Package org.apache.iceberg.flink

Class FlinkSchemaUtil

  • public class FlinkSchemaUtil
extends java.lang.Object
    Converter between Flink types and Iceberg type. The conversion is not a 1:1 mapping that not allows back-and-forth conversion. So some information might get lost during the back-and-forth conversion.

    This inconsistent types:

    • map Iceberg UUID type to Flink BinaryType(16)
    • map Flink VarCharType(_) and CharType(_) to Iceberg String type
    • map Flink VarBinaryType(_) to Iceberg Binary type
    • map Flink TimeType(_) to Iceberg Time type (microseconds)
    • map Flink TimestampType(_) to Iceberg Timestamp without zone type (microseconds)
    • map Flink LocalZonedTimestampType(_) to Iceberg Timestamp with zone type (microseconds)
    • map Flink MultiSetType to Iceberg Map type(element, int)

    • Method Summary

      All Methods Static Methods Concrete Methods 
      Modifier and Type Method Description
      static Schema convert​(org.apache.flink.table.api.TableSchema schema)
      Convert the flink table schema to apache iceberg schema.
      static org.apache.flink.table.types.logical.RowType convert​(Schema schema)
      Convert a Schema to a Flink type.
      static Schema convert​(Schema baseSchema, org.apache.flink.table.api.TableSchema flinkSchema)
      Convert a Flink TableSchema to a Schema based on the given schema.
      static org.apache.flink.table.types.logical.LogicalType convert​(Type type)
      Convert a Type to a Flink type.
      static org.apache.flink.table.api.TableSchema toSchema​(org.apache.flink.table.types.logical.RowType rowType)
      Convert a RowType to a TableSchema.
      static org.apache.flink.table.api.TableSchema toSchema​(Schema schema)
      Convert a Schema to a TableSchema.

      • Methods inherited from class java.lang.Object

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

    • Method Detail

      • convert

        public static Schema convert​(org.apache.flink.table.api.TableSchema schema)
        Convert the flink table schema to apache iceberg schema.

      • convert

        public static Schema convert​(Schema baseSchema,
                             org.apache.flink.table.api.TableSchema flinkSchema)
        Convert a Flink TableSchema to a Schema based on the given schema.

        This conversion does not assign new ids; it uses ids from the base schema.

        Data types, field order, and nullability will match the Flink type. This conversion may return a schema that is not compatible with base schema.

        Parameters:
        baseSchema - a Schema on which conversion is based
        flinkSchema - a Flink TableSchema
        Returns:
        the equivalent Schema
        Throws:
        java.lang.IllegalArgumentException - if the type cannot be converted or there are missing ids

      • convert

        public static org.apache.flink.table.types.logical.RowType convert​(Schema schema)
        Convert a Schema to a Flink type.
        Parameters:
        schema - a Schema
        Returns:
        the equivalent Flink type
        Throws:
        java.lang.IllegalArgumentException - if the type cannot be converted to Flink

      • convert

        public static org.apache.flink.table.types.logical.LogicalType convert​(Type type)
        Convert a Type to a Flink type.
        Parameters:
        type - a Type
        Returns:
        the equivalent Flink type
        Throws:
        java.lang.IllegalArgumentException - if the type cannot be converted to Flink

      • toSchema

        public static org.apache.flink.table.api.TableSchema toSchema​(org.apache.flink.table.types.logical.RowType rowType)
        Convert a RowType to a TableSchema.
        Parameters:
        rowType - a RowType
        Returns:
        Flink TableSchema

      • toSchema

        public static org.apache.flink.table.api.TableSchema toSchema​(Schema schema)
        Convert a Schema to a TableSchema.
        Parameters:
        schema - iceberg schema to convert.
        Returns:
        Flink TableSchema.