org.apache.hadoop.hive.ql.parse.type

Class TypeCheckProcFactory.DefaultExprProcessor

java.lang.Object

org.apache.hadoop.hive.ql.parse.type.TypeCheckProcFactory.DefaultExprProcessor

All Implemented Interfaces:

NodeProcessor, SemanticNodeProcessor

Direct Known Subclasses:

JoinCondTypeCheckProcFactory.JoinCondDefaultExprProcessor

Enclosing class:

TypeCheckProcFactory<T>

public class TypeCheckProcFactory.DefaultExprProcessor
extends Object
implements SemanticNodeProcessor

The default processor for typechecking.

Constructor Summary

Constructors

Constructor and Description
DefaultExprProcessor()

Method Summary

Modifier and Type	Method and Description
T	createConversionCast(T column, PrimitiveTypeInfo tableFieldTypeInfo)
T	getFuncExprNodeDesc(String udfName, T... children)
T	getFuncExprNodeDescWithUdfData(String udfName, TypeInfo typeInfo, T... children) This function create an ExprNodeDesc for a UDF function given the children (arguments).
protected List<String>	getReferenceableColumnAliases(TypeCheckCtx ctx)
protected T	getXpathOrFuncExprNodeDesc(ASTNode node, boolean isFunction, List<T> children, TypeCheckCtx ctx)
protected T	interpretNodeAsConstant(PrimitiveTypeInfo targetType, T constChild)
Object	process(Node nd, Stack<Node> stack, NodeProcessorCtx procCtx, Object... nodeOutputs) Generic process for all ops that don't have specific implementations.
protected T	processQualifiedColRef(TypeCheckCtx ctx, ASTNode expr, Object... nodeOutputs)
protected void	validateUDF(ASTNode expr, boolean isFunction, TypeCheckCtx ctx, FunctionInfo fi, List<T> children)

Methods inherited from class java.lang.Object

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

Constructor Detail

DefaultExprProcessor

public DefaultExprProcessor()

Method Detail

getFuncExprNodeDescWithUdfData

public T getFuncExprNodeDescWithUdfData(String udfName,
                                        TypeInfo typeInfo,
                                        T... children)
                                 throws SemanticException

This function create an ExprNodeDesc for a UDF function given the children (arguments). It will insert implicit type conversion functions if necessary.

Throws:

UDFArgumentException

SemanticException

getFuncExprNodeDesc

public T getFuncExprNodeDesc(String udfName,
                             T... children)
                      throws SemanticException

Throws:

SemanticException

createConversionCast

public T createConversionCast(T column,
                              PrimitiveTypeInfo tableFieldTypeInfo)
                       throws SemanticException

Parameters:

column - column expression to convert

tableFieldTypeInfo - TypeInfo to convert to

Returns:

Expression converting column to the type specified by tableFieldTypeInfo

Throws:

SemanticException

validateUDF

protected void validateUDF(ASTNode expr,
                           boolean isFunction,
                           TypeCheckCtx ctx,
                           FunctionInfo fi,
                           List<T> children)
                    throws SemanticException

Throws:

SemanticException

getXpathOrFuncExprNodeDesc

protected T getXpathOrFuncExprNodeDesc(ASTNode node,
                                       boolean isFunction,
                                       List<T> children,
                                       TypeCheckCtx ctx)
                                throws SemanticException

Throws:

SemanticException

interpretNodeAsConstant

protected T interpretNodeAsConstant(PrimitiveTypeInfo targetType,
                                    T constChild)
                             throws SemanticException

Throws:

SemanticException

processQualifiedColRef

protected T processQualifiedColRef(TypeCheckCtx ctx,
                                   ASTNode expr,
                                   Object... nodeOutputs)
                            throws SemanticException

Throws:

SemanticException

process

public Object process(Node nd,
                      Stack<Node> stack,
                      NodeProcessorCtx procCtx,
                      Object... nodeOutputs)
               throws SemanticException

Description copied from interface: SemanticNodeProcessor

Generic process for all ops that don't have specific implementations.

Specified by:

process in interface NodeProcessor

Specified by:

process in interface SemanticNodeProcessor

Parameters:

nd - operator to process

procCtx - operator processor context

nodeOutputs - A variable argument list of outputs from other nodes in the walk

Returns:

Object to be returned by the process call

Throws:

SemanticException

getReferenceableColumnAliases

protected List<String> getReferenceableColumnAliases(TypeCheckCtx ctx)