org.apache.calcite.sql2rel

Interface InitializerExpressionFactory

All Known Implementing Classes:

ModifiableViewTable.ModifiableViewTableInitializerExpressionFactory, NullInitializerExpressionFactory

public interface InitializerExpressionFactory

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

Method Summary

Modifier and Type	Method and Description
ColumnStrategy	generationStrategy(RelOptTable table, int iColumn) Returns how a column is populated.
boolean	isGeneratedAlways(RelOptTable table, int iColumn) Deprecated. Use c.generationStrategy(t, i) == VIRTUAL || c.generationStrategy(t, i) == STORED
RexNode	newAttributeInitializer(RelDataType type, SqlFunction constructor, int iAttribute, List<RexNode> constructorArgs, InitializerContext context) Creates an expression which evaluates to the initializer expression for a particular attribute of a structured type.
RexNode	newColumnDefaultValue(RelOptTable table, int iColumn, InitializerContext context) Creates an expression which evaluates to the default value for a particular column.

Method Detail

isGeneratedAlways

@Deprecated
boolean isGeneratedAlways(RelOptTable table,
                                      int iColumn)

Deprecated. Use c.generationStrategy(t, i) == VIRTUAL || c.generationStrategy(t, i) == STORED

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

See Also:

generationStrategy(RelOptTable, int)

generationStrategy

ColumnStrategy generationStrategy(RelOptTable table,
                                  int iColumn)

Returns how a column is populated.

Parameters:

table - the table containing the column

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

Returns:

generation strategy, never null

See Also:

RelOptTable.getColumnStrategies()

newColumnDefaultValue

RexNode newColumnDefaultValue(RelOptTable table,
                              int iColumn,
                              InitializerContext context)

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

context - Context for creating the expression

Returns:

default value expression

newAttributeInitializer

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

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

context - Context for creating the expression

Returns:

default value expression