[GitHub] [carbondata] qiuchenjian commented on a change in pull request #3150: [CARBONDATA-3309] MV datamap supports Spark 2.1

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qiuchenjian commented on a change in pull request #3150: [CARBONDATA-3309] MV datamap supports Spark 2.1
URL: https://github.com/apache/carbondata/pull/3150#discussion_r283696557
 
 

 ##########
 File path: integration/spark-common/src/main/scala/org/apache/spark/sql/util/SparkSQLUtil.scala
 ##########
 @@ -51,6 +55,100 @@ object SparkSQLUtil {
     }
   }
 
+  def invokeQueryPlannormalizeExprId(r: NamedExpression, input: AttributeSeq)
+      : NamedExpression = {
+    if (SparkUtil.isSparkVersionXandAbove("2.2")) {
+      val clazz = Utils.classForName("org.apache.spark.sql.catalyst.plans.QueryPlan")
+      clazz.getDeclaredMethod("normalizeExprId", classOf[Any], classOf[AttributeSeq]).
+        invoke(null, r, input).asInstanceOf[NamedExpression]
+    } else {
+      r
+    }
+  }
+
+  def getStatisticsObj(outputList: Seq[NamedExpression],
+                       plan: LogicalPlan, stats: Statistics,
+                       aliasMap: Option[AttributeMap[Attribute]] = None)
+  : Statistics = {
+    val className = "org.apache.spark.sql.catalyst.plans.logical.Statistics"
+    if (SparkUtil.isSparkVersionXandAbove("2.2")) {
+      val output = outputList.map(_.toAttribute)
+      val mapSeq = plan.collect { case n: logical.LeafNode => n }.map {
+        table => AttributeMap(table.output.zip(output))
+      }
+      val rewrites = mapSeq.head
+      val attributes : AttributeMap[ColumnStat] = CarbonReflectionUtils.
+        getField("attributeStats", stats).asInstanceOf[AttributeMap[ColumnStat]]
+      var attributeStats = AttributeMap(attributes.iterator
+        .map { pair => (rewrites(pair._1), pair._2) }.toSeq)
+      if (aliasMap.isDefined) {
+        attributeStats = AttributeMap(
+          attributeStats.map(pair => (aliasMap.get(pair._1), pair._2)).toSeq)
+      }
+      val hints = CarbonReflectionUtils.getField("hints", stats).asInstanceOf[Object]
+      CarbonReflectionUtils.createObject(className, stats.sizeInBytes,
+        stats.rowCount, attributeStats, hints).asInstanceOf[Statistics]
+    } else {
+      val output = outputList.map(_.name)
+      val mapSeq = plan.collect { case n: logical.LeafNode => n }.map {
+        table => table.output.map(_.name).zip(output).toMap
+      }
+      val rewrites = mapSeq.head
+      val colStats = CarbonReflectionUtils.getField("colStats", stats)
+        .asInstanceOf[Map[String, ColumnStat]]
+      var attributeStats = colStats.iterator
+        .map { pair => (rewrites(pair._1), pair._2) }.toMap
+      if (aliasMap.isDefined) {
+        val aliasMapName = aliasMap.get.map(x => (x._1.name, x._2.name))
+        attributeStats =
+          attributeStats.map(pair => (aliasMapName.getOrElse(pair._1, pair._1)
+            , pair._2))
+      }
+      CarbonReflectionUtils.createObject(className, stats.sizeInBytes,
+        stats.rowCount, attributeStats).asInstanceOf[Statistics]
+    }
+  }
+
+  def getCastObj(child: Expression, oriCast: Cast) : Cast = {
 
 Review comment:
   done

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