org.apache.lens.cube.parse
Class HQLParser

java.lang.Object
  org.apache.lens.cube.parse.HQLParser

public final class HQLParser
extends Object

Nested Class Summary

static interface	HQLParser.ASTNodeVisitor
static class	HQLParser.TreeNode

Field Summary

static Set<Integer>	ARITHMETIC_OPERATORS
static Set<Integer>	BINARY_OPERATORS
static Pattern	P_WSPACE
static Set<Integer>	UNARY_OPERATORS

Method Summary

static void	bft(org.apache.hadoop.hive.ql.parse.ASTNode root, HQLParser.ASTNodeVisitor visitor) Breadth first traversal of AST
static org.apache.hadoop.hive.ql.parse.ASTNode	copyAST(org.apache.hadoop.hive.ql.parse.ASTNode original)
static boolean	equalsAST(org.apache.hadoop.hive.ql.parse.ASTNode n1, org.apache.hadoop.hive.ql.parse.ASTNode n2)
static org.apache.hadoop.hive.ql.parse.ASTNode	findNodeByPath(org.apache.hadoop.hive.ql.parse.ASTNode root, int... path) Find a node in the tree rooted at root, given the path of type of tokens from the root's children to the desired node
static String	getColName(org.apache.hadoop.hive.ql.parse.ASTNode node)
static Map<Integer,String>	getHiveTokenMapping()
static String	getString(org.apache.hadoop.hive.ql.parse.ASTNode tree)
static boolean	hasAggregate(org.apache.hadoop.hive.ql.parse.ASTNode node)
static boolean	isAggregateAST(org.apache.hadoop.hive.ql.parse.ASTNode node)
static boolean	isArithmeticOp(int tokenType)
static boolean	isSelectASTNode(org.apache.hadoop.hive.ql.parse.ASTNode node)
static void	main(String[] args)
static org.apache.hadoop.hive.ql.parse.ASTNode	parseExpr(String expr)
static org.apache.hadoop.hive.ql.parse.ASTNode	parseHQL(String query)
static void	printAST(org.apache.hadoop.hive.ql.parse.ASTNode node)
static void	printAST(Map<Integer,String> tokenMapping, org.apache.hadoop.hive.ql.parse.ASTNode node, int level, int child) Debug function for printing query AST to stdout
static void	toInfixString(org.apache.hadoop.hive.ql.parse.ASTNode root, StringBuilder buf) Recursively reconstruct query string given a query AST

Methods inherited from class java.lang.Object

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

Field Detail

P_WSPACE

public static final Pattern P_WSPACE

BINARY_OPERATORS

public static final Set<Integer> BINARY_OPERATORS

ARITHMETIC_OPERATORS

public static final Set<Integer> ARITHMETIC_OPERATORS

UNARY_OPERATORS

public static final Set<Integer> UNARY_OPERATORS

Method Detail

isArithmeticOp

public static boolean isArithmeticOp(int tokenType)

parseHQL

public static org.apache.hadoop.hive.ql.parse.ASTNode parseHQL(String query)
                                                        throws org.apache.hadoop.hive.ql.parse.ParseException

Throws:

org.apache.hadoop.hive.ql.parse.ParseException

parseExpr

public static org.apache.hadoop.hive.ql.parse.ASTNode parseExpr(String expr)
                                                         throws org.apache.hadoop.hive.ql.parse.ParseException

Throws:

org.apache.hadoop.hive.ql.parse.ParseException

printAST

public static void printAST(org.apache.hadoop.hive.ql.parse.ASTNode node)

printAST

public static void printAST(Map<Integer,String> tokenMapping,
                            org.apache.hadoop.hive.ql.parse.ASTNode node,
                            int level,
                            int child)

Debug function for printing query AST to stdout

Parameters:

node -

level -

getHiveTokenMapping

public static Map<Integer,String> getHiveTokenMapping()
                                               throws Exception

Throws:

Exception

findNodeByPath

public static org.apache.hadoop.hive.ql.parse.ASTNode findNodeByPath(org.apache.hadoop.hive.ql.parse.ASTNode root,
                                                                     int... path)

Find a node in the tree rooted at root, given the path of type of tokens from the root's children to the desired node

Parameters:

root -

path - starts at the level of root's children

Returns:

copyAST

public static org.apache.hadoop.hive.ql.parse.ASTNode copyAST(org.apache.hadoop.hive.ql.parse.ASTNode original)

bft

public static void bft(org.apache.hadoop.hive.ql.parse.ASTNode root,
                       HQLParser.ASTNodeVisitor visitor)
                throws org.apache.hadoop.hive.ql.parse.SemanticException

Breadth first traversal of AST

Parameters:

root -

visitor -

Throws:

org.apache.hadoop.hive.ql.parse.SemanticException

toInfixString

public static void toInfixString(org.apache.hadoop.hive.ql.parse.ASTNode root,
                                 StringBuilder buf)

Recursively reconstruct query string given a query AST

Parameters:

root -

buf - preallocated builder where the reconstructed string will be written

main

public static void main(String[] args)
                 throws Exception

Throws:

Exception

getString

public static String getString(org.apache.hadoop.hive.ql.parse.ASTNode tree)

getColName

public static String getColName(org.apache.hadoop.hive.ql.parse.ASTNode node)

isAggregateAST

public static boolean isAggregateAST(org.apache.hadoop.hive.ql.parse.ASTNode node)

isSelectASTNode

public static boolean isSelectASTNode(org.apache.hadoop.hive.ql.parse.ASTNode node)

Parameters:

node - an ASTNode

Returns:

true when input node is a SELECT AST Node. Otherwise, false.

hasAggregate

public static boolean hasAggregate(org.apache.hadoop.hive.ql.parse.ASTNode node)

equalsAST

public static boolean equalsAST(org.apache.hadoop.hive.ql.parse.ASTNode n1,
                                org.apache.hadoop.hive.ql.parse.ASTNode n2)