[CALCITE-3971] Support Calc in RelMdColumnOrigins

• Type: Wish
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 1.23.0
• Assignee: Unassigned
• Reporter: xzh_dz
• Created: 04/May/20 14:11
• Updated: 24/May/20 12:00
• Resolved: 05/May/20 22:37

Description

In my project, we often use `RelColumnOrigin` to find metadata information for columns.
When i try to get origin column , and i got exception as below, the exception can be reproduced.

final String sql = "select name,deptno from dept";
    final RelNode relNode = convertSql(sql);
    final HepProgram program = new HepProgramBuilder().
        addRuleInstance(ProjectToCalcRule.INSTANCE).build();
    final HepPlanner planner = new HepPlanner(program);
    planner.setRoot(relNode);
    final RelNode calc = planner.findBestExp();
    final RelMetadataQuery mq = calc.getCluster().getMetadataQuery();
    final RelColumnOrigin nameColumn = mq.getColumnOrigin(calc, 0);
    assertThat(nameColumn.getOriginColumnOrdinal(), is(1));

java.lang.NullPointerException
at org.apache.calcite.test.RelMetadataTest.testCalcColumnOriginsTable(RelMetadataTest.java:391)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.junit.platform.commons.util.ReflectionUtils.invokeMethod(ReflectionUtils.java:675)
at org.junit.jupiter.engine.execution.MethodInvocation.proceed(MethodInvocation.java:60)

Issue Links

• links to: https://github.com/apache/calcite/pull/1960