[HUDI-2114] Spark Query MOR Table Written By Flink Return Incorrect T…

hudi-spark-datasource/hudi-spark/src/main/scala/org/apache/hudi/MergeOnReadIncrementalRelation.scala

@@ -111,15 +111,9 @@ class MergeOnReadIncrementalRelation(val sqlContext: SQLContext,
       val lessThanFilter = LessThanOrEqual(HoodieRecord.COMMIT_TIME_METADATA_FIELD, commitsToReturn.last.getTimestamp)
       filters :+isNotNullFilter :+ largerThanFilter :+ lessThanFilter
     }
-    var requiredStructSchema = StructType(Seq())
-    requiredColumns.foreach(col => {
-      val field = tableStructSchema.find(_.name == col)
-      if (field.isDefined) {
-        requiredStructSchema = requiredStructSchema.add(field.get)
-      }
-    })
-    val requiredAvroSchema = AvroConversionUtils
-      .convertStructTypeToAvroSchema(requiredStructSchema, tableAvroSchema.getName, tableAvroSchema.getNamespace)
+    val (requiredAvroSchema, requiredStructSchema) =
+      MergeOnReadSnapshotRelation.getRequiredSchema(tableAvroSchema, requiredColumns)
+
     val hoodieTableState = HoodieMergeOnReadTableState(
       tableStructSchema,
       requiredStructSchema,

hudi-spark-datasource/hudi-spark/src/main/scala/org/apache/hudi/MergeOnReadSnapshotRelation.scala

@@ -18,6 +18,7 @@
 
 package org.apache.hudi
 
+import org.apache.avro.Schema
 import org.apache.hudi.common.model.HoodieBaseFile
 import org.apache.hudi.common.table.{HoodieTableMetaClient, TableSchemaResolver}
 import org.apache.hudi.common.table.view.HoodieTableFileSystemView
@@ -94,16 +95,9 @@ class MergeOnReadSnapshotRelation(val sqlContext: SQLContext,
   override def buildScan(requiredColumns: Array[String], filters: Array[Filter]): RDD[Row] = {
     log.debug(s" buildScan requiredColumns = ${requiredColumns.mkString(",")}")
     log.debug(s" buildScan filters = ${filters.mkString(",")}")
-    var requiredStructSchema = StructType(Seq())
-    requiredColumns.foreach(col => {
-      val field = tableStructSchema.find(_.name == col)
-      if (field.isDefined) {
-        requiredStructSchema = requiredStructSchema.add(field.get)
-      }
-    })
-    val requiredAvroSchema = AvroConversionUtils
-      .convertStructTypeToAvroSchema(requiredStructSchema, tableAvroSchema.getName, tableAvroSchema.getNamespace)
 
+    val (requiredAvroSchema, requiredStructSchema) =
+      MergeOnReadSnapshotRelation.getRequiredSchema(tableAvroSchema, requiredColumns)
     val fileIndex = buildFileIndex(filters)
     val hoodieTableState = HoodieMergeOnReadTableState(
       tableStructSchema,
@@ -211,4 +205,15 @@ object MergeOnReadSnapshotRelation {
     // when create PartitionedFile.
     path.toUri.toString
   }
+
+  def getRequiredSchema(tableAvroSchema: Schema, requiredColumns: Array[String]): (Schema, StructType) = {
+    // First get the required avro-schema, then convert the avro-schema to spark schema.
+    val name2Fields = tableAvroSchema.getFields.asScala.map(f => f.name() -> f).toMap
+    val requiredFields = requiredColumns.map(c => name2Fields(c))
+      .map(f => new Schema.Field(f.name(), f.schema(), f.doc(), f.defaultVal(), f.order())).toList
+    val requiredAvroSchema = Schema.createRecord(tableAvroSchema.getName, tableAvroSchema.getDoc,
+      tableAvroSchema.getNamespace, tableAvroSchema.isError, requiredFields.asJava)
+    val requiredStructSchema = AvroConversionUtils.convertAvroSchemaToStructType(requiredAvroSchema)
+    (requiredAvroSchema, requiredStructSchema)
+  }
 }

hudi-spark-datasource/hudi-spark/src/test/scala/org/apache/hudi/TestMergeOnReadSnapshotRelation.scala

@@ -0,0 +1,50 @@
+/*
+ * 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.hudi
+
+import org.apache.avro.Schema
+import org.apache.spark.sql.types.TimestampType
+import org.junit.jupiter.api.Assertions.assertEquals
+import org.junit.jupiter.api.Test
+
+class TestMergeOnReadSnapshotRelation {
+
+  @Test
+  def testGetRequiredSchema(): Unit = {
+    val avroSchemaString = "{\"type\":\"record\",\"name\":\"record\"," +
+      "\"fields\":[{\"name\":\"_hoodie_commit_time\",\"type\":[\"null\",\"string\"],\"doc\":\"\",\"default\":null}," +
+      "{\"name\":\"_hoodie_commit_seqno\",\"type\":[\"null\",\"string\"],\"doc\":\"\",\"default\":null}," +
+      "{\"name\":\"_hoodie_record_key\",\"type\":[\"null\",\"string\"],\"doc\":\"\",\"default\":null}," +
+      "{\"name\":\"_hoodie_partition_path\",\"type\":[\"null\",\"string\"],\"doc\":\"\",\"default\":null}," +
+      "{\"name\":\"_hoodie_file_name\",\"type\":[\"null\",\"string\"],\"doc\":\"\",\"default\":null}," +
+      "{\"name\":\"uuid\",\"type\":\"string\"},{\"name\":\"name\",\"type\":[\"null\",\"string\"],\"default\":null}," +
+      "{\"name\":\"age\",\"type\":[\"null\",\"int\"],\"default\":null}," +
+      "{\"name\":\"ts\",\"type\":[\"null\",{\"type\":\"long\",\"logicalType\":\"timestamp-millis\"}],\"default\":null}," +
+      "{\"name\":\"partition\",\"type\":[\"null\",\"string\"],\"default\":null}]}"
+
+    val tableAvroSchema = new Schema.Parser().parse(avroSchemaString)
+
+    val (requiredAvroSchema, requiredStructSchema) =
+      MergeOnReadSnapshotRelation.getRequiredSchema(tableAvroSchema, Array("ts"))
+
+    assertEquals("timestamp-millis",
+      requiredAvroSchema.getField("ts").schema().getTypes.get(1).getLogicalType.getName)
+    assertEquals(TimestampType, requiredStructSchema.fields(0).dataType)
+  }
+}