org.apache.drill.exec.expr

Class ExpressionTreeMaterializer

java.lang.Object

org.apache.drill.exec.expr.ExpressionTreeMaterializer

public class ExpressionTreeMaterializer
extends Object

Method Summary

Modifier and Type	Method and Description
static LogicalExpression	addCastExpression(LogicalExpression fromExpr, TypeProtos.MajorType toType, FunctionLookupContext functionLookupContext, ErrorCollector errorCollector)
static LogicalExpression	addCastExpression(LogicalExpression fromExpr, TypeProtos.MajorType toType, FunctionLookupContext functionLookupContext, ErrorCollector errorCollector, boolean exactResolver)
static LogicalExpression	convertToNullableType(LogicalExpression fromExpr, TypeProtos.MinorType toType, FunctionLookupContext functionLookupContext, ErrorCollector errorCollector)
static LogicalExpression	materialize(LogicalExpression expr, Map<VectorAccessible,BatchReference> batches, ErrorCollector errorCollector, FunctionLookupContext functionLookupContext, boolean allowComplexWriterExpr, boolean unionTypeEnabled) Materializes logical expression taking into account passed parameters.
static LogicalExpression	materialize(LogicalExpression expr, VectorAccessible batch, ErrorCollector errorCollector, FunctionLookupContext functionLookupContext)
static LogicalExpression	materialize(LogicalExpression expr, VectorAccessible batch, ErrorCollector errorCollector, FunctionLookupContext functionLookupContext, boolean allowComplexWriterExpr)
static LogicalExpression	materialize(LogicalExpression expr, VectorAccessible batch, ErrorCollector errorCollector, FunctionLookupContext functionLookupContext, boolean allowComplexWriterExpr, boolean unionTypeEnabled) Materializes logical expression taking into account passed parameters.
static LogicalExpression	materializeAndCheckErrors(LogicalExpression expr, VectorAccessible batch, FunctionLookupContext functionLookupContext)
static LogicalExpression	materializeFilterExpr(LogicalExpression expr, TupleMetadata fieldTypes, ErrorCollector errorCollector, FunctionLookupContext functionLookupContext)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Detail

materialize

public static LogicalExpression materialize(LogicalExpression expr,
                                            VectorAccessible batch,
                                            ErrorCollector errorCollector,
                                            FunctionLookupContext functionLookupContext)

materializeAndCheckErrors

public static LogicalExpression materializeAndCheckErrors(LogicalExpression expr,
                                                          VectorAccessible batch,
                                                          FunctionLookupContext functionLookupContext)
                                                   throws SchemaChangeException

Throws:

SchemaChangeException

materialize

public static LogicalExpression materialize(LogicalExpression expr,
                                            VectorAccessible batch,
                                            ErrorCollector errorCollector,
                                            FunctionLookupContext functionLookupContext,
                                            boolean allowComplexWriterExpr)

materializeFilterExpr

public static LogicalExpression materializeFilterExpr(LogicalExpression expr,
                                                      TupleMetadata fieldTypes,
                                                      ErrorCollector errorCollector,
                                                      FunctionLookupContext functionLookupContext)

materialize

public static LogicalExpression materialize(LogicalExpression expr,
                                            VectorAccessible batch,
                                            ErrorCollector errorCollector,
                                            FunctionLookupContext functionLookupContext,
                                            boolean allowComplexWriterExpr,
                                            boolean unionTypeEnabled)

Materializes logical expression taking into account passed parameters. Is used to materialize logical expression that contains reference to one batch.

Parameters:

expr - logical expression to be materialized

batch - batch instance

errorCollector - error collector

functionLookupContext - context to find drill function holder

allowComplexWriterExpr - true if complex expressions are allowed

unionTypeEnabled - true if union type is enabled

Returns:

materialized logical expression

materialize

public static LogicalExpression materialize(LogicalExpression expr,
                                            Map<VectorAccessible,BatchReference> batches,
                                            ErrorCollector errorCollector,
                                            FunctionLookupContext functionLookupContext,
                                            boolean allowComplexWriterExpr,
                                            boolean unionTypeEnabled)

Materializes logical expression taking into account passed parameters. Is used to materialize logical expression that can contain several batches with or without custom batch reference.

Parameters:

expr - logical expression to be materialized

batches - one or more batch instances used in expression

errorCollector - error collector

functionLookupContext - context to find drill function holder

allowComplexWriterExpr - true if complex expressions are allowed

unionTypeEnabled - true if union type is enabled

Returns:

materialized logical expression

convertToNullableType

public static LogicalExpression convertToNullableType(LogicalExpression fromExpr,
                                                      TypeProtos.MinorType toType,
                                                      FunctionLookupContext functionLookupContext,
                                                      ErrorCollector errorCollector)

addCastExpression

public static LogicalExpression addCastExpression(LogicalExpression fromExpr,
                                                  TypeProtos.MajorType toType,
                                                  FunctionLookupContext functionLookupContext,
                                                  ErrorCollector errorCollector)

addCastExpression

public static LogicalExpression addCastExpression(LogicalExpression fromExpr,
                                                  TypeProtos.MajorType toType,
                                                  FunctionLookupContext functionLookupContext,
                                                  ErrorCollector errorCollector,
                                                  boolean exactResolver)