{"action":"created","comment":{"url":"https://api.github.com/repos/apache/spark/pulls/comments/51237908","id":51237908,"diff_hunk":"@@ -800,9 +800,21 @@ private[sql] object ParquetRelation extends Logging {\n               assumeInt96IsTimestamp = assumeInt96IsTimestamp,\n               writeLegacyParquetFormat = writeLegacyParquetFormat)\n \n-          footers.map { footer =>\n-            ParquetRelation.readSchemaFromFooter(footer, converter)\n-          }.reduceLeftOption(_ merge _).iterator\n+          if (footers.isEmpty) {\n+            Iterator.empty\n+          } else {\n+            var mergedSchema = ParquetRelation.readSchemaFromFooter(footers.head, converter)\n+            footers.tail.foreach { footer =>\n+              val schema = ParquetRelation.readSchemaFromFooter(footer, converter)\n+              try {\n+                mergedSchema = mergedSchema.merge(schema)\n+              } catch { case cause: SparkException =>\n+                throw new SparkException(\n+                  s\"Failed merging schema of file ${footer.getFile}:\\n${schema.treeString}\", cause)\n+              }\n+            }\n+            Iterator.single(mergedSchema)\n+          }\n         }.collect()\n \n     partiallyMergedSchemas.reduceLeftOption(_ merge _)","path":"sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/parquet/ParquetRelation.scala","position":24,"original_position":24,"commit_id":"2e594af83fd4d8ea30c5e88226f173220e0ed8a5","original_commit_id":"2e594af83fd4d8ea30c5e88226f173220e0ed8a5","user":{"login":"holdenk","id":59893,"avatar_url":"https://avatars.githubusercontent.com/u/59893?v=3","gravatar_id":"","url":"https://api.github.com/users/holdenk","html_url":"https://github.com/holdenk","followers_url":"https://api.github.com/users/holdenk/followers","following_url":"https://api.github.com/users/holdenk/following{/other_user}","gists_url":"https://api.github.com/users/holdenk/gists{/gist_id}","starred_url":"https://api.github.com/users/holdenk/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/holdenk/subscriptions","organizations_url":"https://api.github.com/users/holdenk/orgs","repos_url":"https://api.github.com/users/holdenk/repos","events_url":"https://api.github.com/users/holdenk/events{/privacy}","received_events_url":"https://api.github.com/users/holdenk/received_events","type":"User","site_admin":false},"body":"Might we also run into the same merge exception here?","created_at":"2016-01-29T08:58:32Z","updated_at":"2016-01-29T08:58:32Z","html_url":"https://github.com/apache/spark/pull/10979#discussion_r51237908","pull_request_url":"https://api.github.com/repos/apache/spark/pulls/10979","_links":{"self":{"href":"https://api.github.com/repos/apache/spark/pulls/comments/51237908"},"html":{"href":"https://github.com/apache/spark/pull/10979#discussion_r51237908"},"pull_request":{"href":"https://api.github.com/repos/apache/spark/pulls/10979"}}},"pull_request":{"url":"https://api.github.com/repos/apache/spark/pulls/10979","id":57619435,"html_url":"https://github.com/apache/spark/pull/10979","diff_url":"https://github.com/apache/spark/pull/10979.diff","patch_url":"https://github.com/apache/spark/pull/10979.patch","issue_url":"https://api.github.com/repos/apache/spark/issues/10979","number":10979,"state":"open","locked":false,"title":"[SPARK-13070][SQL] Better error message when Parquet schema merging fails","user":{"login":"viirya","id":68855,"avatar_url":"https://avatars.githubusercontent.com/u/68855?v=3","gravatar_id":"","url":"https://api.github.com/users/viirya","html_url":"https://github.com/viirya","followers_url":"https://api.github.com/users/viirya/followers","following_url":"https://api.github.com/users/viirya/following{/other_user}","gists_url":"https://api.github.com/users/viirya/gists{/gist_id}","starred_url":"https://api.github.com/users/viirya/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/viirya/subscriptions","organizations_url":"https://api.github.com/users/viirya/orgs","repos_url":"https://api.github.com/users/viirya/repos","events_url":"https://api.github.com/users/viirya/events{/privacy}","received_events_url":"https://api.github.com/users/viirya/received_events","type":"User","site_admin":false},"body":"Make sure we throw better error messages when Parquet schema merging 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