[CARBONDATA-2539] MV Dataset - Subqueries is not accessing the data from the MV datamap.

• Type: Bug
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Fix Version/s: 1.5.0, 1.4.1
• Component/s: data-query
• Environment: 3 node opensource ANT cluster.
• Assignee: Ravindra Pesala
• Reporter: Prasanna Ravichandran
• Created: 25/May/18 12:16
• Updated: 07/Aug/18 14:27
• Resolved: 25/Jul/18 06:32

Description

Inner subquery is not accessing the data from the MV datamap. It is accessing the data from the main table.

Test queries - Spark shell:

scala> carbon.sql("drop table if exists origintable").show()
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 scala> carbon.sql("CREATE TABLE originTable (empno int, empname String, designation String, doj Timestamp, workgroupcategory int, workgroupcategoryname String, deptno int, deptname String, projectcode int, projectjoindate Timestamp, projectenddate Timestamp,attendance int, utilization int,salary int) STORED BY 'org.apache.carbondata.format'").show(200,false)
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scala> carbon.sql("LOAD DATA local inpath 'hdfs://hacluster/user/prasanna/data.csv' INTO TABLE originTable OPTIONS('DELIMITER'= ',', 'QUOTECHAR'= '\"','timestampformat'='dd-MM-yyyy')").show(200,false)
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scala> carbon.sql("drop datamap datamap_subqry").show(200,false)
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scala> carbon.sql("create datamap datamap_subqry using 'mv' as select min(salary) from originTable group by empno").show(200,false)
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scala> carbon.sql("explain SELECT max(empno) FROM originTable WHERE salary IN (select min(salary) from originTable group by empno ) group by empname").show(200,false)
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plan

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== CarbonData Profiler == Table Scan on origintable total blocklets: 2 filter: none pruned by Main DataMap skipped blocklets: 0 Table Scan on origintable total blocklets: 2 filter: none pruned by Main DataMap skipped blocklets: 0

== Physical Plan == *HashAggregate(keys=empname#2132, functions=max(empno#2131)) +- Exchange hashpartitioning(empname#2132, 200) +- *HashAggregate(keys=empname#2132, functions=partial_max(empno#2131)) +- *Project empno#2131, empname#2132 +- *BroadcastHashJoin salary#2144, *min(salary*)#2219, LeftSemi, BuildRight :- BatchedScan CarbonDatasourceHadoopRelation [ *Database name :default, Table name :origintable, Schema :Some(StructType(StructField(empno,IntegerType,true), StructField(empname,StringType,true), StructField(designation,StringType,true), StructField(doj,TimestampType,true), StructField(workgroupcategory,IntegerType,true), StructField(workgroupcategoryname,StringType,true), StructField(deptno,IntegerType,true), StructField(deptname,StringType,true), StructField(projectcode,IntegerType,true), StructField(projectjoindate,TimestampType,true), StructField(projectenddate,TimestampType,true), StructField(attendance,IntegerType,true), StructField(utilization,IntegerType,true), StructField(salary,IntegerType,true))) ] default.origintableempno#2131,empname#2132,designation#2133,doj#2134,workgroupcategory#2135,workgroupcategoryname#2136,deptno#2137,deptname#2138,projectcode#2139,projectjoindate#2140,projectenddate#2141,attendance#2142,utilization#2143,salary#2144 +- BroadcastExchange HashedRelationBroadcastMode(List(cast(input[0, int, true] as bigint))) +- *HashAggregate(keys=empno#2131, functions=min(salary#2144)) +- Exchange hashpartitioning(empno#2131, 200) +- *HashAggregate(keys=empno#2131, functions=partial_min(salary#2144)) +- *BatchedScan CarbonDatasourceHadoopRelation [ Database name :default, Table name :origintable, Schema :Some(StructType(StructField(empno,IntegerType,true), StructField(empname,StringType,true), StructField(designation,StringType,true), StructField(doj,TimestampType,true), StructField(workgroupcategory,IntegerType,true), StructField(workgroupcategoryname,StringType,true), StructField(deptno,IntegerType,true), StructField(deptname,StringType,true), StructField(projectcode,IntegerType,true), StructField(projectjoindate,TimestampType,true), StructField(projectenddate,TimestampType,true), StructField(attendance,IntegerType,true), StructField(utilization,IntegerType,true), StructField(salary,IntegerType,true))) ] default.origintableempno#2131,salary#2144

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Issue Links

• is a child of: CARBONDATA-2628 Fix MV defects
• links to: GitHub Pull Request #2477
• links to: GitHub Pull Request #2602