analysis

Type Members

1. class Analyzer extends RuleExecutor[LogicalPlan] with HiveTypeCoercion

   

   Provides a logical query plan analyzer, which translates UnresolvedAttributes and UnresolvedRelations into fully typed objects using information in a schema Catalog and a FunctionRegistry.

2. trait Catalog extends AnyRef

   

   An interface for looking up relations by name.

   An interface for looking up relations by name. Used by an Analyzer.

3. trait FunctionRegistry extends AnyRef

   

   A catalog for looking up user defined functions, used by an Analyzer.

4. trait HiveTypeCoercion extends AnyRef

   

   A collection of Rules that can be used to coerce differing types that participate in operations into compatible ones.

   A collection of Rules that can be used to coerce differing types that participate in operations into compatible ones. Most of these rules are based on Hive semantics, but they do not introduce any dependencies on the hive codebase. For this reason they remain in Catalyst until we have a more standard set of coercions.

5. trait MultiInstanceRelation extends AnyRef

   

   A trait that should be mixed into query operators where an single instance might appear multiple times in a logical query plan.

   A trait that should be mixed into query operators where an single instance might appear multiple times in a logical query plan. It is invalid to have multiple copies of the same attribute produced by distinct operators in a query tree as this breaks the guarantee that expression ids, which are used to differentiate attributes, are unique.

   Before analysis, all operators that include this trait will be asked to produce a new version of itself with globally unique expression ids.

6. trait OverrideCatalog extends Catalog

   

   A trait that can be mixed in with other Catalogs allowing specific tables to be overridden with new logical plans.

   A trait that can be mixed in with other Catalogs allowing specific tables to be overridden with new logical plans. This can be used to bind query result to virtual tables, or replace tables with in-memory cached versions. Note that the set of overrides is stored in memory and thus lost when the JVM exits.

7. trait OverrideFunctionRegistry extends FunctionRegistry

   

8. type Resolver = (String, String) ⇒ Boolean

   

   Responsible for resolving which identifiers refer to the same entity.

   Responsible for resolving which identifiers refer to the same entity. For example, by using case insensitive equality.

9. class SimpleCatalog extends Catalog

   

10. class SimpleFunctionRegistry extends FunctionRegistry

    

11. case class Star(table: Option[String], mapFunction: (Attribute) ⇒ Expression = identity[Attribute]) extends Attribute with LeafNode[Expression] with Product with Serializable

    

    Represents all of the input attributes to a given relational operator, for example in "SELECT * FROM ...".

    Represents all of the input attributes to a given relational operator, for example in "SELECT * FROM ...".

    table

    an optional table that should be the target of the expansion. If omitted all tables' columns are produced.

12. case class UnresolvedAttribute(name: String) extends Attribute with LeafNode[Expression] with Product with Serializable

    

    Holds the name of an attribute that has yet to be resolved.

13. class UnresolvedException[TreeType <: TreeNode[_]] extends TreeNodeException[TreeType]

    

    Thrown when an invalid attempt is made to access a property of a tree that has yet to be fully resolved.

14. case class UnresolvedFunction(name: String, children: Seq[Expression]) extends Expression with Product with Serializable

    

15. case class UnresolvedRelation(tableIdentifier: Seq[String], alias: Option[String] = None) extends LeafNode with Product with Serializable

    

    Holds the name of a relation that has yet to be looked up in a Catalog.