org.apache.hadoop.hive.ql.parse.rewrite.sql

Class SetClausePatcher

java.lang.Object

org.apache.hadoop.hive.ql.parse.rewrite.sql.SetClausePatcher

public class SetClausePatcher
extends Object

Constructor Summary

Constructors

Constructor and Description
SetClausePatcher()

Method Summary

Modifier and Type	Method and Description
void	patchProjectionForUpdate(ASTNode insertBranch, Map<Integer,ASTNode> setColExprs) Patch up the projection list for updates, putting back the original set expressions.

Methods inherited from class java.lang.Object

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

Constructor Detail

SetClausePatcher

public SetClausePatcher()

Method Detail

patchProjectionForUpdate

public void patchProjectionForUpdate(ASTNode insertBranch,
                                     Map<Integer,ASTNode> setColExprs)

Patch up the projection list for updates, putting back the original set expressions. Walk through the projection list and replace the column names with the expressions from the original update. Under the TOK_SELECT (see above) the structure looks like:

 TOK_SELECT -> TOK_SELEXPR -> expr
           \-> TOK_SELEXPR -> expr ...