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ExampleRecordHandler.java
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ExampleRecordHandler.java
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package net.sambaiz.athena_connector_udf_example;
import com.amazonaws.athena.connector.lambda.QueryStatusChecker;
import com.amazonaws.athena.connector.lambda.data.Block;
import com.amazonaws.athena.connector.lambda.data.BlockSpiller;
import com.amazonaws.athena.connector.lambda.data.BlockUtils;
import com.amazonaws.athena.connector.lambda.data.FieldResolver;
import com.amazonaws.athena.connector.lambda.data.writers.GeneratedRowWriter;
import com.amazonaws.athena.connector.lambda.data.writers.extractors.Extractor;
import com.amazonaws.athena.connector.lambda.data.writers.extractors.IntExtractor;
import com.amazonaws.athena.connector.lambda.domain.predicate.ConstraintProjector;
import com.amazonaws.athena.connector.lambda.handlers.RecordHandler;
import com.amazonaws.athena.connector.lambda.records.ReadRecordsRequest;
import com.amazonaws.services.athena.AmazonAthenaClientBuilder;
import com.amazonaws.services.s3.AmazonS3ClientBuilder;
import com.amazonaws.services.secretsmanager.AWSSecretsManagerClientBuilder;
import com.google.common.base.Joiner;
import org.apache.arrow.vector.FieldVector;
import org.apache.arrow.vector.holders.NullableIntHolder;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;
public class ExampleRecordHandler extends RecordHandler {
private static final Logger logger = LoggerFactory.getLogger(ExampleRecordHandler.class);
private static final String SOURCE_TYPE = "example";
public ExampleRecordHandler()
{
super(AmazonS3ClientBuilder.defaultClient(), AWSSecretsManagerClientBuilder.defaultClient(), AmazonAthenaClientBuilder.defaultClient(), SOURCE_TYPE);
}
@Override
protected void readWithConstraint(BlockSpiller spiller, ReadRecordsRequest recordsRequest, QueryStatusChecker queryStatusChecker) throws IOException {
String splitProperties = Joiner.on(",").withKeyValueSeparator("=").join(recordsRequest.getSplit().getProperties());
logger.info("RecordHandler.readWithConstraint() with splitProperties: " + splitProperties);
GeneratedRowWriter.RowWriterBuilder builder = GeneratedRowWriter.newBuilder(recordsRequest.getConstraints());
builder.withExtractor("year", (IntExtractor) (Object context, NullableIntHolder value) -> {
value.isSet = 1;
value.value = Integer.parseInt(((String[]) context)[0]);
});
builder.withFieldWriterFactory("foo",
(FieldVector vector, Extractor extractor, ConstraintProjector constraint) ->
(Object context, int rowNum) -> {
Map<String, Object> eventMap = new HashMap<>();
eventMap.put("bar", Integer.parseInt(((String[])context)[1]));
BlockUtils.setComplexValue(vector, rowNum, FieldResolver.DEFAULT, eventMap);
return true;
});
GeneratedRowWriter rowWriter = builder.build();
int splitYear = recordsRequest.getSplit().getPropertyAsInt("year");
for (int i = 0; i < 5; i++) {
String[] data = {
String.valueOf(splitYear), /* year */
String.valueOf(i) /* foo.bar */
};
spiller.writeRows((Block block, int rowNum) -> rowWriter.writeRow(block, rowNum, data) ? 1 : 0);
}
}
}