Package org.h2.expression.condition

Class ConditionInQuery

  • All Implemented Interfaces:
    HasSQL, Typed
    public final class ConditionInQuery
extends PredicateWithSubquery
    An IN() condition with a subquery, as in WHERE ID IN(SELECT ...)

    • Field Detail

      • not

        private final boolean not

      • whenOperand

        private final boolean whenOperand

      • all

        private final boolean all

      • compareType

        private final int compareType

    • Constructor Detail

      • ConditionInQuery

        public ConditionInQuery​(Expression left,
                        boolean not,
                        boolean whenOperand,
                        Query query,
                        boolean all,
                        int compareType)

    • 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

      • 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

      • 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 class PredicateWithSubquery
        Parameters:
        resolver - the column resolver
        level - the subquery nesting level
        state - current state for nesting checks, initial value is Expression.MAP_INITIAL

      • 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 class PredicateWithSubquery
        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.
        Overrides:
        getUnenclosedSQL in class PredicateWithSubquery
        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.
        Overrides:
        updateAggregate in class PredicateWithSubquery
        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.
        Overrides:
        isEverything in class PredicateWithSubquery
        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.
        Overrides:
        getCost in class PredicateWithSubquery
        Returns:
        the estimated cost

      • 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