Class Wildcard

  • All Implemented Interfaces:
    HasSQL, Typed

    public final class Wildcard
    extends Expression
    A wildcard expression as in SELECT * FROM TEST. This object is only used temporarily during the parsing phase, and later replaced by column expressions.
    • Field Detail

      • schema

        private final java.lang.String schema
      • table

        private final java.lang.String table
    • Constructor Detail

      • Wildcard

        public Wildcard​(java.lang.String schema,
                        java.lang.String table)
    • Method Detail

      • getExceptColumns

        public java.util.ArrayList<ExpressionColumn> getExceptColumns()
      • setExceptColumns

        public void setExceptColumns​(java.util.ArrayList<ExpressionColumn> exceptColumns)
      • mapExceptColumns

        public java.util.HashMap<Column,​ExpressionColumn> mapExceptColumns()
        Returns map of excluded table columns to expression columns and validates that all columns are resolved and not duplicated.
        Returns:
        map of excluded table columns to expression columns
      • 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
      • 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
      • 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
      • 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
      • getTableAlias

        public java.lang.String getTableAlias()
        Description copied from class: Expression
        Get the table alias name or null if this expression does not represent a column.
        Overrides:
        getTableAlias in class Expression
        Returns:
        the table alias name
      • getSchemaName

        public java.lang.String getSchemaName()
        Description copied from class: Expression
        Get the schema name, or null
        Overrides:
        getSchemaName in class Expression
        Returns:
        the schema name
      • 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
      • 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