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The Athena Query Federation SDK defines a set of interfaces and wire protocols that you can implement to enable Athena to delegate portions of it's query execution plan to code that you deploy/write.
package com.amazonaws.athena.connector.lambda.serde;
/*-
* #%L
* Amazon Athena Query Federation SDK
* %%
* Copyright (C) 2019 Amazon Web Services
* %%
* 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.
* #L%
*/
import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.DeserializationContext;
import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.deser.std.StdDeserializer;
import org.apache.arrow.vector.types.pojo.Schema;
import java.io.ByteArrayInputStream;
import java.io.IOException;
/**
* Used to enhance Jackson's stock ObjectMapper with the ability to deserialize Apache Arrow Schema objects.
*
* @deprecated {@link com.amazonaws.athena.connector.lambda.serde.v3.SchemaSerDeV3} should be used instead
*/
@Deprecated
public class SchemaDeserializer
extends StdDeserializer
{
private final com.amazonaws.athena.connector.lambda.data.SchemaSerDe serDe = new com.amazonaws.athena.connector.lambda.data.SchemaSerDe();
public SchemaDeserializer()
{
super(Schema.class);
}
@Override
public Schema deserialize(JsonParser jsonParser, DeserializationContext deserializationContext)
throws IOException, JsonProcessingException
{
JsonNode node = jsonParser.getCodec().readTree(jsonParser);
byte[] schemaBytes = node.get(SchemaSerializer.SCHEMA_FIELD_NAME).binaryValue();
return serDe.deserialize(new ByteArrayInputStream(schemaBytes));
}
}