final def ##(): Int
    Definition Classes
    AnyRef → Any
  3. final def ==(arg0: Any): Boolean
    Definition Classes
    AnyRef → Any
  4. def apply(plan: LogicalPlan): LogicalPlan
    Definition Classes
    ReplaceNullWithFalseInPredicate → Rule
  5. final def asInstanceOf[T0]: T0
    Definition Classes
    Any
  6. def clone(): AnyRef
    Attributes
    protected[lang]
    Definition Classes
    AnyRef
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    @throws( ... ) @native()
  7. final def eq(arg0: AnyRef): Boolean
    Definition Classes
    AnyRef
  8. def equals(arg0: Any): Boolean
    Definition Classes
    AnyRef → Any
  9. def finalize(): Unit
    Attributes
    protected[lang]
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    AnyRef
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    @throws( classOf[java.lang.Throwable] )
  10. final def getClass(): Class[_]
    Definition Classes
    AnyRef → Any
    Annotations
    @native()
  11. def hashCode(): Int
    Definition Classes
    AnyRef → Any
    Annotations
    @native()
  12. def initializeLogIfNecessary(isInterpreter: Boolean, silent: Boolean): Boolean
    Attributes
    protected
    Definition Classes
    Logging
  13. def initializeLogIfNecessary(isInterpreter: Boolean): Unit
    Attributes
    protected
    Definition Classes
    Logging
  14. final def isInstanceOf[T0]: Boolean
    Definition Classes
    Any
  15. def isTraceEnabled(): Boolean
    Attributes
    protected
    Definition Classes
    Logging
  16. def log: Logger
    Attributes
    protected
    Definition Classes
    Logging
  17. def logDebug(msg: ⇒ String, throwable: Throwable): Unit
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    protected
    Definition Classes
    Logging
  18. def logDebug(msg: ⇒ String): Unit
    Attributes
    protected
    Definition Classes
    Logging
  19. def logError(msg: ⇒ String, throwable: Throwable): Unit
    Attributes
    protected
    Definition Classes
    Logging
  20. def logError(msg: ⇒ String): Unit
    Attributes
    protected
    Definition Classes
    Logging
  21. def logInfo(msg: ⇒ String, throwable: Throwable): Unit
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    protected
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    Logging
  22. def logInfo(msg: ⇒ String): Unit
    Attributes
    protected
    Definition Classes
    Logging
  23. def logName: String
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    protected
    Definition Classes
    Logging
  24. def logTrace(msg: ⇒ String, throwable: Throwable): Unit
    Attributes
    protected
    Definition Classes
    Logging
  25. def logTrace(msg: ⇒ String): Unit
    Attributes
    protected
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    Logging
  26. def logWarning(msg: ⇒ String, throwable: Throwable): Unit
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  27. def logWarning(msg: ⇒ String): Unit
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    protected
    Definition Classes
    Logging
  28. final def ne(arg0: AnyRef): Boolean
    Definition Classes
    AnyRef
  29. final def notify(): Unit
    Definition Classes
    AnyRef
    Annotations
    @native()
  30. final def notifyAll(): Unit
    Definition Classes
    AnyRef
    Annotations
    @native()
  31. val ruleName: String

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

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

    Definition Classes
    Rule
  32. final def synchronized[T0](arg0: ⇒ T0): T0
    Definition Classes
    AnyRef
  33. def toString(): String
    Definition Classes
    AnyRef → Any
  34. final def wait(): Unit
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    AnyRef
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    @throws( ... )
  35. final def wait(arg0: Long, arg1: Int): Unit
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    @throws( ... )
  36. final def wait(arg0: Long): Unit
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    @throws( ... ) @native()

Inherited from Rule[LogicalPlan]

Inherited from Logging

Inherited from AnyRef

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