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object ExprUtils

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  1. def applyAndOperator[T](a: Option[T], b: Option[T], f: (T, T) ⇒ T): Option[T]

    Apply an and operator on Optional parameters, in case one of them is None the non None parameter is returned

    Apply an and operator on Optional parameters, in case one of them is None the non None parameter is returned

    f

    the operator to be applied

  2. def applyOrOperator[T](a: Option[T], b: Option[T], f: (T, T) ⇒ T): Option[T]

    Apply an or operator on Optional parameters, the operator is applied only if both parameters are defined

    Apply an or operator on Optional parameters, the operator is applied only if both parameters are defined

    f

    the operator to be applied

  3. def catalystExprToWrappedExpr(expr: Expression): MetadataWrappedExpression

    Converts a catalyst expression to a wrapped expression (recursively)

    Converts a catalyst expression to a wrapped expression (recursively)

    expr

    the catalyst expression to be converted

    returns

    the resulting wrapped expression

    Note

    It's assumed the boolean-operator prefix of the expression tree (that is, from the root down, stopping on non-boolean-operator nodes) is in NNF Form. this is extremely important, since the variant of GenClause and MergeClause used here fail when the NNF condition is not met (simple example (NOT(NOT(X < 5)).