expressions

Type Members

1. case class DynamicFoldableExpression(expr: Expression) extends Expression with DynamicReplacableConstant with Product with Serializable

   

   Wrap any ParamLiteral expression with this so that we can generate literal initialization code within the .init() method of the generated class.

   Wrap any ParamLiteral expression with this so that we can generate literal initialization code within the .init() method of the generated class.
   
   

   We try to locate first foldable expression in a query tree such that all its child is foldable but parent isn't. That way we locate the exact point where an expression is safe to evalute once instead of evaluating every row.
   
   

   Expressions like select c from tab where case col2 when 1 then col3 else 'y' end = 22 like queries doesn't converts literal evaluation into init method.

   expr

   minimal expression tree that can be evaluated only once and turn into a constant.

2. trait DynamicReplacableConstant extends AnyRef

   

3. case class LiteralValue(value: Any, dataType: DataType, position: Int)(converter: (Any) ⇒ Any = createToScalaConverter(dataType)) extends KryoSerializable with Product with Serializable

   

4. class ParamLiteral extends Literal with DynamicReplacableConstant