[
https://issues.apache.org/jira/browse/BEAM-8933?focusedWorklogId=378551&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-378551
]
ASF GitHub Bot logged work on BEAM-8933:
----------------------------------------
Author: ASF GitHub Bot
Created on: 28/Jan/20 23:01
Start Date: 28/Jan/20 23:01
Worklog Time Spent: 10m
Work Description: emkornfield commented on pull request #10384:
[BEAM-8933] Utilities for converting Arrow schemas and reading Arrow batches as
Rows
URL: https://github.com/apache/beam/pull/10384#discussion_r372107178
##########
File path:
sdks/java/extensions/arrow/src/main/java/org/apache/beam/sdk/extensions/arrow/ArrowConversion.java
##########
@@ -0,0 +1,448 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you 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.
+ */
+package org.apache.beam.sdk.extensions.arrow;
+
+import static
org.apache.beam.vendor.guava.v26_0_jre.com.google.common.base.Preconditions.checkArgument;
+
+import java.util.Iterator;
+import java.util.List;
+import java.util.function.Function;
+import java.util.stream.Collectors;
+import javax.annotation.Nullable;
+import org.apache.arrow.vector.FieldVector;
+import org.apache.arrow.vector.VectorSchemaRoot;
+import org.apache.arrow.vector.types.TimeUnit;
+import org.apache.arrow.vector.types.pojo.ArrowType;
+import org.apache.arrow.vector.util.Text;
+import org.apache.beam.sdk.annotations.Experimental;
+import org.apache.beam.sdk.schemas.CachingFactory;
+import org.apache.beam.sdk.schemas.Factory;
+import org.apache.beam.sdk.schemas.FieldValueGetter;
+import org.apache.beam.sdk.schemas.Schema;
+import org.apache.beam.sdk.schemas.Schema.Field;
+import org.apache.beam.sdk.schemas.Schema.FieldType;
+import org.apache.beam.sdk.schemas.logicaltypes.FixedBytes;
+import org.apache.beam.sdk.values.Row;
+import org.joda.time.DateTime;
+import org.joda.time.DateTimeZone;
+
+/**
+ * Utilities to create {@link Iterable}s of Beam {@link Row} instances backed
by Arrow record
+ * batches.
+ */
+@Experimental(Experimental.Kind.SCHEMAS)
+public class ArrowConversion {
+ /** Converts Arrow schema to Beam row schema. */
+ public static Schema toBeamSchema(org.apache.arrow.vector.types.pojo.Schema
schema) {
+ return toBeamSchema(schema.getFields());
+ }
+
+ public static Schema
toBeamSchema(List<org.apache.arrow.vector.types.pojo.Field> fields) {
+ Schema.Builder builder = Schema.builder();
+ for (org.apache.arrow.vector.types.pojo.Field field : fields) {
+ Field beamField = toBeamField(field);
+ builder.addField(beamField);
+ }
+ return builder.build();
+ }
+
+ /** Get Beam Field from Arrow Field. */
+ private static Field toBeamField(org.apache.arrow.vector.types.pojo.Field
field) {
+ FieldType beamFieldType = toFieldType(field.getFieldType(),
field.getChildren());
+ return Field.of(field.getName(), beamFieldType);
+ }
+
+ /** Converts Arrow FieldType to Beam FieldType. */
+ private static FieldType toFieldType(
+ org.apache.arrow.vector.types.pojo.FieldType arrowFieldType,
+ List<org.apache.arrow.vector.types.pojo.Field> childrenFields) {
+ FieldType fieldType =
+ arrowFieldType
+ .getType()
+ .accept(
+ new ArrowType.ArrowTypeVisitor<FieldType>() {
+ @Override
+ public FieldType visit(ArrowType.Null type) {
+ throw new IllegalArgumentException(
+ "Type \'" + type.toString() + "\' not supported.");
+ }
+
+ @Override
+ public FieldType visit(ArrowType.Struct type) {
+ return FieldType.row(toBeamSchema(childrenFields));
+ }
+
+ @Override
+ public FieldType visit(ArrowType.List type) {
+ checkArgument(
+ childrenFields.size() == 1,
+ "Encountered "
+ + childrenFields.size()
+ + " child fields for list type, expected 1");
+ return
FieldType.array(toBeamField(childrenFields.get(0)).getType());
+ }
+
+ @Override
+ public FieldType visit(ArrowType.FixedSizeList type) {
+ throw new IllegalArgumentException(
+ "Type \'" + type.toString() + "\' not supported.");
+ }
+
+ @Override
+ public FieldType visit(ArrowType.Union type) {
+ throw new IllegalArgumentException(
+ "Type \'" + type.toString() + "\' not supported.");
+ }
+
+ @Override
+ public FieldType visit(ArrowType.Map type) {
+ checkArgument(
+ childrenFields.size() == 2,
+ "Encountered "
+ + childrenFields.size()
+ + " child fields for map type, expected 2");
+ return FieldType.map(
+ toBeamField(childrenFields.get(0)).getType(),
+ toBeamField(childrenFields.get(1)).getType());
+ }
+
+ @Override
+ public FieldType visit(ArrowType.Int type) {
+ if (!type.getIsSigned()) {
+ throw new IllegalArgumentException("Unsigned integers
are not supported.");
+ }
+ switch (type.getBitWidth()) {
+ case 8:
+ return FieldType.BYTE;
+ case 16:
+ return FieldType.INT16;
+ case 32:
+ return FieldType.INT32;
+ case 64:
+ return FieldType.INT64;
+ default:
+ throw new IllegalArgumentException(
+ "Unsupported integer bit width: " +
type.getBitWidth());
+ }
+ }
+
+ @Override
+ public FieldType visit(ArrowType.FloatingPoint type) {
+ switch (type.getPrecision()) {
+ case SINGLE:
+ return FieldType.FLOAT;
+ case DOUBLE:
+ return FieldType.DOUBLE;
+ default:
+ throw new IllegalArgumentException(
+ "Unsupported floating-point precision: " +
type.getPrecision().name());
+ }
+ }
+
+ @Override
+ public FieldType visit(ArrowType.Utf8 type) {
+ return FieldType.STRING;
+ }
+
+ @Override
+ public FieldType visit(ArrowType.Binary type) {
+ return FieldType.BYTES;
+ }
+
+ @Override
+ public FieldType visit(ArrowType.FixedSizeBinary type) {
+ return
FieldType.logicalType(FixedBytes.of(type.getByteWidth()));
+ }
+
+ @Override
+ public FieldType visit(ArrowType.Bool type) {
+ return FieldType.BOOLEAN;
+ }
+
+ @Override
+ public FieldType visit(ArrowType.Decimal type) {
+ // FieldType.DECIMAL isn't perfect here since arrow
decimal has a
+ // scale/precision fixed by the schema, but
FieldType.DECIMAL uses a BigDecimal,
+ // whose precision/scale can change from row to row.
+ throw new IllegalArgumentException(
+ "Type \'" + type.toString() + "\' not supported.");
+ }
+
+ @Override
+ public FieldType visit(ArrowType.Date type) {
+ throw new IllegalArgumentException(
+ "Type \'" + type.toString() + "\' not supported.");
+ }
+
+ @Override
+ public FieldType visit(ArrowType.Time type) {
+ throw new IllegalArgumentException(
+ "Type \'" + type.toString() + "\' not supported.");
+ }
+
+ @Override
+ public FieldType visit(ArrowType.Timestamp type) {
+ if (type.getUnit() == TimeUnit.MILLISECOND
+ || type.getUnit() == TimeUnit.MICROSECOND) {
+ return FieldType.DATETIME;
+ } else {
+ throw new IllegalArgumentException(
+ "Unsupported timestamp unit: " +
type.getUnit().name());
+ }
+ }
+
+ @Override
+ public FieldType visit(ArrowType.Interval type) {
+ throw new IllegalArgumentException(
+ "Type \'" + type.toString() + "\' not supported.");
+ }
+
+ @Override
+ public FieldType visit(ArrowType.Duration type) {
+ throw new IllegalArgumentException(
+ "Type \'" + type.toString() + "\' not supported.");
+ }
+ });
+ return fieldType.withNullable(arrowFieldType.isNullable());
+ }
+
+ /**
+ * Returns an {@link Iterable<Row>} backed by the Arrow record batch stored
in {@code
+ * vectorSchemaRoot}.
+ *
+ * <p>Note this is a lazy interface. The data in the underlying Arrow buffer
is not read until a
+ * field of one of the returned {@link Row}s is accessed.
+ */
+ public static Iterable<Row> rowsFromRecordBatch(
+ Schema schema, VectorSchemaRoot vectorSchemaRoot) {
+ return new RecordBatchIterable(schema, vectorSchemaRoot);
+ }
+
+ public static Iterable<Row> rowsFromRecordBatch(VectorSchemaRoot
vectorSchemaRoot) {
+ return rowsFromRecordBatch(toBeamSchema(vectorSchemaRoot.getSchema()),
vectorSchemaRoot);
+ }
+
+ private static class VectorSchemaRootRowIterator implements Iterator<Row> {
+ private static final ArrowValueConverterVisitor valueConverterVisitor =
+ new ArrowValueConverterVisitor();
+ private final Schema schema;
+ private final VectorSchemaRoot vectorSchemaRoot;
+ private final Factory<List<FieldValueGetter>> fieldValueGetters;
+ private Integer currRowIndex;
+
+ private static class FieldVectorListValueGetterFactory
+ implements Factory<List<FieldValueGetter>> {
+ private final List<FieldVector> fieldVectors;
+
+ static FieldVectorListValueGetterFactory of(List<FieldVector>
fieldVectors) {
+ return new FieldVectorListValueGetterFactory(fieldVectors);
+ }
+
+ private FieldVectorListValueGetterFactory(List<FieldVector>
fieldVectors) {
+ this.fieldVectors = fieldVectors;
+ }
+
+ @Override
+ public List<FieldValueGetter> create(Class<?> clazz, Schema schema) {
+ return this.fieldVectors.stream()
+ .map(
+ (fieldVector) -> {
+ Function<Object, Object> conversionFunction =
+
fieldVector.getField().getFieldType().getType().accept(valueConverterVisitor);
+ if (conversionFunction == null) {
+ return new FieldValueGetter<Integer, Object>() {
+ @Nullable
+ @Override
+ public Object get(Integer rowIndex) {
+ return fieldVector.getObject(rowIndex);
+ }
+
+ @Override
+ public String name() {
+ return fieldVector.getField().getName();
+ }
+ };
+ } else {
+ return new FieldValueGetter<Integer, Object>() {
+ @Nullable
+ @Override
+ public Object get(Integer rowIndex) {
+ Object value = fieldVector.getObject(rowIndex);
+ if (value == null) {
+ return null;
+ }
+
+ return conversionFunction.apply(value);
+ }
+
+ @Override
+ public String name() {
+ return fieldVector.getField().getName();
+ }
+ };
+ }
+ })
+ .collect(Collectors.toList());
+ }
+ }
+
+ // TODO: Consider using ByteBuddyUtils.TypeConversion for this
+ private static class ArrowValueConverterVisitor
+ implements ArrowType.ArrowTypeVisitor<Function<Object, Object>> {
+ @Override
+ public Function<Object, Object> visit(ArrowType.Null type) {
+ throw new IllegalArgumentException("Type \'" + type.toString() + "\'
not supported.");
+ }
+
+ @Override
+ public Function<Object, Object> visit(ArrowType.Struct type) {
+ // TODO: code to create a row.
+ return null;
+ }
+
+ @Override
+ public Function<Object, Object> visit(ArrowType.List type) {
+ return null;
+ }
+
+ @Override
+ public Function<Object, Object> visit(ArrowType.FixedSizeList type) {
+ throw new IllegalArgumentException("Type \'" + type.toString() + "\'
not supported.");
+ }
+
+ @Override
+ public Function<Object, Object> visit(ArrowType.Union type) {
+ throw new IllegalArgumentException("Type \'" + type.toString() + "\'
not supported.");
+ }
+
+ @Override
+ public Function<Object, Object> visit(ArrowType.Map type) {
+ throw new IllegalArgumentException("Type \'" + type.toString() + "\'
not supported.");
+ }
+
+ @Override
+ public Function<Object, Object> visit(ArrowType.Duration type) {
+ throw new IllegalArgumentException("Type \'" + type.toString() + "\'
not supported.");
+ }
+
+ @Override
+ public Function<Object, Object> visit(ArrowType.Int type) {
+ return null;
+ }
+
+ @Override
+ public Function<Object, Object> visit(ArrowType.FloatingPoint type) {
+ return null;
+ }
+
+ @Override
+ public Function<Object, Object> visit(ArrowType.Utf8 type) {
+ return (Object text) -> ((Text) text).toString();
+ }
+
+ @Override
+ public Function<Object, Object> visit(ArrowType.Binary type) {
+ return null;
+ }
+
+ @Override
+ public Function<Object, Object> visit(ArrowType.FixedSizeBinary type) {
+ return null;
+ }
+
+ @Override
+ public Function<Object, Object> visit(ArrowType.Bool type) {
+ return null;
+ }
+
+ @Override
+ public Function<Object, Object> visit(ArrowType.Decimal type) {
+ throw new IllegalArgumentException("Type \'" + type.toString() + "\'
not supported.");
+ }
+
+ @Override
+ public Function<Object, Object> visit(ArrowType.Date type) {
+ throw new IllegalArgumentException("Type \'" + type.toString() + "\'
not supported.");
+ }
+
+ @Override
+ public Function<Object, Object> visit(ArrowType.Time type) {
+ throw new IllegalArgumentException("Type \'" + type.toString() + "\'
not supported.");
+ }
+
+ @Override
+ public Function<Object, Object> visit(ArrowType.Timestamp type) {
+ DateTimeZone tz = DateTimeZone.forID(type.getTimezone());
+ switch (type.getUnit()) {
+ case MICROSECOND:
+ return (epochMicros) -> new DateTime((long) epochMicros / 1000,
tz);
+ case MILLISECOND:
+ return (epochMills) -> new DateTime((long) epochMills, tz);
+ default:
+ throw new AssertionError("Encountered unrecognized TimeUnit: " +
type.getUnit());
+ }
+ }
+
+ @Override
+ public Function<Object, Object> visit(ArrowType.Interval type) {
+ throw new IllegalArgumentException("Type \'" + type.toString() + "\'
not supported.");
+ }
+ }
+
+ public VectorSchemaRootRowIterator(Schema schema, VectorSchemaRoot
vectorSchemaRoot) {
+ this.schema = schema;
+ this.vectorSchemaRoot = vectorSchemaRoot;
+ this.fieldValueGetters =
+ new CachingFactory<>(
+
FieldVectorListValueGetterFactory.of(vectorSchemaRoot.getFieldVectors()));
+ this.currRowIndex = 0;
+ }
+
+ @Override
+ public boolean hasNext() {
+ return currRowIndex < vectorSchemaRoot.getRowCount();
+ }
+
+ @Override
+ public Row next() {
+ Row result =
Review comment:
should there be a precondition check here that to assert there are more rows?
----------------------------------------------------------------
This is an automated message from the Apache Git Service.
To respond to the message, please log on to GitHub and use the
URL above to go to the specific comment.
For queries about this service, please contact Infrastructure at:
us...@infra.apache.org
Issue Time Tracking
-------------------
Worklog Id: (was: 378551)
Time Spent: 10h (was: 9h 50m)
> BigQuery IO should support read/write in Arrow format
> -----------------------------------------------------
>
> Key: BEAM-8933
> URL: https://issues.apache.org/jira/browse/BEAM-8933
> Project: Beam
> Issue Type: Improvement
> Components: io-java-gcp
> Reporter: Kirill Kozlov
> Assignee: Kirill Kozlov
> Priority: Major
> Time Spent: 10h
> Remaining Estimate: 0h
>
> As of right now BigQuery uses Avro format for reading and writing.
> We should add a config to BigQueryIO to specify which format to use: Arrow or
> Avro (with Avro as default).
--
This message was sent by Atlassian Jira
(v8.3.4#803005)
