Package org.apache.calcite.sql2rel

Translates a SQL parse tree to relational expression.

Interface Summary

Interface	Description
AuxiliaryConverter	Converts an expression for a group window function (e.g.
InitializerContext	Provides context for InitializerExpressionFactory methods.
InitializerExpressionFactory	InitializerExpressionFactory supplies default values for INSERT, UPDATE, and NEW.
RelStructuredTypeFlattener.SelfFlatteningRel	Mix-in interface for relational expressions that know how to flatten themselves.
SqlNodeToRexConverter	Converts expressions from SqlNode to RexNode.
SqlRexContext	Contains the context necessary for a SqlRexConvertlet to convert a SqlNode expression into a RexNode.
SqlRexConvertlet	Thunk which converts a SqlNode expression into a RexNode expression.
SqlRexConvertletTable	Collection of SqlRexConvertlets.
SqlToRelConverter.Config	Interface to define the configuration for a SqlToRelConverter.
SubQueryConverter	SubQueryConverter provides the interface for classes that convert sub-queries into equivalent expressions.

Class Summary

Class	Description
AuxiliaryConverter.Impl	Simple implementation of AuxiliaryConverter.
CorrelationReferenceFinder	Shuttle that finds references to a given CorrelationId within a tree of RelNodes.
CorrelationReferenceFinder.MyRexVisitor	Replaces alternative names of correlation variable to its canonical name.
DeduplicateCorrelateVariables	Rewrites relations to ensure the same correlation is referenced by the same correlation variable.
DeduplicateCorrelateVariables.DeduplicateCorrelateVariablesShuttle	Replaces alternative names of correlation variable to its canonical name.
NullInitializerExpressionFactory	An implementation of InitializerExpressionFactory that always supplies NULL.
ReflectiveConvertletTable	Implementation of SqlRexConvertletTable which uses reflection to call any method of the form public RexNode convertXxx(ConvertletContext, SqlNode) or public RexNode convertXxx(ConvertletContext, SqlOperator, SqlCall).
RelDecorrelator	RelDecorrelator replaces all correlated expressions (corExp) in a relational expression (RelNode) tree with non-correlated expressions that are produced from joining the RelNode that produces the corExp with the RelNode that references it.
RelDecorrelator.CorDef	A correlation and a field.
RelDecorrelator.CorelMap	A map of the locations of LogicalCorrelate in a tree of RelNodes.
RelDecorrelator.CorelMapBuilder	Builds a RelDecorrelator.CorelMap.
RelDecorrelator.CorRef	A unique reference to a correlation field.
RelDecorrelator.DecorrelateRexShuttle	Shuttle that decorrelates.
RelDecorrelator.Frame	Frame describing the relational expression after decorrelation and where to find the output fields and correlation variables among its output fields.
RelFieldTrimmer	Transformer that walks over a tree of relational expressions, replacing each RelNode with a 'slimmed down' relational expression that projects only the columns required by its consumer.
RelFieldTrimmer.TrimResult	Result of an attempt to trim columns from a relational expression.
RelStructuredTypeFlattener	RelStructuredTypeFlattener removes all structured types from a tree of relational expressions.
SqlNodeToRexConverterImpl	Standard implementation of SqlNodeToRexConverter.
SqlToRelConverter	Converts a SQL parse tree (consisting of SqlNode objects) into a relational algebra expression (consisting of RelNode objects).
SqlToRelConverter.AggregateFinder	Visitor that collects all aggregate functions in a SqlNode tree.
SqlToRelConverter.ConfigBuilder	Builder for a SqlToRelConverter.Config.
SqlToRelConverter.ConfigImpl	Implementation of SqlToRelConverter.Config.
SqlToRelConverter.CorrelationUse	Use of a row as a correlating variable by a given relational expression.
SqlToRelConverter.DeferredLookup	Deferred lookup.
SqlToRelConverter.LookupContext	Context to find a relational expression to a field offset.
SqlToRelConverter.SubQuery	A sub-query, whether it needs to be translated using 2- or 3-valued logic.
StandardConvertletTable	Standard implementation of SqlRexConvertletTable.
StandardConvertletTable.AvgVarianceConvertlet	Convertlet that handles AVG and VARIANCE windowed aggregate functions.
StandardConvertletTable.GreatestConvertlet	Convertlet that converts GREATEST and LEAST.
StandardConvertletTable.RegrCovarianceConvertlet	Convertlet that handles COVAR_POP, COVAR_SAMP, REGR_SXX, REGR_SYY windowed aggregate functions.
StandardConvertletTable.TimestampAddConvertlet	Convertlet that handles the TIMESTAMPADD function.
StandardConvertletTable.TimestampDiffConvertlet	Convertlet that handles the TIMESTAMPDIFF function.
StandardConvertletTable.TrimConvertlet	Convertlet that converts LTRIM and RTRIM to TRIM.