Hanumath Rao Maduri created CALCITE-2813: --------------------------------------------
Summary: Semijoins are not being considered in LoptOptimizeJoinRule for ordering the joins Key: CALCITE-2813 URL: https://issues.apache.org/jira/browse/CALCITE-2813 Project: Calcite Issue Type: Bug Components: core Affects Versions: 1.17.0 Reporter: Hanumath Rao Maduri Assignee: Julian Hyde During the debugging a performance issue in Apache Drill, I have noticed that the semi joins are not being considered in LoptOptimizeJoinRule. Due to this sub-optimal join ordering is resulting for some of the Drill queries. Here is an example for the same. : jdbc:drill:zk=local> alter session set `planner.enable_semijoin` = true; +-------+-----------------------------------+ | ok | summary | +-------+-----------------------------------+ | true | planner.enable_semijoin updated. | +-------+-----------------------------------+ 1 row selected (0.073 seconds) 0: jdbc:drill:zk=local> explain plan without implementation for select * from dfs.`/home/mapr/data/sf1/parquet/web_sales` ws1, dfs.`/home/mapr/data/sf1/parquet/web_sales` ws2 where ws1.ws_ship_date_sk in (select dd.d_date_sk from dfs.`/home/mapr/data/sf1/parquet/date_dim` dd) and ws1.ws_order_number = ws2.ws_order_number; +----------------------------------------------------------------------------------+----------------------------------------------------------------------------------+ | text | json | +----------------------------------------------------------------------------------+----------------------------------------------------------------------------------+ | DrillScreenRel DrillProjectRel(**=[$0], **0=[$3]) DrillSemiJoinRel(condition=[=($1, $6)], joinType=[inner]) DrillJoinRel(condition=[=($2, $5)], joinType=[inner]) DrillScanRel(table=[[dfs, /home/mapr/data/sf1/parquet/web_sales]], groupscan=[ParquetGroupScan [entries=[ReadEntryWithPath [path=file:/home/mapr/data/sf1/parquet/web_sales]], selectionRoot=file:/home/mapr/data/sf1/parquet/web_sales, numFiles=1, numRowGroups=1, usedMetadataFile=false, columns=[`**`, `ws_ship_date_sk`, `ws_order_number`]]]) DrillScanRel(table=[[dfs, /home/mapr/data/sf1/parquet/web_sales]], groupscan=[ParquetGroupScan [entries=[ReadEntryWithPath [path=file:/home/mapr/data/sf1/parquet/web_sales]], selectionRoot=file:/home/mapr/data/sf1/parquet/web_sales, numFiles=1, numRowGroups=1, usedMetadataFile=false, columns=[`**`, `ws_ship_date_sk`, `ws_order_number`]]]) DrillScanRel(table=[[dfs, /home/mapr/data/sf1/parquet/date_dim]], groupscan=[ParquetGroupScan [entries=[ReadEntryWithPath [path=file:/home/mapr/data/sf1/parquet/date_dim]], selectionRoot=file:/home/mapr/data/sf1/parquet/date_dim, numFiles=1, numRowGroups=1, usedMetadataFile=false, columns=[`d_date_sk`]]]) 0: jdbc:drill:zk=local> alter session set `planner.enable_semijoin` = false; +-------+-----------------------------------+ | ok | summary | +-------+-----------------------------------+ | true | planner.enable_semijoin updated. | +-------+-----------------------------------+ 1 row selected (0.077 seconds) 0: jdbc:drill:zk=local> explain plan without implementation for select * from dfs.`/home/mapr/data/sf1/parquet/web_sales` ws1, dfs.`/home/mapr/data/sf1/parquet/web_sales` ws2 where ws1.ws_ship_date_sk in (select dd.d_date_sk from dfs.`/home/mapr/data/sf1/parquet/date_dim` dd) and ws1.ws_order_number = ws2.ws_order_number; +----------------------------------------------------------------------------------+----------------------------------------------------------------------------------+ | text | json | +----------------------------------------------------------------------------------+----------------------------------------------------------------------------------+ | DrillScreenRel DrillProjectRel(**=[$0], **0=[$3]) DrillProjectRel(**=[$0], ws_ship_date_sk=[$1], ws_order_number=[$2], **0=[$4], ws_ship_date_sk0=[$5], ws_order_number0=[$6], d_date_sk=[$3]) DrillJoinRel(condition=[=($2, $6)], joinType=[inner]) DrillJoinRel(condition=[=($1, $3)], joinType=[inner]) DrillScanRel(table=[[dfs, /home/mapr/data/sf1/parquet/web_sales]], groupscan=[ParquetGroupScan [entries=[ReadEntryWithPath [path=file:/home/mapr/data/sf1/parquet/web_sales]], selectionRoot=file:/home/mapr/data/sf1/parquet/web_sales, numFiles=1, numRowGroups=1, usedMetadataFile=false, columns=[`**`, `ws_ship_date_sk`, `ws_order_number`]]]) DrillAggregateRel(group=[\{0}]) DrillScanRel(table=[[dfs, /home/mapr/data/sf1/parquet/date_dim]], groupscan=[ParquetGroupScan [entries=[ReadEntryWithPath [path=file:/home/mapr/data/sf1/parquet/date_dim]], selectionRoot=file:/home/mapr/data/sf1/parquet/date_dim, numFiles=1, numRowGroups=1, usedMetadataFile=false, columns=[`d_date_sk`]]]) DrillScanRel(table=[[dfs, /home/mapr/data/sf1/parquet/web_sales]], groupscan=[ParquetGroupScan [entries=[ReadEntryWithPath [path=file:/home/mapr/data/sf1/parquet/web_sales]], selectionRoot=file:/home/mapr/data/sf1/parquet/web_sales, numFiles=1, numRowGroups=1, usedMetadataFile=false, columns=[`**`, `ws_ship_date_sk`, `ws_order_number`]]]) -- This message was sent by Atlassian JIRA (v7.6.3#76005)