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https://issues.apache.org/jira/browse/DRILL-4071?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Suresh Ollala updated DRILL-4071:
---------------------------------
Reviewer: Rahul Challapalli
> Partition pruning fails when a Coalesce() function appears with partition
> filter
> --------------------------------------------------------------------------------
>
> Key: DRILL-4071
> URL: https://issues.apache.org/jira/browse/DRILL-4071
> Project: Apache Drill
> Issue Type: Bug
> Components: Query Planning & Optimization
> Reporter: Aman Sinha
> Assignee: Mehant Baid
> Fix For: 1.3.0
>
> Attachments: DRILL-4071.patch
>
>
> Pruning fails for this query:
> {code}
> 0: jdbc:drill:zk=local> explain plan for select count(*) from
> dfs.`/Users/asinha/data/multilevel/parquet` where dir0 = 1994 and
> coalesce(o_clerk, 'Clerk') = '';
> +------+------+
> | text | json |
> +------+------+
> | 00-00 Screen
> 00-01 Project(EXPR$0=[$0])
> 00-02 StreamAgg(group=[{}], EXPR$0=[COUNT()])
> 00-03 Project($f0=[0])
> 00-04 SelectionVectorRemover
> 00-05 Filter(condition=[AND(=($0, 1994), =(CASE(IS NOT NULL($1),
> $1, 'Clerk'), ''))])
> 00-06 Scan(groupscan=[ParquetGroupScan
> [entries=[ReadEntryWithPath
> [path=file:/Users/asinha/data/multilevel/parquet/1994/Q1/orders_94_q1.parquet],
> ReadEntryWithPath
> [path=file:/Users/asinha/data/multilevel/parquet/1994/Q2/orders_94_q2.parquet],
> ReadEntryWithPath
> [path=file:/Users/asinha/data/multilevel/parquet/1994/Q3/orders_94_q3.parquet],
> ReadEntryWithPath
> [path=file:/Users/asinha/data/multilevel/parquet/1994/Q4/orders_94_q4.parquet],
> ReadEntryWithPath
> [path=file:/Users/asinha/data/multilevel/parquet/1995/Q1/orders_95_q1.parquet],
> ReadEntryWithPath
> [path=file:/Users/asinha/data/multilevel/parquet/1995/Q2/orders_95_q2.parquet],
> ReadEntryWithPath
> [path=file:/Users/asinha/data/multilevel/parquet/1995/Q3/orders_95_q3.parquet],
> ReadEntryWithPath
> [path=file:/Users/asinha/data/multilevel/parquet/1995/Q4/orders_95_q4.parquet],
> ReadEntryWithPath
> [path=file:/Users/asinha/data/multilevel/parquet/1996/Q1/orders_96_q1.parquet],
> ReadEntryWithPath
> [path=file:/Users/asinha/data/multilevel/parquet/1996/Q2/orders_96_q2.parquet],
> ReadEntryWithPath
> [path=file:/Users/asinha/data/multilevel/parquet/1996/Q3/orders_96_q3.parquet],
> ReadEntryWithPath
> [path=file:/Users/asinha/data/multilevel/parquet/1996/Q4/orders_96_q4.parquet]],
> selectionRoot=file:/Users/asinha/data/multilevel/parquet, numFiles=12,
> usedMetadataFile=false, columns=[`dir0`, `o_clerk`]]])
> {code}
> The log indicates no partition filters were found:
> {code}
> ...
> o.a.d.e.p.l.partition.PruneScanRule - No conditions were found eligible for
> partition pruning.Total pruning elapsed time: 0 ms
> {code}
> A preliminary analysis indicates that since the Coalesce gets converted to a
> CASE(IS NOT NULL....) expression, the filter analysis does not correctly
> process the full expression tree. At one point in
> {{FindPartitionConditions.analyzeCall()}} I saw the operandStack had 3
> elements in it: [NO_PUSH, NO_PUSH, PUSH] which seemed strange since I would
> expect even number of elements.
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