Package org.h2.command.query

Class SelectListColumnResolver

java.lang.Object
org.h2.command.query.SelectListColumnResolver
All Implemented Interfaces:
ColumnResolver
public class SelectListColumnResolver extends Object implements ColumnResolver
This class represents a column resolver for the column list of a SELECT statement. It is used to resolve select column aliases in the HAVING clause. Example:

SELECT X/3 AS A, COUNT(*) FROM SYSTEM_RANGE(1, 10) GROUP BY A HAVING A > 2;

  • Method Details

    • getColumns

      public Column[] getColumns()
      Description copied from interface: ColumnResolver
      Get the column list.
      Specified by:
      getColumns in interface ColumnResolver
      Returns:
      the column list

    • findColumn

      public Column findColumn(String name)
      Description copied from interface: ColumnResolver
      Get the column with the specified name.
      Specified by:
      findColumn in interface ColumnResolver
      Parameters:
      name - the column name, must be a derived name if this column resolver has a derived column list
      Returns:
      the column with the specified name, or null

    • getSelect

      public Select getSelect()
      Description copied from interface: ColumnResolver
      Get the select statement.
      Specified by:
      getSelect in interface ColumnResolver
      Returns:
      the select statement

    • getValue

      public Value getValue(Column column)
      Description copied from interface: ColumnResolver
      Get the value for the given column.
      Specified by:
      getValue in interface ColumnResolver
      Parameters:
      column - the column
      Returns:
      the value

    • optimize

      public Expression optimize(ExpressionColumn expressionColumn, Column column)
      Description copied from interface: ColumnResolver
      Get the expression that represents this column.
      Specified by:
      optimize in interface ColumnResolver
      Parameters:
      expressionColumn - the expression column
      column - the column
      Returns:
      the optimized expression