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Posted to issues@beam.apache.org by "Rui Wang (JIRA)" <ji...@apache.org> on 2018/10/16 20:20:00 UTC
[jira] [Commented] (BEAM-5384) [SQL] Calcite optimizes away
LogicalProject
[ https://issues.apache.org/jira/browse/BEAM-5384?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16652385#comment-16652385 ]
Rui Wang commented on BEAM-5384:
--------------------------------
I have seen that in BeamSQL, LogicalProject is gone for query "SELECT key, COUNT(*) FROM TABLE GROUP BY key".
> [SQL] Calcite optimizes away LogicalProject
> -------------------------------------------
>
> Key: BEAM-5384
> URL: https://issues.apache.org/jira/browse/BEAM-5384
> Project: Beam
> Issue Type: Bug
> Components: dsl-sql
> Reporter: Anton Kedin
> Priority: Major
>
> *From [https://stackoverflow.com/questions/52313324/beam-sql-wont-work-when-using-aggregation-in-statement-cannot-plan-execution] :*
> I have a basic Beam pipeline that reads from GCS, does a Beam SQL transform and writes the results to BigQuery.
> When I don't do any aggregation in my SQL statement it works fine:
> {code:java}
> ..
> PCollection<Row> outputStream =
> sqlRows.apply(
> "sql_transform",
> SqlTransform.query("select views from PCOLLECTION"));
> outputStream.setCoder(SCHEMA.getRowCoder());
> ..
> {code}
> However, when I try to aggregate with a sum then it fails (throws a CannotPlanException exception):
> {code:java}
> ..
> PCollection<Row> outputStream =
> sqlRows.apply(
> "sql_transform",
> SqlTransform.query("select wikimedia_project, sum(views) from PCOLLECTION group by wikimedia_project"));
> outputStream.setCoder(SCHEMA.getRowCoder());
> ..
> {code}
> Stacktrace:
> {code:java}
> Step #1: 11:47:37,562 0 [main] INFO org.apache.beam.runners.dataflow.DataflowRunner - PipelineOptions.filesToStage was not specified. Defaulting to files from the classpath: will stage 117 files. Enable logging at DEBUG level to see which files will be staged.
> Step #1: 11:47:39,845 2283 [main] INFO org.apache.beam.sdk.extensions.sql.impl.BeamQueryPlanner - SQL:
> Step #1: SELECT `PCOLLECTION`.`wikimedia_project`, SUM(`PCOLLECTION`.`views`)
> Step #1: FROM `beam`.`PCOLLECTION` AS `PCOLLECTION`
> Step #1: GROUP BY `PCOLLECTION`.`wikimedia_project`
> Step #1: 11:47:40,387 2825 [main] INFO org.apache.beam.sdk.extensions.sql.impl.BeamQueryPlanner - SQLPlan>
> Step #1: LogicalAggregate(group=[{0}], EXPR$1=[SUM($1)])
> Step #1: BeamIOSourceRel(table=[[beam, PCOLLECTION]])
> Step #1:
> Step #1: Exception in thread "main" org.apache.beam.repackaged.beam_sdks_java_extensions_sql.org.apache.calcite.plan.RelOptPlanner$CannotPlanException: Node [rel#7:Subset#1.BEAM_LOGICAL.[]] could not be implemented; planner state:
> Step #1:
> Step #1: Root: rel#7:Subset#1.BEAM_LOGICAL.[]
> Step #1: Original rel:
> Step #1: LogicalAggregate(subset=[rel#7:Subset#1.BEAM_LOGICAL.[]], group=[{0}], EXPR$1=[SUM($1)]): rowcount = 10.0, cumulative cost = {11.375000476837158 rows, 0.0 cpu, 0.0 io}, id = 5
> Step #1: BeamIOSourceRel(subset=[rel#4:Subset#0.BEAM_LOGICAL.[]], table=[[beam, PCOLLECTION]]): rowcount = 100.0, cumulative cost = {100.0 rows, 101.0 cpu, 0.0 io}, id = 2
> Step #1:
> Step #1: Sets:
> Step #1: Set#0, type: RecordType(VARCHAR wikimedia_project, BIGINT views)
> Step #1: rel#4:Subset#0.BEAM_LOGICAL.[], best=rel#2, importance=0.81
> Step #1: rel#2:BeamIOSourceRel.BEAM_LOGICAL.[](table=[beam, PCOLLECTION]), rowcount=100.0, cumulative cost={100.0 rows, 101.0 cpu, 0.0 io}
> Step #1: rel#10:Subset#0.ENUMERABLE.[], best=rel#9, importance=0.405
> Step #1: rel#9:BeamEnumerableConverter.ENUMERABLE.[](input=rel#4:Subset#0.BEAM_LOGICAL.[]), rowcount=100.0, cumulative cost={1.7976931348623157E308 rows, 1.7976931348623157E308 cpu, 1.7976931348623157E308 io}
> Step #1: Set#1, type: RecordType(VARCHAR wikimedia_project, BIGINT EXPR$1)
> Step #1: rel#6:Subset#1.NONE.[], best=null, importance=0.9
> Step #1: rel#5:LogicalAggregate.NONE.[](input=rel#4:Subset#0.BEAM_LOGICAL.[],group={0},EXPR$1=SUM($1)), rowcount=10.0, cumulative cost={inf}
> Step #1: rel#7:Subset#1.BEAM_LOGICAL.[], best=null, importance=1.0
> Step #1: rel#8:AbstractConverter.BEAM_LOGICAL.[](input=rel#6:Subset#1.NONE.[],convention=BEAM_LOGICAL,sort=[]), rowcount=10.0, cumulative cost={inf}
> Step #1:
> Step #1:
> Step #1: at org.apache.beam.repackaged.beam_sdks_java_extensions_sql.org.apache.calcite.plan.volcano.RelSubset$CheapestPlanReplacer.visit(RelSubset.java:448)
> Step #1: at org.apache.beam.repackaged.beam_sdks_java_extensions_sql.org.apache.calcite.plan.volcano.RelSubset.buildCheapestPlan(RelSubset.java:298)
> Step #1: at org.apache.beam.repackaged.beam_sdks_java_extensions_sql.org.apache.calcite.plan.volcano.VolcanoPlanner.findBestExp(VolcanoPlanner.java:666)
> Step #1: at org.apache.beam.repackaged.beam_sdks_java_extensions_sql.org.apache.calcite.tools.Programs$RuleSetProgram.run(Programs.java:368)
> Step #1: at org.apache.beam.repackaged.beam_sdks_java_extensions_sql.org.apache.calcite.prepare.PlannerImpl.transform(PlannerImpl.java:336)
> Step #1: at org.apache.beam.sdk.extensions.sql.impl.BeamQueryPlanner.convertToBeamRel(BeamQueryPlanner.java:138)
> Step #1: at org.apache.beam.sdk.extensions.sql.impl.BeamSqlEnv.parseQuery(BeamSqlEnv.java:105)
> Step #1: at org.apache.beam.sdk.extensions.sql.SqlTransform.expand(SqlTransform.java:96)
> Step #1: at org.apache.beam.sdk.extensions.sql.SqlTransform.expand(SqlTransform.java:79)
> Step #1: at org.apache.beam.sdk.Pipeline.applyInternal(Pipeline.java:537)
> Step #1: at org.apache.beam.sdk.Pipeline.applyTransform(Pipeline.java:488)
> Step #1: at org.apache.beam.sdk.values.PCollection.apply(PCollection.java:338)
> Step #1: at org.polleyg.TemplatePipeline.main(TemplatePipeline.java:59)
> Step #1: :run FAILED
> Step #1:
> Step #1: FAILURE: Build failed with an exception.
> {code}
> I'm using Beam 2.6.0
> Am I missing something obvious?
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