[GitHub] [spark] gengliangwang commented on a diff in pull request #41052: [SPARK-43380][SQL] Fix Avro data type conversion issues to avoid producing incorrect results

["gengliangwang (via GitHub)" <gi...@apache.org>]

gengliangwang commented on code in PR #41052:
URL: https://github.com/apache/spark/pull/41052#discussion_r1277804587


##########
connector/avro/src/main/scala/org/apache/spark/sql/avro/AvroDeserializer.scala:
##########
@@ -117,6 +119,10 @@ private[sql] class AvroDeserializer(
     val incompatibleMsg = errorPrefix +
         s"schema is incompatible (avroType = $avroType, sqlType = ${catalystType.sql})"
 
+    val realDataType = SchemaConverters.toSqlType(avroType).dataType
+    val confKey = SQLConf.LEGACY_AVRO_ALLOW_INCOMPATIBLE_SCHEMA
+    val preventReadingIncorrectType = !SQLConf.get.getConf(confKey)
+
     (avroType.getType, catalystType) match {

Review Comment:
   @zeruibao do you know the exact reason of the slowdown? The schema conversion is one-time thing on the driver. 



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