Package io.cdap.cdap.etl.api.relational

Interface Summary

Interface	Description
Capability	Marker interface that defines various capabilities of the relational engines / expression factories.
Engine	Engine interface provides access to functions common to all relations used in the tranformation request.
Expression	Compiled scalar expression produced by ExpressionFactory.compile(T) that can be passed to various relational algebra calls of Relation objects.
ExpressionFactory<T>	An expression factory for the specific language that can compile expressions into language-independent form to be used in Relation calls.
ExpressionFactoryType<T>	Marker interface for expression factory types denoting expression type.
ExtractableExpression<T>	Expression that can be used to derive a scalar value.
LinearRelationalTransform	Linear variant of RelationalTransform for plugins that has 1 input and produce 1 output relation.
Relation	This class defines a relation that can be transformed in a declarative way using relational algebra calls and expressions.
RelationalTranformContext	This interface provides sql engine, input relation(s) and a way to set tranformation results to a RelationalTransform.transform(RelationalTranformContext) call.
RelationalTransform	An analytical or transformation plugin can implement this interface to provide an alternative declarative way of doing transformations.

Class Summary

Class	Description
InvalidExtractableExpression<T>	Invalid Extractable Expression specification
InvalidRelation

Enum Summary

Enum	Description
CoreExpressionCapabilities	This enum defines core expression factory capabilities
StringExpressionFactoryType	This enum lists expression factory types that compile expressions from String

Exception Summary

Exception	Description
InvalidExtractableExpressionException	This exception is thrown when ExtractableExpression.extract() is called on an invalid expression.