This workaround looks good to me. In this way, all queries are still
executed lazily within a single DAG, and Spark SQL is capable to
optimize the query plan as a whole.
On 9/29/14 11:26 AM, twinkle sachdeva wrote:
Thanks Cheng.
For the time being , As a work around, I had applied the schema
to Queryresult1, and then registered the result as temp table.
Although that works, but I was not sure of performance impact, as that
might block some optimisation in some scenarios.
This flow (on spark 1.1 ) works:
registerTempTable(cachedSchema)
Queryresult1 = Query1 using cachedSchema [ works ]
*queryResult1withSchema = hiveContext.applySchema( Queryresult1,
Queryresult1.schema )*
registerTempTable(*queryResult1withSchema*)
Queryresult2 = Query2 using *queryResult1withSchema* [ *works* ]
On Fri, Sep 26, 2014 at 5:13 PM, Cheng Lian <lian.cs....@gmail.com
<mailto:lian.cs....@gmail.com>> wrote:
H Twinkle,
The failure is caused by case sensitivity. The temp table actually
stores the original un-analyzed logical plan, thus field names
remain capital (F1, F2, etc.). I believe this issue has already
been fixed by PR #2382
<https://github.com/apache/spark/pull/2382>. As a workaround, you
can use lowercase letters in field names instead.
Cheng
On 9/25/14 1:18 PM, twinkle sachdeva wrote:
Hi,
I am using Hive Context to fire the sql queries inside spark. I
have created a schemaRDD( Let's call it cachedSchema ) inside my
code.
If i fire a sql query ( Query 1 ) on top of it, then it works.
But if I refer to Query1's result inside another sql, that fails.
Note that I have already registered Query1's result as temp table.
registerTempTable(cachedSchema)
Queryresult1 = Query1 using cachedSchema [ works ]
registerTempTable(Queryresult1)
Queryresult2 = Query2 using Queryresult1 [ FAILS ]
Is it expected?? Any known work around?
Following is the exception I am receiving :
*org.apache.spark.sql.catalyst.errors.package$TreeNodeException:
Unresolved attributes: 'f1,'f2,'f3,'f4, tree:*
*Project ['f1,'f2,'f3,'f4]*
* Filter ('count > 3)*
* LowerCaseSchema *
* Subquery x*
* Project ['F1,'F2,'F3,'F4,'F6,'Count]*
* LowerCaseSchema *
* Subquery src*
* SparkLogicalPlan (ExistingRdd
[F1#0,F2#1,F3#2,F4#3,F5#4,F6#5,Count#6], MappedRDD[4] at map at
SQLBlock.scala:64)*
*at
org.apache.spark.sql.catalyst.analysis.Analyzer$CheckResolution$anonfun$apply$1.applyOrElse(Analyzer.scala:72)*
*at
org.apache.spark.sql.catalyst.analysis.Analyzer$CheckResolution$anonfun$apply$1.applyOrElse(Analyzer.scala:70)*
*at
org.apache.spark.sql.catalyst.trees.TreeNode.transformDown(TreeNode.scala:165)*
*at
org.apache.spark.sql.catalyst.trees.TreeNode.transform(TreeNode.scala:156)*
*at
org.apache.spark.sql.catalyst.analysis.Analyzer$CheckResolution$.apply(Analyzer.scala:70)*
*at
org.apache.spark.sql.catalyst.analysis.Analyzer$CheckResolution$.apply(Analyzer.scala:68)*
*at
org.apache.spark.sql.catalyst.rules.RuleExecutor$anonfun$apply$1$anonfun$apply$2.apply(RuleExecutor.scala:61)*
*at
org.apache.spark.sql.catalyst.rules.RuleExecutor$anonfun$apply$1$anonfun$apply$2.apply(RuleExecutor.scala:59)*
*at
scala.collection.IndexedSeqOptimized$class.foldl(IndexedSeqOptimized.scala:51)*
*at
scala.collection.IndexedSeqOptimized$class.foldLeft(IndexedSeqOptimized.scala:60)*
*at
scala.collection.mutable.WrappedArray.foldLeft(WrappedArray.scala:34)*
*at
org.apache.spark.sql.catalyst.rules.RuleExecutor$anonfun$apply$1.apply(RuleExecutor.scala:59)*
*at
org.apache.spark.sql.catalyst.rules.RuleExecutor$anonfun$apply$1.apply(RuleExecutor.scala:51)*
*at scala.collection.immutable.List.foreach(List.scala:318)*
*at
org.apache.spark.sql.catalyst.rules.RuleExecutor.apply(RuleExecutor.scala:51)*
*at
org.apache.spark.sql.SQLContext$QueryExecution.analyzed$lzycompute(SQLContext.scala:397)*
*at
org.apache.spark.sql.SQLContext$QueryExecution.analyzed(SQLContext.scala:397)*
*at
org.apache.spark.sql.hive.HiveContext$QueryExecution.optimizedPlan$lzycompute(HiveContext.scala:358)*
*at
org.apache.spark.sql.hive.HiveContext$QueryExecution.optimizedPlan(HiveContext.scala:357)*
*at
org.apache.spark.sql.SQLContext$QueryExecution.sparkPlan$lzycompute(SQLContext.scala:402)*
*at
org.apache.spark.sql.SQLContext$QueryExecution.sparkPlan(SQLContext.scala:400)*
*at
org.apache.spark.sql.SQLContext$QueryExecution.executedPlan$lzycompute(SQLContext.scala:406)*
*at
org.apache.spark.sql.SQLContext$QueryExecution.executedPlan(SQLContext.scala:406)*
*at
org.apache.spark.sql.hive.HiveContext$QueryExecution.toRdd$lzycompute(HiveContext.scala:360)*
*at
org.apache.spark.sql.hive.HiveContext$QueryExecution.toRdd(HiveContext.scala:360)*
*at
org.apache.spark.sql.SchemaRDD.getDependencies(SchemaRDD.scala:120)*
*at
org.apache.spark.rdd.RDD$anonfun$dependencies$2.apply(RDD.scala:191)*
*at
org.apache.spark.rdd.RDD$anonfun$dependencies$2.apply(RDD.scala:189)*
