xzh_dz created CALCITE-3971:
-------------------------------
Summary: Support Calc in RelMdColumnOrigins
Key: CALCITE-3971
URL: https://issues.apache.org/jira/browse/CALCITE-3971
Project: Calcite
Issue Type: Wish
Reporter: xzh_dz
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.
{code:java}
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));
{code}
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)
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