Package org.apache.calcite.sql.type

Class SqlTypeTransforms

  • public abstract class SqlTypeTransforms
extends java.lang.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 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 LEAST_NULLABLE
      Type-inference strategy whereby the result is NOT NULL if any of the arguments is NOT NULL; otherwise the type is unchanged.
      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
      Parameter type-inference transform strategy that wraps a given type in a multiset.
      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_NULLABLE_ALL
      Parameter type-inference transform strategy where a derived type is transformed into the same type, but nullable if and only if all of a call's operands are nullable.
      static SqlTypeTransform TO_VARYING
      Type-inference strategy whereby the result type of a call is VARYING the type given.

    • 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_NULLABLE_ALL

        public static final SqlTypeTransform TO_NULLABLE_ALL
        Parameter type-inference transform strategy where a derived type is transformed into the same type, but nullable if and only if all of a call's operands are 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.

      • LEAST_NULLABLE

        public static final SqlTypeTransform LEAST_NULLABLE
        Type-inference strategy whereby the result is NOT NULL if any of the arguments is NOT NULL; otherwise the type is unchanged.

      • 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()