org.apache.hadoop.hive.ql.parse

Class ParseUtils

java.lang.Object

org.apache.hadoop.hive.ql.parse.ParseUtils

public final class ParseUtils
extends Object

Library of utility functions used in the parse code.

Method Summary

Methods

Modifier and Type	Method and Description
static ExprNodeDesc	createConversionCast(ExprNodeDesc column, PrimitiveTypeInfo tableFieldTypeInfo)
static String	ensureClassExists(String className)
static ASTNode	findRootNonNullToken(ASTNode tree) Performs a descent of the leftmost branch of a tree, stopping when either a node with a non-null token is found or the leaf level is encountered.
static CharTypeInfo	getCharTypeInfo(ASTNode node)
static DecimalTypeInfo	getDecimalTypeTypeInfo(ASTNode node)
static VarcharTypeInfo	getVarcharTypeInfo(ASTNode node)
static boolean	isJoinToken(ASTNode node) Tests whether the parse tree node is a join token.
static List<String>	validateColumnNameUniqueness(List<FieldSchema> fieldSchemas)

Methods inherited from class java.lang.Object

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

Method Detail

isJoinToken

public static boolean isJoinToken(ASTNode node)

Tests whether the parse tree node is a join token.

Parameters:

node - The parse tree node

Returns:

boolean

findRootNonNullToken

public static ASTNode findRootNonNullToken(ASTNode tree)

Performs a descent of the leftmost branch of a tree, stopping when either a node with a non-null token is found or the leaf level is encountered.

Parameters:

tree - candidate node from which to start searching

Returns:

node at which descent stopped

validateColumnNameUniqueness

public static List<String> validateColumnNameUniqueness(List<FieldSchema> fieldSchemas)
                                                 throws SemanticException

Throws:

SemanticException

createConversionCast

public static ExprNodeDesc createConversionCast(ExprNodeDesc 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

getVarcharTypeInfo

public static VarcharTypeInfo getVarcharTypeInfo(ASTNode node)
                                          throws SemanticException

Throws:

SemanticException

getCharTypeInfo

public static CharTypeInfo getCharTypeInfo(ASTNode node)
                                    throws SemanticException

Throws:

SemanticException

getDecimalTypeTypeInfo

public static DecimalTypeInfo getDecimalTypeTypeInfo(ASTNode node)
                                              throws SemanticException

Throws:

SemanticException

ensureClassExists

public static String ensureClassExists(String className)
                                throws SemanticException

Throws:

SemanticException