org.apache.calcite.sql.type

Interface SqlTypeMappingRule

All Known Implementing Classes:

SqlTypeAssignmentRule, SqlTypeCoercionRule

public interface SqlTypeMappingRule

Interface that defines rules within type mappings.

Each instance should define a type mapping matrix which actually defines the rules that indicate whether one type can apply the rule to another.

Typically, the "rule" can be type assignment or type coercion.

Method Summary

Modifier and Type	Method and Description
default boolean	canApplyFrom(SqlTypeName to, SqlTypeName from) Returns whether it is valid to apply the defined rules from type from to type to.
Map<SqlTypeName,com.google.common.collect.ImmutableSet<SqlTypeName>>	getTypeMapping() Returns the type mappings of this rule instance.

Method Detail

getTypeMapping

Map<SqlTypeName,com.google.common.collect.ImmutableSet<SqlTypeName>> getTypeMapping()

Returns the type mappings of this rule instance.

The mappings should be immutable.

canApplyFrom

default boolean canApplyFrom(SqlTypeName to,
                             SqlTypeName from)

Returns whether it is valid to apply the defined rules from type from to type to.