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Posted to reviews@spark.apache.org by GitBox <gi...@apache.org> on 2022/10/05 23:59:09 UTC
[GitHub] [spark] SandishKumarHN commented on a diff in pull request #37972: [SPARK-40654][SQL] Protobuf support for Spark - from_proto AND to_proto
SandishKumarHN commented on code in PR #37972:
URL: https://github.com/apache/spark/pull/37972#discussion_r988443095
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connector/protobuf/src/main/scala/org/apache/spark/sql/protobuf/ProtobufDeserializer.scala:
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@@ -0,0 +1,373 @@
+/*
+ * 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.spark.sql.protobuf
+
+import java.util
+
+import com.google.protobuf.{ByteString, DynamicMessage}
+import com.google.protobuf.Descriptors._
+import com.google.protobuf.Descriptors.FieldDescriptor.JavaType._
+
+import org.apache.spark.sql.catalyst.{InternalRow, NoopFilters, StructFilters}
+import org.apache.spark.sql.catalyst.expressions.{SpecificInternalRow, UnsafeArrayData}
+import org.apache.spark.sql.catalyst.util.{ArrayBasedMapData, ArrayData, GenericArrayData}
+import org.apache.spark.sql.protobuf.utils.ProtobufUtils
+import org.apache.spark.sql.protobuf.utils.ProtobufUtils.ProtoMatchedField
+import org.apache.spark.sql.protobuf.utils.ProtobufUtils.toFieldStr
+import org.apache.spark.sql.protobuf.utils.SchemaConverters.IncompatibleSchemaException
+import org.apache.spark.sql.types.{ArrayType, BinaryType, BooleanType, ByteType, DataType, Decimal, DoubleType, FloatType, IntegerType, LongType, MapType, NullType, ShortType, StringType, StructType}
+import org.apache.spark.unsafe.types.UTF8String
+
+private[sql] class ProtobufDeserializer(
+ rootDescriptor: Descriptor,
+ rootCatalystType: DataType,
+ positionalFieldMatch: Boolean,
+ filters: StructFilters) {
+
+ def this(
+ rootDescriptor: Descriptor,
+ rootCatalystType: DataType) = {
+ this(
+ rootDescriptor,
+ rootCatalystType,
+ positionalFieldMatch = false,
+ new NoopFilters)
+ }
+
+ private val converter: Any => Option[Any] = try {
+ rootCatalystType match {
+ // A shortcut for empty schema.
+ case st: StructType if st.isEmpty =>
+ (_: Any) => Some(InternalRow.empty)
+
+ case st: StructType =>
+ val resultRow = new SpecificInternalRow(st.map(_.dataType))
+ val fieldUpdater = new RowUpdater(resultRow)
+ val applyFilters = filters.skipRow(resultRow, _)
+ val writer = getRecordWriter(rootDescriptor, st, Nil, Nil, applyFilters)
+ (data: Any) => {
+ val record = data.asInstanceOf[DynamicMessage]
+ val skipRow = writer(fieldUpdater, record)
+ if (skipRow) None else Some(resultRow)
+ }
+ }
+ } catch {
+ case ise: IncompatibleSchemaException => throw new IncompatibleSchemaException(
+ s"Cannot convert Protobuf type ${rootDescriptor.getName} " +
+ s"to SQL type ${rootCatalystType.sql}.", ise)
+ }
+
+ def deserialize(data: Any): Option[Any] = converter(data)
+
+ private def newArrayWriter(
+ protoField: FieldDescriptor,
+ protoPath: Seq[String],
+ catalystPath: Seq[String],
+ elementType: DataType,
+ containsNull: Boolean): (CatalystDataUpdater, Int, Any) => Unit = {
+
+
+ val protoElementPath = protoPath :+ "element"
+ val elementWriter = newWriter(protoField, elementType,
+ protoElementPath, catalystPath :+ "element")
+ (updater, ordinal, value) =>
+ val collection = value.asInstanceOf[java.util.Collection[Any]]
+ val result = createArrayData(elementType, collection.size())
+ val elementUpdater = new ArrayDataUpdater(result)
+
+ var i = 0
+ val iterator = collection.iterator()
+ while (iterator.hasNext) {
+ val element = iterator.next()
+ if (element == null) {
+ if (!containsNull) {
+ throw new RuntimeException(
+ s"Array value at path ${toFieldStr(protoElementPath)} is not allowed to be null")
+ } else {
+ elementUpdater.setNullAt(i)
+ }
+ } else {
+ elementWriter(elementUpdater, i, element)
+ }
+ i += 1
+ }
+
+ updater.set(ordinal, result)
+ }
+
+ private def newMapWriter(
+ protoType: FieldDescriptor,
+ protoPath: Seq[String],
+ catalystPath: Seq[String],
+ keyType: DataType,
+ valueType: DataType,
+ valueContainsNull: Boolean): (CatalystDataUpdater, Int, Any) => Unit = {
+
+ val keyWriter = newWriter(protoType.getMessageType.getFields.get(0), keyType,
+ protoPath :+ "key", catalystPath :+ "key")
+ val valueWriter = newWriter(protoType.getMessageType.getFields.get(1), valueType,
+ protoPath :+ "value", catalystPath :+ "value")
+ (updater, ordinal, value) =>
+ if (value != null) {
+ val messageList = value.asInstanceOf[java.util.List[com.google.protobuf.Message]]
+ val map = new util.HashMap[AnyRef, AnyRef]()
+ messageList.forEach {
+ field => {
+ var key: AnyRef = null
+ var value: AnyRef = null
+ field.getAllFields.forEach {
+ (k, v) => {
+ k.getName match {
+ case "key" =>
+ key = v
+ case "value" =>
+ value = v
+ }
+ }
+ }
+ map.put(key, value)
+ }
+ }
+ val keyArray = createArrayData(keyType, map.size())
+ val keyUpdater = new ArrayDataUpdater(keyArray)
+ val valueArray = createArrayData(valueType, map.size())
+ val valueUpdater = new ArrayDataUpdater(valueArray)
+ val iter = map.entrySet().iterator()
+ var i = 0
+ while (iter.hasNext) {
+ val entry = iter.next()
+ assert(entry.getKey != null)
+ keyWriter(keyUpdater, i, entry.getKey)
+ if (entry.getValue == null) {
+ if (!valueContainsNull) {
+ throw new RuntimeException(
+ s"Map value at path ${toFieldStr(protoPath :+ "value")} is not allowed to be null")
+ } else {
+ valueUpdater.setNullAt(i)
+ }
+ } else {
+ valueWriter(valueUpdater, i, entry.getValue)
+ }
+ i += 1
+ }
+ updater.set(ordinal, new ArrayBasedMapData(keyArray, valueArray))
+ }
+ }
+
+ /**
+ * Creates a writer to write Protobuf values to Catalyst values at the given ordinal with
+ * the given updater.
+ */
+ private def newWriter(
+ protoType: FieldDescriptor,
+ catalystType: DataType,
+ protoPath: Seq[String],
+ catalystPath: Seq[String]): (CatalystDataUpdater, Int, Any) => Unit = {
+ val errorPrefix = s"Cannot convert Protobuf ${toFieldStr(protoPath)} to " +
+ s"SQL ${toFieldStr(catalystPath)} because "
+ val incompatibleMsg = errorPrefix +
+ s"schema is incompatible (protoType = ${protoType} ${protoType.toProto.getLabel} " +
+ s"${protoType.getJavaType} ${protoType.getType}, sqlType = ${catalystType.sql})"
+
+ (protoType.getJavaType, catalystType) match {
+
+ case (null, NullType) => (updater, ordinal, _) =>
+ updater.setNullAt(ordinal)
+
+ // TODO: we can avoid boxing if future version of Protobuf provide primitive accessors.
+ case (BOOLEAN, BooleanType) => (updater, ordinal, value) =>
+ updater.setBoolean(ordinal, value.asInstanceOf[Boolean])
+
+ case (BOOLEAN, ArrayType(BooleanType, containsNull)) =>
+ newArrayWriter(protoType, protoPath,
+ catalystPath, BooleanType, containsNull)
+
+ case (INT, IntegerType) => (updater, ordinal, value) =>
+ updater.setInt(ordinal, value.asInstanceOf[Int])
+
+ case (INT, ArrayType(IntegerType, containsNull)) =>
+ newArrayWriter(protoType, protoPath,
+ catalystPath, IntegerType, containsNull)
+
+ case (LONG, LongType) => (updater, ordinal, value) =>
+ updater.setLong(ordinal, value.asInstanceOf[Long])
+
+ case (LONG, ArrayType(LongType, containsNull)) =>
+ newArrayWriter(protoType, protoPath,
+ catalystPath, LongType, containsNull)
+
+ case (FLOAT, FloatType) => (updater, ordinal, value) =>
+ updater.setFloat(ordinal, value.asInstanceOf[Float])
+
+ case (FLOAT, ArrayType(FloatType, containsNull)) =>
+ newArrayWriter(protoType, protoPath,
+ catalystPath, FloatType, containsNull)
+
+ case (DOUBLE, DoubleType) => (updater, ordinal, value) =>
+ updater.setDouble(ordinal, value.asInstanceOf[Double])
+
+ case (DOUBLE, ArrayType(DoubleType, containsNull)) =>
+ newArrayWriter(protoType, protoPath,
+ catalystPath, DoubleType, containsNull)
+
+ case (STRING, StringType) => (updater, ordinal, value) =>
+ val str = value match {
+ case s: String => UTF8String.fromString(s)
+ }
+ updater.set(ordinal, str)
+
+ case (STRING, ArrayType(StringType, containsNull)) =>
+ newArrayWriter(protoType, protoPath,
+ catalystPath, StringType, containsNull)
+
+ case (BYTE_STRING, BinaryType) => (updater, ordinal, value) =>
+ val byte_array = value match {
+ case s: ByteString => s.toByteArray
+ case _ => throw new Exception("Invalid ByteString format")
+ }
+ updater.set(ordinal, byte_array)
+
+ case (BYTE_STRING, ArrayType(BinaryType, containsNull)) =>
+ newArrayWriter(protoType, protoPath,
+ catalystPath, BinaryType, containsNull)
+
+ case (MESSAGE, MapType(keyType, valueType, valueContainsNull)) =>
+ newMapWriter(protoType, protoPath, catalystPath,
+ keyType, valueType, valueContainsNull)
+
+ case (MESSAGE, st: StructType) =>
+ val writeRecord = getRecordWriter(protoType.getMessageType, st, protoPath,
+ catalystPath, applyFilters = _ => false)
+ (updater, ordinal, value) =>
+ val row = new SpecificInternalRow(st)
+ writeRecord(new RowUpdater(row), value.asInstanceOf[DynamicMessage])
+ updater.set(ordinal, row)
+
+ case (MESSAGE, ArrayType(st: StructType, containsNull)) =>
+ newArrayWriter(protoType, protoPath,
+ catalystPath, st, containsNull)
+
+ case (ENUM, StringType) => (updater, ordinal, value) =>
+ updater.set(ordinal, UTF8String.fromString(value.toString))
+
+ case (ENUM, ArrayType(StringType, containsNull)) =>
+ newArrayWriter(protoType, protoPath,
+ catalystPath, StringType, containsNull)
+
+ case _ => throw new IncompatibleSchemaException(incompatibleMsg)
+ }
+ }
+
+
+ private def getRecordWriter(
+ protoType: Descriptor,
+ catalystType: StructType,
+ protoPath: Seq[String],
+ catalystPath: Seq[String],
+ applyFilters: Int => Boolean):
+ (CatalystDataUpdater, DynamicMessage) => Boolean = {
+
+ val protoSchemaHelper = new ProtobufUtils.ProtoSchemaHelper(
+ protoType, catalystType, protoPath, catalystPath, positionalFieldMatch)
+
+ // protoSchemaHelper.validateNoExtraCatalystFields(ignoreNullable = true)
Review Comment:
added a comment to revisit.
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