Everyone, I made a copy of the Jdbc plugin and made modifications to it by adding a few rules. None of the modification I made or the rules I wrote should have anything extra to do with handling the following SQL query
SELECT * FROM incorta.SALES.SALES SALES WHERE 1 = 2 LIMIT 1 I know the query is useless, but I need to to know how to fix the following error thrown while handling this query. This is the final query plan: DEBUG o.a.d.e.p.s.h.DefaultSqlHandler - HEP_BOTTOM_UP:Convert SUM to $SUM0 > (0ms): > DrillLimitRel(*fetch=[1]*): rowcount = 1.0, cumulative cost = {201.0 > rows, 205.0 cpu, 0.0 io, 0.0 network, 0.0 memory}, id = 2653 > DrillLimitRel(*offset=[0], fetch=[0]*): rowcount = 1.0, cumulative cost > = {200.0 rows, 201.0 cpu, 0.0 io, 0.0 network, 0.0 memory}, id = 2651 > GelbanaJdbcDrel: rowcount = 100.0, cumulative cost = {200.0 rows, > 201.0 cpu, 0.0 io, 0.0 network, 0.0 memory}, id = 2649 > JdbcTableScan(table=[[gelbana, SALES, SALES]]): rowcount = 100.0, > cumulative cost = {100.0 rows, 101.0 cpu, 0.0 io, 0.0 network, 0.0 memory}, > id = 2572 This is the throw error stacktrace [Error Id: 83ea094a-db24-4d6d-bf0d-271db26db933 on 640fb7ebbd1a:31010] at org.apache.drill.common.exceptions.UserException$Builder.build(UserException.java:543) ~[drill-common-1.9.0.jar:1.9.0] at org.apache.drill.exec.work.foreman.Foreman$ForemanResult.close(Foreman.java:825) [drill-java-exec-1.9.0.jar:1.9.0] at org.apache.drill.exec.work.foreman.Foreman.moveToState(Foreman.java:935) [drill-java-exec-1.9.0.jar:1.9.0] at org.apache.drill.exec.work.foreman.Foreman.run(Foreman.java:281) [drill-java-exec-1.9.0.jar:1.9.0] at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) [na:1.8.0_131] at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) [na:1.8.0_131] at java.lang.Thread.run(Thread.java:748) [na:1.8.0_131] Caused by: org.apache.drill.exec.work.foreman.ForemanException: Unexpected exception during fragment initialization: null ... 4 common frames omitted *Caused by: java.lang.NullPointerException: null* at org.apache.drill.exec.planner.sql.handlers.FindHardDistributionScans.visit(FindHardDistributionScans.java:55) ~[drill-java-exec-1.9.0.jar:1.9.0] at org.apache.calcite.rel.core.TableScan.accept(TableScan.java:166) ~[calcite-core-1.4.0-drill-r19.jar:1.4.0-drill-r19] at org.apache.calcite.rel.RelShuttleImpl.visitChild(RelShuttleImpl.java:53) ~[calcite-core-1.4.0-drill-r19.jar:1.4.0-drill-r19] at org.apache.calcite.rel.RelShuttleImpl.visitChildren(RelShuttleImpl.java:68) ~[calcite-core-1.4.0-drill-r19.jar:1.4.0-drill-r19] at org.apache.calcite.rel.RelShuttleImpl.visit(RelShuttleImpl.java:126) ~[calcite-core-1.4.0-drill-r19.jar:1.4.0-drill-r19] at org.apache.calcite.rel.AbstractRelNode.accept(AbstractRelNode.java:256) ~[calcite-core-1.4.0-drill-r19.jar:1.4.0-drill-r19] at org.apache.calcite.rel.RelShuttleImpl.visitChild(RelShuttleImpl.java:53) ~[calcite-core-1.4.0-drill-r19.jar:1.4.0-drill-r19] at org.apache.calcite.rel.RelShuttleImpl.visitChildren(RelShuttleImpl.java:68) ~[calcite-core-1.4.0-drill-r19.jar:1.4.0-drill-r19] at org.apache.calcite.rel.RelShuttleImpl.visit(RelShuttleImpl.java:126) ~[calcite-core-1.4.0-drill-r19.jar:1.4.0-drill-r19] at org.apache.calcite.rel.AbstractRelNode.accept(AbstractRelNode.java:256) ~[calcite-core-1.4.0-drill-r19.jar:1.4.0-drill-r19] at org.apache.calcite.rel.RelShuttleImpl.visitChild(RelShuttleImpl.java:53) ~[calcite-core-1.4.0-drill-r19.jar:1.4.0-drill-r19] at org.apache.calcite.rel.RelShuttleImpl.visitChildren(RelShuttleImpl.java:68) ~[calcite-core-1.4.0-drill-r19.jar:1.4.0-drill-r19] at org.apache.calcite.rel.RelShuttleImpl.visit(RelShuttleImpl.java:126) ~[calcite-core-1.4.0-drill-r19.jar:1.4.0-drill-r19] at org.apache.calcite.rel.AbstractRelNode.accept(AbstractRelNode.java:256) ~[calcite-core-1.4.0-drill-r19.jar:1.4.0-drill-r19] at org.apache.drill.exec.planner.sql.handlers.FindHardDistributionScans.canForceSingleMode(FindHardDistributionScans.java:45) ~[drill-java-exec-1.9.0.jar:1.9.0] at org.apache.drill.exec.planner.sql.handlers.DefaultSqlHandler.convertToDrel(DefaultSqlHandler.java:262) ~[drill-java-exec-1.9.0.jar:1.9.0] at org.apache.drill.exec.planner.sql.handlers.DefaultSqlHandler.convertToDrel(DefaultSqlHandler.java:290) ~[drill-java-exec-1.9.0.jar:1.9.0] at org.apache.drill.exec.planner.sql.handlers.DefaultSqlHandler.getPlan(DefaultSqlHandler.java:168) ~[drill-java-exec-1.9.0.jar:1.9.0] at org.apache.drill.exec.planner.sql.DrillSqlWorker.getPhysicalPlan(DrillSqlWorker.java:123) ~[drill-java-exec-1.9.0.jar:1.9.0] at org.apache.drill.exec.planner.sql.DrillSqlWorker.getPlan(DrillSqlWorker.java:97) ~[drill-java-exec-1.9.0.jar:1.9.0] at org.apache.drill.exec.work.foreman.Foreman.runSQL(Foreman.java:1008) [drill-java-exec-1.9.0.jar:1.9.0] at org.apache.drill.exec.work.foreman.Foreman.run(Foreman.java:264) [drill-java-exec-1.9.0.jar:1.9.0] ... 3 common frames omitted Whic is because this statement unwrap = > scan.getTable().unwrap(DrillTranslatableTable.class).getDrillTable(); In *FindHardDistributionScans.java:55* evaluates *scan.getTable().unwrap(DrillTranslatableTable.class)* to null Would someone please explain to me what is Drill trying to do and what did I do wrong ? *---------------------* *Muhammad Gelbana* http://www.linkedin.com/in/mgelbana