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

Class MergeStatement

java.lang.Object

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

public class MergeStatement
extends Object

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	MergeStatement.DeleteClause
static interface	MergeStatement.DestClausePrefixSetter
static class	MergeStatement.InsertClause
static interface	MergeStatement.MergeSqlGenerator
static class	MergeStatement.MergeStatementBuilder
static class	MergeStatement.UpdateClause
protected static class	MergeStatement.WhenClause

Field Summary

Fields

Modifier and Type	Field and Description
protected static org.slf4j.Logger	LOG

Method Summary

Modifier and Type	Method and Description
String	getHintStr()
String	getOnClauseAsText()
String	getOnClausePredicate()
String	getSourceAlias()
String	getSourceName()
String	getTargetAlias()
String	getTargetName()
Table	getTargetTable()
List<MergeStatement.WhenClause>	getWhenClauses()
boolean	hasWhenNotMatchedInsertClause()
boolean	shouldValidateCardinalityViolation(HiveConf conf) Per SQL Spec ISO/IEC 9075-2:2011(E) Section 14.2 under "General Rules" Item 6/Subitem a/Subitem 2/Subitem B, an error should be raised if > 1 row of "source" matches the same row in "target".
static MergeStatement.MergeStatementBuilder	withTarget(Table targetTable, String targetName, String targetAlias)

Methods inherited from class java.lang.Object

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

Field Detail

LOG

protected static final org.slf4j.Logger LOG

Method Detail

withTarget

public static MergeStatement.MergeStatementBuilder withTarget(Table targetTable,
                                                              String targetName,
                                                              String targetAlias)

getTargetTable

public Table getTargetTable()

getTargetName

public String getTargetName()

getTargetAlias

public String getTargetAlias()

getSourceName

public String getSourceName()

getSourceAlias

public String getSourceAlias()

getOnClausePredicate

public String getOnClausePredicate()

getOnClauseAsText

public String getOnClauseAsText()

getHintStr

public String getHintStr()

getWhenClauses

public List<MergeStatement.WhenClause> getWhenClauses()

hasWhenNotMatchedInsertClause

public boolean hasWhenNotMatchedInsertClause()

shouldValidateCardinalityViolation

public boolean shouldValidateCardinalityViolation(HiveConf conf)

Per SQL Spec ISO/IEC 9075-2:2011(E) Section 14.2 under "General Rules" Item 6/Subitem a/Subitem 2/Subitem B, an error should be raised if > 1 row of "source" matches the same row in "target". This should not affect the runtime of the query as it's running in parallel with other branches of the multi-insert. It won't actually write any data to merge_tmp_table since the cardinality_violation() UDF throws an error whenever it's called killing the query

Returns:

true if another Insert clause was added