Github user liancheng commented on a diff in the pull request:
https://github.com/apache/spark/pull/2576#discussion_r18769955
--- Diff:
sql/hive/src/main/scala/org/apache/spark/sql/hive/orc/OrcRelation.scala ---
@@ -0,0 +1,248 @@
+/*
+ * 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.hive.orc
+
+import java.util.Properties
+import java.io.IOException
+import org.apache.hadoop.hive.ql.stats.StatsSetupConst
+
+import scala.collection.mutable
+
+import org.apache.hadoop.fs.{FileSystem, Path}
+import org.apache.hadoop.conf.Configuration
+import org.apache.hadoop.fs.permission.FsAction
+import org.apache.hadoop.hive.serde2.objectinspector.StructObjectInspector
+import org.apache.hadoop.hive.ql.io.orc._
+import org.apache.hadoop.hive.ql.io.orc.OrcProto.Type.Kind
+
+import org.apache.spark.sql.parquet.FileSystemHelper
+import org.apache.spark.sql.SQLContext
+import org.apache.spark.sql.catalyst.plans.logical.{LogicalPlan, LeafNode}
+import org.apache.spark.sql.catalyst.analysis.{UnresolvedException,
MultiInstanceRelation}
+import org.apache.spark.sql.catalyst.expressions.Attribute
+import org.apache.spark.sql.catalyst.expressions.AttributeReference
+import org.apache.spark.sql.catalyst.types._
+
+
+private[sql] case class OrcRelation(
+ path: String,
+ @transient conf: Option[Configuration],
+ @transient sqlContext: SQLContext,
+ partitioningAttributes: Seq[Attribute] = Nil)
+ extends LeafNode with MultiInstanceRelation {
+ self: Product =>
+
+ val prop: Properties = new Properties
+
+ var rowClass: Class[_] = null
+
+ val fieldIdCache: mutable.Map[String, Int] = new mutable.HashMap[String,
Int]
+
+ val fieldNameTypeCache: mutable.Map[String, String] = new
mutable.HashMap[String, String]
+
+ override val output = orcSchema
+
+ override lazy val statistics = Statistics(sizeInBytes =
sqlContext.defaultSizeInBytes)
+
+ def orcSchema: Seq[Attribute] = {
+ val origPath = new Path(path)
+ val reader = OrcFileOperator.readMetaData(origPath, conf)
+
+ if (null != reader) {
+ val inspector =
reader.getObjectInspector.asInstanceOf[StructObjectInspector]
+ val fields = inspector.getAllStructFieldRefs
+
+ if (fields.size() == 0) {
+ return Seq.empty
+ }
+
+ val totalType = reader.getTypes.get(0)
+ val keys = totalType.getFieldNamesList
+ val types = totalType.getSubtypesList
+ log.info("field name is {}", keys)
+ log.info("types is {}", types)
+
+ val colBuff = new StringBuilder
+ val typeBuff = new StringBuilder
+ for (i <- 0 until fields.size()) {
+ val fieldName = fields.get(i).getFieldName
+ val typeName = fields.get(i).getFieldObjectInspector.getTypeName
+ colBuff.append(fieldName)
+ fieldNameTypeCache.put(fieldName, typeName)
+ fieldIdCache.put(fieldName, i)
+ colBuff.append(",")
+ typeBuff.append(typeName)
+ typeBuff.append(":")
+ }
+ colBuff.setLength(colBuff.length - 1)
+ typeBuff.setLength(typeBuff.length - 1)
+ prop.setProperty("columns", colBuff.toString())
+ prop.setProperty("columns.types", typeBuff.toString())
+ val attributes = convertToAttributes(reader, keys, types)
+ attributes
+ } else {
+ Seq.empty
+ }
+ }
+
+ def convertToAttributes(
+ reader: Reader,
+ keys: java.util.List[String],
+ types: java.util.List[Integer]): Seq[Attribute] = {
+ val range = 0.until(keys.size())
+ range.map {
+ i => reader.getTypes.get(types.get(i)).getKind match {
+ case Kind.BOOLEAN =>
+ new AttributeReference(keys.get(i), BooleanType, false)()
+ case Kind.STRING =>
+ new AttributeReference(keys.get(i), StringType, true)()
+ case Kind.BYTE =>
+ new AttributeReference(keys.get(i), ByteType, true)()
+ case Kind.SHORT =>
+ new AttributeReference(keys.get(i), ShortType, true)()
+ case Kind.INT =>
+ new AttributeReference(keys.get(i), IntegerType, true)()
+ case Kind.LONG =>
+ new AttributeReference(keys.get(i), LongType, false)()
+ case Kind.FLOAT =>
+ new AttributeReference(keys.get(i), FloatType, false)()
+ case Kind.DOUBLE =>
+ new AttributeReference(keys.get(i), DoubleType, false)()
+ case _ => {
+ log.info("unsupported datatype")
+ null
+ }
+ }
+ }
+ }
+
+ override def newInstance() = OrcRelation(path, conf,
sqlContext).asInstanceOf[this.type]
+}
+
+private[sql] object OrcRelation {
+ /**
+ * Creates a new OrcRelation and underlying Orcfile for the given
LogicalPlan. Note that
+ * this is used inside
[[org.apache.spark.sql.execution.SparkStrategies]] to
+ * create a resolved relation as a data sink for writing to a Orcfile.
+ *
+ * @param pathString The directory the ORCfile will be stored in.
+ * @param child The child node that will be used for extracting the
schema.
+ * @param conf A configuration to be used.
+ * @return An empty OrcRelation with inferred metadata.
+ */
+ def create(
+ pathString: String,
+ child: LogicalPlan,
+ conf: Configuration,
+ sqlContext: SQLContext): OrcRelation = {
+ if (!child.resolved) {
+ throw new UnresolvedException[LogicalPlan](
+ child,
+ "Attempt to create Orc table from unresolved child")
+ }
+ createEmpty(pathString, child.output, false, conf, sqlContext)
+ }
+
+ /**
+ * Creates an empty OrcRelation and underlying Orcfile that only
+ * consists of the Metadata for the given schema.
+ *
+ * @param pathString The directory the Orcfile will be stored in.
+ * @param attributes The schema of the relation.
+ * @param conf A configuration to be used.
+ * @return An empty OrcRelation.
+ */
+ def createEmpty(
+ pathString: String,
+ attributes: Seq[Attribute],
+ allowExisting: Boolean,
+ conf: Configuration,
+ sqlContext: SQLContext): OrcRelation = {
+ val path = checkPath(pathString, allowExisting, conf)
+
+ /** set compression kind in hive 0.13.1
+ * conf.set(
+ * HiveConf.ConfVars.OHIVE_ORC_DEFAULT_COMPRESS.varname,
+ * shortOrcCompressionCodecNames.getOrElse(
+ * sqlContext.orcCompressionCodec.toUpperCase,
CompressionKind.NONE).name)
+ */
+ val orcRelation = new OrcRelation(path.toString, Some(conf),
sqlContext)
+
+ orcRelation
--- End diff --
Don't need this temporary variable.
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