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https://issues.apache.org/jira/browse/CARBONDATA-108?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Liang Chen updated CARBONDATA-108:
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Fix Version/s: (was: 0.2.0-incubating)
> Remove unnecessary Project for CarbonScan
> -----------------------------------------
>
> Key: CARBONDATA-108
> URL: https://issues.apache.org/jira/browse/CARBONDATA-108
> Project: CarbonData
> Issue Type: Improvement
> Components: spark-integration
> Reporter: Jacky Li
>
> For this SQL:
> select ch, sum(c) from (select ch,count(1) as c from t1 group by ch) temp
> where c > 1 group by ch
> Physical plan is:
> == Physical Plan ==
> Limit 21
> ConvertToSafe
> CarbonDictionaryDecoder [CarbonDecoderRelation(Map(word#22 -> word#22,
> ch#23 -> ch#23, value#24L ->
> value#24L),CarbonDatasourceRelation(`default`.`t1`,None))],
> ExcludeProfile(ArrayBuffer()), CarbonAliasDecoderRelation()
> TungstenAggregate(key=[ch#23],
> functions=[(sum(c#18L),mode=Final,isDistinct=false)], output=[ch#23,_c1#25L])
> TungstenAggregate(key=[ch#23],
> functions=[(sum(c#18L),mode=Partial,isDistinct=false)],
> output=[ch#23,currentSum#48L])
> Filter (c#18L > 1)
> TungstenAggregate(key=[ch#23],
> functions=[(count(1),mode=Final,isDistinct=false)], output=[ch#23,c#18L])
> TungstenExchange hashpartitioning(ch#23)
> TungstenAggregate(key=[ch#23],
> functions=[(count(1),mode=Partial,isDistinct=false)],
> output=[ch#23,currentCount#52L])
> Project [ch#23]
> ConvertToSafe
> CarbonScan [ch#23], (CarbonRelation default, t1,
> CarbonMetaData(ArrayBuffer(word,
> ch),ArrayBuffer(value),org.carbondata.core.carbon.metadata.schema.table.CarbonTable@6034ef16,DictionaryMap(Map(word
> -> true, ch -> true))),
> TableMeta(default_t1,/Users/jackylk/code/incubator-carbondata/target/store,org.carbondata.core.carbon.metadata.schema.table.CarbonTable@6034ef16,Partitioner(org.carbondata.spark.partition.api.impl.SampleDataPartitionerImpl,[Ljava.lang.String;@450458d7,1,[Ljava.lang.String;@f8a969d)),
> None), true
> The Project is unnecessary since CarbonScan only scan the requested column
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