Package org.apache.flink.table.runtime.typeutils

Class ExternalTypeInfo<T>

  • Type Parameters:
    T - external data structure
    All Implemented Interfaces:
    Serializable, org.apache.flink.table.types.DataTypeQueryable
    @Internal
public final class ExternalTypeInfo<T>
extends org.apache.flink.api.common.typeinfo.TypeInformation<T>
implements org.apache.flink.table.types.DataTypeQueryable
    Type information that wraps a serializer that originated from a DataType.

    TypeInformation is a legacy class for the sole purpose of creating a TypeSerializer. This class acts as an adapter when entering or leaving the table ecosystem to other APIs where type information is required.

    The original DataType is stored in every instance (for access during pre-flight phase and planning) but has no effect on equality because only serialization matters during runtime.

    Note: This class is incomplete yet and only supports RAW types. But will be updated to support all kinds of data types in the future.

    See Also:
    Serialized Form

    • Method Detail

      • of

        public static <T> ExternalTypeInfo<T> of​(org.apache.flink.table.types.DataType dataType)
        Creates type information for a DataType that is possibly represented by internal data structures but serialized and deserialized into external data structures.

      • of

        public static <T> ExternalTypeInfo<T> of​(org.apache.flink.table.types.DataType dataType,
                                         boolean isInternalInput)
        Creates type information for a DataType that is possibly represented by internal data structures but serialized and deserialized into external data structures.
        Parameters:
        isInternalInput - allows for a non-bidirectional serializer from internal to external

      • getDataType

        public org.apache.flink.table.types.DataType getDataType()
        Specified by:
        getDataType in interface org.apache.flink.table.types.DataTypeQueryable

      • isBasicType

        public boolean isBasicType()
        Specified by:
        isBasicType in class org.apache.flink.api.common.typeinfo.TypeInformation<T>

      • isTupleType

        public boolean isTupleType()
        Specified by:
        isTupleType in class org.apache.flink.api.common.typeinfo.TypeInformation<T>

      • getArity

        public int getArity()
        Specified by:
        getArity in class org.apache.flink.api.common.typeinfo.TypeInformation<T>

      • getTotalFields

        public int getTotalFields()
        Specified by:
        getTotalFields in class org.apache.flink.api.common.typeinfo.TypeInformation<T>

      • getTypeClass

        public Class<T> getTypeClass()
        Specified by:
        getTypeClass in class org.apache.flink.api.common.typeinfo.TypeInformation<T>

      • isKeyType

        public boolean isKeyType()
        Specified by:
        isKeyType in class org.apache.flink.api.common.typeinfo.TypeInformation<T>

      • createSerializer

        public org.apache.flink.api.common.typeutils.TypeSerializer<T> createSerializer​(org.apache.flink.api.common.serialization.SerializerConfig config)
        Specified by:
        createSerializer in class org.apache.flink.api.common.typeinfo.TypeInformation<T>

      • toString

        public String toString()
        Specified by:
        toString in class org.apache.flink.api.common.typeinfo.TypeInformation<T>

      • equals

        public boolean equals​(Object o)
        Specified by:
        equals in class org.apache.flink.api.common.typeinfo.TypeInformation<T>

      • hashCode

        public int hashCode()
        Specified by:
        hashCode in class org.apache.flink.api.common.typeinfo.TypeInformation<T>

      • canEqual

        public boolean canEqual​(Object obj)
        Specified by:
        canEqual in class org.apache.flink.api.common.typeinfo.TypeInformation<T>