PredicateHelper Scala Trait

PredicateHelper defines the methods that are used to work with predicates (mainly).

Table 1. PredicateHelper’s Methods
Method	Description
splitConjunctivePredicates
splitDisjunctivePredicates
replaceAlias
canEvaluate
canEvaluateWithinJoin

splitConjunctivePredicates(condition: Expression): Seq[Expression]

splitConjunctivePredicates takes the input condition expression and splits it to two expressions if they are children of a And binary expression.

splitConjunctivePredicates splits the child expressions recursively down the child expressions until no conjunctive And binary expressions exist.

splitDisjunctivePredicates(condition: Expression): Seq[Expression]

splitDisjunctivePredicates…FIXME

Note	`splitDisjunctivePredicates` is used when…FIXME

replaceAlias(
  condition: Expression,
  aliases: AttributeMap[Expression]): Expression

replaceAlias…FIXME

Note	`replaceAlias` is used when…FIXME

canEvaluate(expr: Expression, plan: LogicalPlan): Boolean

canEvaluate…FIXME

Note	`canEvaluate` is used when…FIXME

canEvaluateWithinJoin(expr: Expression): Boolean

canEvaluateWithinJoin indicates whether a Catalyst expression can be evaluated within a join, i.e. when one of the following conditions holds:

Note	`canEvaluateWithinJoin` is used when: `PushPredicateThroughJoin` logical optimization rule is executed `ReorderJoin` logical optimization rule does createOrderedJoin

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