ConditionInConstantSet

java.lang.Object
- org.h2.expression.Expression
- - org.h2.expression.condition.ConditionInConstantSet

All Implemented Interfaces:

HasSQL, Typed
```
public final class ConditionInConstantSet
extends Expression
```
Used for optimised IN(...) queries where the contents of the IN list are all constant and of the same type.

Field Summary
- 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

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method and Description
`void`	`createIndexConditions(SessionLocal session, TableFilter filter)` Create index conditions if possible and attach them to the table filter.
`int`	`getCost()` Estimate the cost to process the expression.
`Expression`	`getNotIfPossible(SessionLocal session)` If it is possible, return the negated expression.
`Expression`	`getSubexpression(int index)` Returns subexpression with specified index.
`int`	`getSubexpressionCount()` Returns count of subexpressions.
`TypeInfo`	`getType()` Returns the data type.
`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.
`java.lang.StringBuilder`	`getWhenSQL(java.lang.StringBuilder builder, int sqlFlags)` Appends the SQL statement of this when operand to the specified builder.
`boolean`	`getWhenValue(SessionLocal session, Value left)` Return the resulting value of when operand for the current row.
`boolean`	`isEverything(ExpressionVisitor visitor)` Check if this expression and all sub-expressions can fulfill a criteria.
`boolean`	`isWhenConditionOperand()` Returns whether this expression is a right side of condition in a when operand.
`void`	`mapColumns(ColumnResolver resolver, int level, int state)` Map the columns of the resolver to expression columns.
`boolean`	`needParentheses()` Returns whether this expressions needs to be wrapped in parentheses when it is used as an argument of other expressions.
`Expression`	`optimize(SessionLocal session)` Try to optimize the expression.
`void`	`setEvaluatable(TableFilter tableFilter, boolean b)` Tell the expression columns whether the table filter can return values now.
`void`	`updateAggregate(SessionLocal session, int stage)` Update an aggregate value.

Methods inherited from class org.h2.expression.Expression
addFilterConditions, getAlias, getBooleanValue, getColumnName, getColumnNameForView, getEnclosedSQL, getNonAliasExpression, getNullable, getSchemaName, getSQL, getSQL, getSQL, getSQL, getTableAlias, getTableName, isConstant, isIdentity, isNullConstant, isValueSet, 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

- Method Detail
  - 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
  - getWhenValue
```
public boolean getWhenValue(SessionLocal session,
                            Value left)
```
    Description copied from class: Expression
    
    Return the resulting value of when operand for the current row.
    
    Overrides:
    
    getWhenValue in class Expression
    
    Parameters:
    
    session - the session
    
    left - value on the left side
    
    Returns:
    
    the result
  - isWhenConditionOperand
```
public boolean isWhenConditionOperand()
```
    Description copied from class: Expression
    
    Returns whether this expression is a right side of condition in a when operand.
    
    Overrides:
    
    isWhenConditionOperand in class Expression
    
    Returns:
    
    true if it is, false otherwise
  - mapColumns
```
public void mapColumns(ColumnResolver resolver,
                       int level,
                       int state)
```
    Description copied from class: Expression
    
    Map the columns of the resolver to expression columns.
    
    Specified by:
    
    mapColumns in class Expression
    
    Parameters:
    
    resolver - the column resolver
    
    level - the subquery nesting level
    
    state - current state for nesting checks, initial value is Expression.MAP_INITIAL
  - optimize
```
public Expression optimize(SessionLocal session)
```
    Description copied from class: Expression
    
    Try to optimize the expression.
    
    Specified by:
    
    optimize in class Expression
    
    Parameters:
    
    session - the session
    
    Returns:
    
    the optimized expression
  - getNotIfPossible
```
public Expression getNotIfPossible(SessionLocal session)
```
    Description copied from class: Expression
    
    If it is possible, return the negated expression. This is used to optimize NOT expressions: NOT ID>10 can be converted to ID<=10. Returns null if negating is not possible.
    
    Overrides:
    
    getNotIfPossible in class Expression
    
    Parameters:
    
    session - the session
    
    Returns:
    
    the negated expression, or null
  - createIndexConditions
```
public void createIndexConditions(SessionLocal session,
                                  TableFilter filter)
```
    Description copied from class: Expression
    
    Create index conditions if possible and attach them to the table filter.
    
    Overrides:
    
    createIndexConditions in class Expression
    
    Parameters:
    
    session - the session
    
    filter - the table filter
  - setEvaluatable
```
public void setEvaluatable(TableFilter tableFilter,
                           boolean b)
```
    Description copied from class: Expression
    
    Tell the expression columns whether the table filter can return values now. This is used when optimizing the query.
    
    Specified by:
    
    setEvaluatable in class Expression
    
    Parameters:
    
    tableFilter - the table filter
    
    b - true if the table filter can return value
  - needParentheses
```
public boolean needParentheses()
```
    Description copied from class: Expression
    
    Returns whether this expressions needs to be wrapped in parentheses when it is used as an argument of other expressions.
    
    Overrides:
    
    needParentheses in class Expression
    
    Returns:
    
    true if it is
  - 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.
    
    Specified by:
    
    getUnenclosedSQL in class Expression
    
    Parameters:
    
    builder - string builder
    
    sqlFlags - formatting flags
    
    Returns:
    
    the specified string builder
  - getWhenSQL
```
public java.lang.StringBuilder getWhenSQL(java.lang.StringBuilder builder,
                                          int sqlFlags)
```
    Description copied from class: Expression
    
    Appends the SQL statement of this when operand to the specified builder.
    
    Overrides:
    
    getWhenSQL in class Expression
    
    Parameters:
    
    builder - string builder
    
    sqlFlags - formatting flags
    
    Returns:
    
    the specified string builder
  - updateAggregate
```
public void updateAggregate(SessionLocal session,
                            int stage)
```
    Description copied from class: Expression
    
    Update an aggregate value. This method is called at statement execution time. It is usually called once for each row, but if the expression is used multiple times (for example in the column list, and as part of the HAVING expression) it is called multiple times - the row counter needs to be used to make sure the internal state is only updated once.
    
    Specified by:
    
    updateAggregate in class Expression
    
    Parameters:
    
    session - the session
    
    stage - select stage
  - isEverything
```
public boolean isEverything(ExpressionVisitor visitor)
```
    Description copied from class: Expression
    
    Check if this expression and all sub-expressions can fulfill a criteria. If any part returns false, the result is false.
    
    Specified by:
    
    isEverything in class Expression
    
    Parameters:
    
    visitor - the visitor
    
    Returns:
    
    if the criteria can be fulfilled
  - getCost
```
public int getCost()
```
    Description copied from class: Expression
    
    Estimate the cost to process the expression. Used when optimizing the query, to calculate the query plan with the lowest estimated cost.
    
    Specified by:
    
    getCost in class Expression
    
    Returns:
    
    the estimated cost
  - getSubexpressionCount
```
public int getSubexpressionCount()
```
    Description copied from class: Expression
    
    Returns count of subexpressions.
    
    Overrides:
    
    getSubexpressionCount in class Expression
    
    Returns:
    
    count of subexpressions
  - getSubexpression
```
public Expression getSubexpression(int index)
```
    Description copied from class: Expression
    
    Returns subexpression with specified index.
    
    Overrides:
    
    getSubexpression in class Expression
    
    Parameters:
    
    index - 0-based index
    
    Returns:
    
    subexpression with specified index, may be null
  - getType
```
public TypeInfo getType()
```
    Description copied from class: Expression
    
    Returns the data type. The data type may be unknown before the optimization phase.
    
    Specified by:
    
    getType in interface Typed
    
    Specified by:
    
    getType in class Expression
    
    Returns:
    
    the data type

Class ConditionInConstantSet

Field Summary

Fields inherited from class org.h2.expression.Expression

Fields inherited from interface org.h2.util.HasSQL

Method Summary

Methods inherited from class org.h2.expression.Expression

Methods inherited from class java.lang.Object

Methods inherited from interface org.h2.util.HasSQL

Method Detail

getValue

getWhenValue

isWhenConditionOperand

mapColumns

optimize

getNotIfPossible

createIndexConditions

setEvaluatable

needParentheses

getUnenclosedSQL

getWhenSQL

updateAggregate

isEverything

getCost

getSubexpressionCount

getSubexpression

getType