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https://issues.apache.org/jira/browse/SPARK-29186?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16936770#comment-16936770
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Hyukjin Kwon commented on SPARK-29186:
--------------------------------------
Can you reformat the description with \{code\} ... \{code\} with correct
indentation? Looks impossible to read.
> SubqueryAlias name value is null in Spark 2.4.3 Logical plan.
> -------------------------------------------------------------
>
> Key: SPARK-29186
> URL: https://issues.apache.org/jira/browse/SPARK-29186
> Project: Spark
> Issue Type: Bug
> Components: Spark Core
> Affects Versions: 2.4.3
> Environment: I have tried this on AWS Glue with Spark 2.4.3
> and on windows 10 with 2.4.4
> at both of them facing same issue
> Reporter: Tarun Khaneja
> Priority: Blocker
> Fix For: 2.2.1
>
>
> I am writing a program to analyze sql query. So I am using Spark logical
> plan.I am writing a program to analyze sql query. So I am using Spark logical
> plan.
> Below is the code which I am using
> object QueryAnalyzer
> { val LOG = LoggerFactory.getLogger(this.getClass) //Spark Conf val
> conf = new
> SparkConf().setMaster("local[2]").setAppName("LocalEdlExecutor") //Spark
> Context val sc = new SparkContext(conf) //sql Context val
> sqlContext = new SQLContext(sc) //Spark Session val sparkSession =
> SparkSession .builder() .appName("Spark User Data")
> .config("spark.app.name", "LocalEdl") .getOrCreate() def main(args:
> Array[String])
> { var inputDfColumns = Map[String,List[String]]() val
> dfSession = sparkSession. read. format("csv").
> option("header", EdlConstants.TRUE). option("inferschema",
> EdlConstants.TRUE). option("delimiter", ","). option("decoding",
> EdlConstants.UTF8). option("multiline", true) var oDF =
> dfSession. load("C:\\Users\\tarun.khaneja\\data\\order.csv")
> println("smaple data in oDF====>") oDF.show() var cusDF =
> dfSession. load("C:\\Users\\tarun.khaneja\\data\\customer.csv")
> println("smaple data in cusDF====>") cusDF.show()
> oDF.createOrReplaceTempView("orderTempView")
> cusDF.createOrReplaceTempView("customerTempView") //get input
> columns from all dataframe inputDfColumns +=
> ("orderTempView"->oDF.columns.toList) inputDfColumns +=
> ("customerTempView"->cusDF.columns.toList) val res =
> sqlContext.sql("""select OID, max(MID+CID) as MID_new,ROW_NUMBER() OVER (
> ORDER BY CID) as rn from
> (select OID_1 as OID, CID_1 as CID, OID_1+CID_1 as MID from
> (select min(ot.OrderID) as OID_1, ct.CustomerID as
> CID_1 from orderTempView as ot inner join
> customerTempView as ct on ot.CustomerID =
> ct.CustomerID group by CID_1)) group by OID,CID""")
> println(res.show(false)) val analyzedPlan
> = res.queryExecution.analyzed println(analyzedPlan.prettyJson)
> }
>
> Now problem is, with *Spark 2.2.1*, I am getting below json. where I have
> SubqueryAlias which provide important information of alias name for table
> which we used in query, as shown below.
> ... ... ... [ \{ "class" :
> "org.apache.spark.sql.catalyst.expressions.AttributeReference",
> "num-children" : 0, "name" : "OrderDate", "dataType" : "string", "nullable" :
> true, "metadata" : { }, "exprId" : \{ "product-class" :
> "org.apache.spark.sql.catalyst.expressions.ExprId", "id" : 2, "jvmId" :
> "acefe6e6-e469-4c9a-8a36-5694f054dc0a" }, "isGenerated" : false } ] ] },
> { "class" : "org.apache.spark.sql.catalyst.plans.logical.*SubqueryAlias*",
> "num-children" : 1, "alias" : "ct", "child" : 0 }
> ,
> { "class" : "org.apache.spark.sql.catalyst.plans.logical.*SubqueryAlias*",
> "num-children" : 1, "alias" : "customertempview", "child" : 0 }
> , { "class" : "org.apache.spark.sql.execution.datasources.LogicalRelation",
> "num-children" : 0, "relation" : null, "output" :
> ... ... ...
> But with *Spark 2.4.3*, I am getting SubqueryAlias name as null. As shown
> below in json.
> ... ... \{ "class":
> "org.apache.spark.sql.catalyst.expressions.AttributeReference",
> "num-children": 0, "name": "CustomerID", "dataType": "integer", "nullable":
> true, "metadata": {}, "exprId": \{ "product-class":
> "org.apache.spark.sql.catalyst.expressions.ExprId", "id": 19, "jvmId":
> "3b0dde0c-0b8f-4c63-a3ed-4dba526f8331" }, "qualifier": "[ct]" }] },
> { "class": "org.apache.spark.sql.catalyst.plans.logical.*SubqueryAlias*",
> "num-children": 1, "name": null, "child": 0 }
> ,
> { "class": "org.apache.spark.sql.catalyst.plans.logical.*SubqueryAlias*",
> "num-children": 1, "name": null, "child": 0 }
> , { "class": "org.apache.spark.sql.execution.datasources.LogicalRelation",
> "num-children": 0, "relation": null, "output":
> ... ...
> So, I am not sure if it is bug in Spark 2.4 because of which I am getting
> name as null in SubquerAlias.Or if it is not bug then how can I get relation
> between alias name and real table name.
> Any idea on this?
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