org.apache.flink.table.planner.delegation.hive.copy

Class HiveParserUnparseTranslator

java.lang.Object

org.apache.flink.table.planner.delegation.hive.copy.HiveParserUnparseTranslator

public class HiveParserUnparseTranslator
extends Object

Counterpart of hive's org.apache.hadoop.hive.ql.parse.UnparseTranslator.

Constructor Summary

Constructors

Constructor and Description
HiveParserUnparseTranslator(org.apache.hadoop.conf.Configuration conf)

Method Summary

Modifier and Type	Method and Description
void	addCopyTranslation(HiveParserASTNode targetNode, HiveParserASTNode sourceNode) Register a "copy" translation in which a node will be translated into whatever the translation turns out to be for another node (after previously registered translations have already been performed).
void	addIdentifierTranslation(HiveParserASTNode identifier) Register a translation for an identifier.
void	addTableNameTranslation(HiveParserASTNode tableName, String currentCatalog, String currentDatabaseName)
void	addTranslation(HiveParserASTNode node, String replacementText) Register a translation to be performed as part of unparse.
void	applyTranslations(org.antlr.runtime.TokenRewriteStream tokenRewriteStream) Apply all translations on the given token stream.
void	clear()
void	enable()
boolean	isEnabled()

Methods inherited from class java.lang.Object

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

Constructor Detail

HiveParserUnparseTranslator

public HiveParserUnparseTranslator(org.apache.hadoop.conf.Configuration conf)

Method Detail

enable

public void enable()

isEnabled

public boolean isEnabled()

addTranslation

public void addTranslation(HiveParserASTNode node,
                           String replacementText)

Register a translation to be performed as part of unparse. ANTLR imposes strict conditions on the translations and errors out during TokenRewriteStream.toString() if there is an overlap. It expects all the translations to be disjoint (See HIVE-2439). If the translation overlaps with any previously registered translation, then it must be either identical or a prefix (in which cases it is ignored), or else it must extend the existing translation (i.e. the existing translation must be a prefix/suffix of the new translation). All other overlap cases result in assertion failures.

Parameters:

node - target node whose subtree is to be replaced

replacementText - text to use as replacement

addTableNameTranslation

public void addTableNameTranslation(HiveParserASTNode tableName,
                                    String currentCatalog,
                                    String currentDatabaseName)

addIdentifierTranslation

public void addIdentifierTranslation(HiveParserASTNode identifier)

Register a translation for an identifier.

addCopyTranslation

public void addCopyTranslation(HiveParserASTNode targetNode,
                               HiveParserASTNode sourceNode)

Register a "copy" translation in which a node will be translated into whatever the translation turns out to be for another node (after previously registered translations have already been performed). Deferred translations are performed in the order they are registered, and follow the same rules regarding overlap as non-copy translations.

Parameters:

targetNode - node whose subtree is to be replaced

sourceNode - the node providing the replacement text

applyTranslations

public void applyTranslations(org.antlr.runtime.TokenRewriteStream tokenRewriteStream)

Apply all translations on the given token stream.

Parameters:

tokenRewriteStream - rewrite-capable stream

clear

public void clear()