cloud-fan commented on a change in pull request #32850:
URL: https://github.com/apache/spark/pull/32850#discussion_r656221248



##########
File path: core/src/main/scala/org/apache/spark/SparkError.scala
##########
@@ -0,0 +1,85 @@
+/*
+ * 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
+
+import java.net.URL
+
+import scala.collection.immutable.SortedMap
+
+import com.fasterxml.jackson.annotation.JsonIgnore
+import com.fasterxml.jackson.core.`type`.TypeReference
+import com.fasterxml.jackson.databind.SerializationFeature
+import com.fasterxml.jackson.databind.json.JsonMapper
+import com.fasterxml.jackson.module.scala.DefaultScalaModule
+
+import org.apache.spark.util.Utils
+
+/**
+ * Information associated with an error class.
+ *
+ * @param sqlState SQLSTATE associated with this class.
+ * @param message C-style message format compatible with printf.
+ *                The error message is constructed by concatenating the lines 
with newlines.
+ */
+case class ErrorInfo(sqlState: Option[String], message: Seq[String]) {
+  // For compatibility with multi-line error messages
+  @JsonIgnore
+  val messageFormat: String = message.mkString("\n")
+}
+
+/**
+ * Companion object used by instances of [[SparkError]] to access error class 
information and
+ * construct error messages.
+ */
+object SparkError {
+  val errorClassesUrl: URL =
+    Utils.getSparkClassLoader.getResource("error/error-classes.json")
+  val mapper: JsonMapper = JsonMapper.builder()

Review comment:
       nit: if `mapper` is only an intermediate value, let's not expose it and 
allow it to be GCed
   ```
   val errorClassToInfoMap: SortedMap[String, ErrorInfo] = {
     val mapper = ...
     ...
   }
   ```




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