org.apache.calcite.sql.type

Class SqlTypeTransforms

java.lang.Object

org.apache.calcite.sql.type.SqlTypeTransforms

public abstract class SqlTypeTransforms
extends Object

SqlTypeTransforms defines a number of reusable instances of SqlTypeTransform.

NOTE: avoid anonymous inner classes here except for unique, non-generalizable strategies; anything else belongs in a reusable top-level class. If you find yourself copying and pasting an existing strategy's anonymous inner class, you're making a mistake.

Field Summary

Fields

Modifier and Type	Field and Description
static SqlTypeTransform	FORCE_NULLABLE Parameter type-inference transform strategy where a derived type is transformed into the same type with nulls allowed.
static SqlTypeTransform	ONLY_COLUMN Parameter type-inference transform strategy where a derived type must be a struct type with precisely one field and the returned type is the type of that field.
static SqlTypeTransform	TO_MULTISET_ELEMENT_TYPE Parameter type-inference transform strategy where a derived type must be a multiset type and the returned type is the multiset's element type.
static SqlTypeTransform	TO_NOT_NULLABLE Parameter type-inference transform strategy where a derived type is transformed into the same type but not nullable.
static SqlTypeTransform	TO_NULLABLE Parameter type-inference transform strategy where a derived type is transformed into the same type but nullable if any of a calls operands is nullable
static SqlTypeTransform	TO_VARYING Type-inference strategy whereby the result type of a call is VARYING the type given.

Constructor Summary

Constructors

Constructor and Description
SqlTypeTransforms()

Method Summary

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

TO_NULLABLE

public static final SqlTypeTransform TO_NULLABLE

Parameter type-inference transform strategy where a derived type is transformed into the same type but nullable if any of a calls operands is nullable

TO_NOT_NULLABLE

public static final SqlTypeTransform TO_NOT_NULLABLE

Parameter type-inference transform strategy where a derived type is transformed into the same type but not nullable.

FORCE_NULLABLE

public static final SqlTypeTransform FORCE_NULLABLE

Parameter type-inference transform strategy where a derived type is transformed into the same type with nulls allowed.

TO_VARYING

public static final SqlTypeTransform TO_VARYING

Type-inference strategy whereby the result type of a call is VARYING the type given. The length returned is the same as length of the first argument. Return type will have same nullability as input type nullability. First Arg must be of string type.

TO_MULTISET_ELEMENT_TYPE

public static final SqlTypeTransform TO_MULTISET_ELEMENT_TYPE

Parameter type-inference transform strategy where a derived type must be a multiset type and the returned type is the multiset's element type.

See Also:

MultisetSqlType.getComponentType()

ONLY_COLUMN

public static final SqlTypeTransform ONLY_COLUMN

Parameter type-inference transform strategy where a derived type must be a struct type with precisely one field and the returned type is the type of that field.

Constructor Detail

SqlTypeTransforms

public SqlTypeTransforms()