Interface ModifiableView

  • All Superinterfaces:
    All Known Implementing Classes:

    public interface ModifiableView
    extends Table
    A modifiable view onto ModifiableTable.

    It describes how its columns map onto the underlying table's columns, and any constraints that incoming rows must satisfy.

    For example, given

       CREATE TABLE emps (empno INTEGER, gender VARCHAR(1), deptno INTEGER);
       CREATE VIEW female_emps AS
         SELECT empno, deptno FROM emps WHERE gender = 'F';

    constraint is $1 = 'F' and column mapping is [0, 2].

    NOTE: The current API is inefficient and experimental. It will change without notice.

    • Method Detail

      • getConstraint

        RexNode getConstraint​(RexBuilder rexBuilder,
                              RelDataType tableRowType)
        Returns a constraint that each candidate row must satisfy.

        Never null; if there is no constraint, returns "true".

        rexBuilder - Rex builder
        tableRowType - Row type of the table that this view maps onto
      • getColumnMapping

        ImmutableIntList getColumnMapping()
        Returns the column mapping onto another table.

        mapping[i] contains the column of the underlying table that the ith column of the view comes from, or -1 if it is based on an expression.

      • getTable

        Table getTable()
        Returns the underlying table.
      • getTablePath

        Path getTablePath()
        Returns the full path of the underlying table.