Package org.h2.expression.condition
Class ConditionInQuery
- java.lang.Object
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- org.h2.expression.Expression
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- org.h2.expression.condition.Condition
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- org.h2.expression.condition.PredicateWithSubquery
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- org.h2.expression.condition.ConditionInQuery
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public final class ConditionInQuery extends PredicateWithSubquery
An IN() condition with a subquery, as in WHERE ID IN(SELECT ...)
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Field Summary
Fields Modifier and Type Field Description private boolean
all
private int
compareType
private Expression
left
private boolean
not
private boolean
whenOperand
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Fields inherited from class org.h2.expression.condition.PredicateWithSubquery
query
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Fields inherited from class org.h2.expression.Expression
AUTO_PARENTHESES, MAP_IN_AGGREGATE, MAP_IN_WINDOW, MAP_INITIAL, WITH_PARENTHESES, WITHOUT_PARENTHESES
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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
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Constructor Summary
Constructors Constructor Description ConditionInQuery(Expression left, boolean not, boolean whenOperand, Query query, boolean all, int compareType)
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method 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.private Value
getNullSafeValueSlow(SessionLocal session, ResultInterface rows, Value l)
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.private Value
getValue(SessionLocal session, Value left)
private Value
getValueSlow(SessionLocal session, ResultInterface rows, Value l)
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.condition.Condition
castToBoolean, getType
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Methods inherited from class org.h2.expression.Expression
addFilterConditions, getAlias, getBooleanValue, getColumnName, getColumnNameForView, getEnclosedSQL, getNonAliasExpression, getNullable, getSchemaName, getSQL, getSQL, getSQL, getSQL, getSubexpression, getSubexpressionCount, getTableAlias, getTableName, isConstant, isIdentity, isNullConstant, isValueSet, optimizeCondition, toString, writeExpressions, writeExpressions
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Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait
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Methods inherited from interface org.h2.util.HasSQL
getTraceSQL
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Field Detail
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left
private Expression left
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not
private final boolean not
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whenOperand
private final boolean whenOperand
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all
private final boolean all
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compareType
private final int compareType
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Constructor Detail
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ConditionInQuery
public ConditionInQuery(Expression left, boolean not, boolean whenOperand, Query query, boolean all, int compareType)
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Method Detail
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getValue
public Value getValue(SessionLocal session)
Description copied from class:Expression
Return the resulting value for the current row.- Specified by:
getValue
in classExpression
- Parameters:
session
- the session- Returns:
- the result
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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 classExpression
- Parameters:
session
- the sessionleft
- value on the left side- Returns:
- the result
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getValue
private Value getValue(SessionLocal session, Value left)
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getValueSlow
private Value getValueSlow(SessionLocal session, ResultInterface rows, Value l)
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getNullSafeValueSlow
private Value getNullSafeValueSlow(SessionLocal session, ResultInterface rows, Value l)
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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 classExpression
- Returns:
true
if it is,false
otherwise
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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 classExpression
- Parameters:
session
- the session- Returns:
- the negated expression, or null
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mapColumns
public void mapColumns(ColumnResolver resolver, int level, int state)
Description copied from class:Expression
Map the columns of the resolver to expression columns.- Overrides:
mapColumns
in classPredicateWithSubquery
- Parameters:
resolver
- the column resolverlevel
- the subquery nesting levelstate
- current state for nesting checks, initial value isExpression.MAP_INITIAL
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optimize
public Expression optimize(SessionLocal session)
Description copied from class:Expression
Try to optimize the expression.- Overrides:
optimize
in classPredicateWithSubquery
- Parameters:
session
- the session- Returns:
- the optimized expression
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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.- Overrides:
setEvaluatable
in classPredicateWithSubquery
- Parameters:
tableFilter
- the table filterb
- true if the table filter can return value
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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 classExpression
- Returns:
true
if it is
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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 classPredicateWithSubquery
- Parameters:
builder
- string buildersqlFlags
- formatting flags- Returns:
- the specified string builder
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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 classExpression
- Parameters:
builder
- string buildersqlFlags
- formatting flags- Returns:
- the specified string builder
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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.- Overrides:
updateAggregate
in classPredicateWithSubquery
- Parameters:
session
- the sessionstage
- select stage
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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.- Overrides:
isEverything
in classPredicateWithSubquery
- Parameters:
visitor
- the visitor- Returns:
- if the criteria can be fulfilled
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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.- Overrides:
getCost
in classPredicateWithSubquery
- Returns:
- the estimated cost
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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 classExpression
- Parameters:
session
- the sessionfilter
- the table filter
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