org.apache.hadoop.hive.ql.parse

Class AbstractSemanticAnalyzerHook

java.lang.Object

org.apache.hadoop.hive.ql.parse.AbstractSemanticAnalyzerHook

All Implemented Interfaces:

Hook, HiveSemanticAnalyzerHook

Direct Known Subclasses:

HCatSemanticAnalyzerBase

public abstract class AbstractSemanticAnalyzerHook
extends Object
implements HiveSemanticAnalyzerHook

Constructor Summary

Constructors

Constructor and Description
AbstractSemanticAnalyzerHook()

Method Summary

Methods

Modifier and Type	Method and Description
void	postAnalyze(HiveSemanticAnalyzerHookContext context, List<Task<? extends Serializable>> rootTasks) Invoked after Hive performs its own semantic analysis on a statement (including optimization).
ASTNode	preAnalyze(HiveSemanticAnalyzerHookContext context, ASTNode ast) Invoked before Hive performs its own semantic analysis on a statement.

Methods inherited from class java.lang.Object

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

Constructor Detail

AbstractSemanticAnalyzerHook

public AbstractSemanticAnalyzerHook()

Method Detail

preAnalyze

public ASTNode preAnalyze(HiveSemanticAnalyzerHookContext context,
                 ASTNode ast)
                   throws SemanticException

Description copied from interface: HiveSemanticAnalyzerHook

Invoked before Hive performs its own semantic analysis on a statement. The implementation may inspect the statement AST and prevent its execution by throwing a SemanticException. Optionally, it may also augment/rewrite the AST, but must produce a form equivalent to one which could have been returned directly from Hive's own parser.

Specified by:

preAnalyze in interface HiveSemanticAnalyzerHook

Parameters:

context - context information for semantic analysis

ast - AST being analyzed and optionally rewritten

Returns:

replacement AST (typically the same as the original AST unless the entire tree had to be replaced; must not be null)

Throws:

SemanticException

postAnalyze

public void postAnalyze(HiveSemanticAnalyzerHookContext context,
               List<Task<? extends Serializable>> rootTasks)
                 throws SemanticException

Description copied from interface: HiveSemanticAnalyzerHook

Invoked after Hive performs its own semantic analysis on a statement (including optimization). Hive calls postAnalyze on the same hook object as preAnalyze, so the hook can maintain state across the calls.

Specified by:

postAnalyze in interface HiveSemanticAnalyzerHook

Parameters:

context - context information for semantic analysis

rootTasks - root tasks produced by semantic analysis; the hook is free to modify this list or its contents

Throws:

SemanticException