UniquePredicate

java.lang.Object
- org.h2.expression.Expression
- - org.h2.expression.condition.Condition
  - - org.h2.expression.condition.PredicateWithSubquery
    - - org.h2.expression.condition.UniquePredicate

All Implemented Interfaces:

HasSQL, Typed
```
public class UniquePredicate
extends PredicateWithSubquery
```
Unique predicate as in UNIQUE(SELECT ...)

Nested Class Summary

Nested Classes
Modifier and Type Class Description

private static class UniquePredicate.Target

Field Summary
- Fields inherited from class org.h2.expression.condition.PredicateWithSubquery
  query
- Fields inherited from class org.h2.expression.Expression
  AUTO_PARENTHESES, MAP_IN_AGGREGATE, MAP_IN_WINDOW, MAP_INITIAL, WITH_PARENTHESES, WITHOUT_PARENTHESES
- Fields inherited from interface org.h2.util.HasSQL
  ADD_PLAN_INFORMATION, DEFAULT_SQL_FLAGS, NO_CASTS, QUOTE_ONLY_WHEN_REQUIRED, REPLACE_LOBS_FOR_TRACE, TRACE_SQL_FLAGS

Constructor Summary

Constructors
Constructor Description

UniquePredicate(Query query)

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`java.lang.StringBuilder`	`getUnenclosedSQL(java.lang.StringBuilder builder, int sqlFlags)`	Get the SQL statement of this expression.
`Value`	`getValue(SessionLocal session)`	Return the resulting value for the current row.
`Expression`	`optimize(SessionLocal session)`	Try to optimize the expression.

Methods inherited from class org.h2.expression.condition.PredicateWithSubquery
getCost, isEverything, mapColumns, setEvaluatable, updateAggregate

Methods inherited from class org.h2.expression.condition.Condition
castToBoolean, getType

Methods inherited from class org.h2.expression.Expression
addFilterConditions, createIndexConditions, getAlias, getBooleanValue, getColumnName, getColumnNameForView, getEnclosedSQL, getNonAliasExpression, getNotIfPossible, getNullable, getSchemaName, getSQL, getSQL, getSQL, getSQL, getSubexpression, getSubexpressionCount, getTableAlias, getTableName, getWhenSQL, getWhenValue, isConstant, isIdentity, isNullConstant, isValueSet, isWhenConditionOperand, needParentheses, optimizeCondition, toString, writeExpressions, writeExpressions

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Methods inherited from interface org.h2.util.HasSQL
getTraceSQL

- Constructor Detail
  - UniquePredicate
```
public UniquePredicate(Query query)
```
- Method Detail
  - optimize
```
public Expression optimize(SessionLocal session)
```
    Description copied from class: Expression
    
    Try to optimize the expression.
    
    Overrides:
    
    optimize in class PredicateWithSubquery
    
    Parameters:
    
    session - the session
    
    Returns:
    
    the optimized expression
  - getValue
```
public Value getValue(SessionLocal session)
```
    Description copied from class: Expression
    
    Return the resulting value for the current row.
    
    Specified by:
    
    getValue in class Expression
    
    Parameters:
    
    session - the session
    
    Returns:
    
    the result
  - getUnenclosedSQL
```
public java.lang.StringBuilder getUnenclosedSQL(java.lang.StringBuilder builder,
                                                int sqlFlags)
```
    Description copied from class: Expression
    
    Get the SQL statement of this expression. This may not always be the original SQL statement, especially after optimization. Enclosing '(' and ')' are never appended.
    
    Overrides:
    
    getUnenclosedSQL in class PredicateWithSubquery
    
    Parameters:
    
    builder - string builder
    
    sqlFlags - formatting flags
    
    Returns:
    
    the specified string builder