org.apache.calcite.sql2rel

Interface DefaultValueFactory

public interface DefaultValueFactory

DefaultValueFactory supplies default values for INSERT, UPDATE, and NEW.

TODO jvs 26-Feb-2005: rename this to InitializerExpressionFactory, since it is in the process of being generalized to handle constructor invocations and eventually generated columns.

Method Summary

Methods

Modifier and Type	Method and Description
boolean	isGeneratedAlways(RelOptTable table, int iColumn) Whether a column is always generated.
RexNode	newAttributeInitializer(RelDataType type, SqlFunction constructor, int iAttribute, List<RexNode> constructorArgs) Creates an expression which evaluates to the initializer expression for a particular attribute of a structured type.
RexNode	newColumnDefaultValue(RelOptTable table, int iColumn) Creates an expression which evaluates to the default value for a particular column.

Method Detail

isGeneratedAlways

boolean isGeneratedAlways(RelOptTable table,
                        int iColumn)

Whether a column is always generated. If a column is always generated, then non-generated values cannot be inserted into the column.

newColumnDefaultValue

RexNode newColumnDefaultValue(RelOptTable table,
                            int iColumn)

Creates an expression which evaluates to the default value for a particular column.

Parameters:

table - the table containing the column

iColumn - the 0-based offset of the column in the table

Returns:

default value expression

newAttributeInitializer

RexNode newAttributeInitializer(RelDataType type,
                              SqlFunction constructor,
                              int iAttribute,
                              List<RexNode> constructorArgs)

Creates an expression which evaluates to the initializer expression for a particular attribute of a structured type.

Parameters:

type - the structured type

constructor - the constructor invoked to initialize the type

iAttribute - the 0-based offset of the attribute in the type

constructorArgs - arguments passed to the constructor invocation

Returns:

default value expression