Package org.h2.expression.condition

Class ConditionLocalAndGlobal

  • All Implemented Interfaces:
    HasSQL, Typed
    public class ConditionLocalAndGlobal
extends Condition
    A global condition or combination of local and global conditions. May be used only as a top-level expression in a WHERE, HAVING, or QUALIFY clause of a SELECT.

    • Constructor Detail

    • Method Detail

      • 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

      • 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

      • 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

      • 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

      • addFilterConditions

        public void addFilterConditions​(TableFilter filter)
        Description copied from class: Expression
        Add conditions to a table filter if they can be evaluated.
        Overrides:
        addFilterConditions in class Expression
        Parameters:
        filter - the table filter

      • 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

      • 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

      • 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