parquet.avro.package-info Maven / Gradle / Ivy
/**
* Copyright 2012 Twitter, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/**
*
*
* Provides classes to store Avro data in Parquet files. Avro schemas are converted to
* parquet schemas as follows. Only record schemas are converted,
* other top-level schema types are not converted and attempting to do so will result
* in an error. Avro types are converted to Parquet types using the mapping shown here:
*
*
*
*
* Avro type
* Parquet type
*
*
* null
* no type (the field is not encoded in Parquet), unless a null union
*
*
* boolean
* boolean
*
*
* int
* int32
*
*
* long
* int64
*
*
* float
* float
*
*
* double
* double
*
*
* bytes
* binary
*
*
* string
* binary (with original type UTF8)
*
*
* record
* group containing nested fields
*
*
* enum
* binary (with original type ENUM)
*
*
* array
* group (with original type LIST) containing one repeated group field
*
*
* map
* group (with original type MAP) containing one repeated group
* field (with original type MAP_KEY_VALUE) of (key, value)
*
*
* fixed
* fixed_len_byte_array
*
*
* union
* an optional type, in the case of a null union, otherwise not supported
*
*
*/
package parquet.avro;