gengliangwang commented on code in PR #37972: URL: https://github.com/apache/spark/pull/37972#discussion_r992803194
########## connector/protobuf/src/main/scala/org/apache/spark/sql/protobuf/ProtobufDeserializer.scala: ########## @@ -0,0 +1,380 @@ +/* + * 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.concurrent.TimeUnit + +import com.google.protobuf.{ByteString, DynamicMessage, Message} +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, DateTimeUtils, GenericArrayData} +import org.apache.spark.sql.errors.QueryCompilationErrors +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._ +import org.apache.spark.unsafe.types.UTF8String + +private[sql] class ProtobufDeserializer( + rootDescriptor: Descriptor, + rootCatalystType: DataType, + filters: StructFilters) { + + def this(rootDescriptor: Descriptor, rootCatalystType: DataType) = { + this(rootDescriptor, rootCatalystType, new NoopFilters) + } + + private val converter: Any => Option[InternalRow] = + 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: Message): Option[InternalRow] = 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 QueryCompilationErrors.nullableArrayOrMapElementError(protoElementPath) + } 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 keyField = protoType.getMessageType.getFields.get(0) + val valueField = protoType.getMessageType.getFields.get(1) + val keyWriter = newWriter(keyField, keyType, protoPath :+ "key", catalystPath :+ "key") + val valueWriter = + newWriter(valueField, valueType, protoPath :+ "value", catalystPath :+ "value") + (updater, ordinal, value) => + if (value != null) { + val messageList = value.asInstanceOf[java.util.List[com.google.protobuf.Message]] + val valueArray = createArrayData(valueType, messageList.size()) + val valueUpdater = new ArrayDataUpdater(valueArray) + val keyArray = createArrayData(keyType, messageList.size()) + val keyUpdater = new ArrayDataUpdater(keyArray) + var i = 0 + messageList.forEach { field => + { + keyWriter(keyUpdater, i, field.getField(keyField)) + if (field.getField(valueField) == null) { + if (!valueContainsNull) { + throw QueryCompilationErrors.nullableArrayOrMapElementError(protoPath) + } else { + valueUpdater.setNullAt(i) + } + } else { + valueWriter(valueUpdater, i, field.getField(valueField)) + } + } + 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, ByteType) => + (updater, ordinal, value) => updater.setByte(ordinal, value.asInstanceOf[Byte]) + + case (INT, ShortType) => + (updater, ordinal, value) => updater.setShort(ordinal, value.asInstanceOf[Short]) + + case (INT, ArrayType(IntegerType, containsNull)) => Review Comment: Again, feel free to improve it in a followup PR -- This is an automated message from the Apache Git Service. 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