[ https://issues.apache.org/jira/browse/CALCITE-2688?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16708028#comment-16708028 ]
Julian Hyde commented on CALCITE-2688: -------------------------------------- Fixed in [e274f1ba|http://git-wip-us.apache.org/repos/asf/calcite/commit/e274f1ba]; thanks for the PR, [~kgyrtkirk]! > Improve diagnosability when return type could not be inferred. > -------------------------------------------------------------- > > Key: CALCITE-2688 > URL: https://issues.apache.org/jira/browse/CALCITE-2688 > Project: Calcite > Issue Type: Improvement > Reporter: Zoltan Haindrich > Assignee: Zoltan Haindrich > Priority: Major > Fix For: 1.18.0 > > > Currently when the return type inferenence fails; a {{null}} is returned; > while leads to an NPE very quickly - the resulting Exception is not > informative at all. > {code} > @Test(expected = IllegalArgumentException.class) > public void checkNoCommonReturnTypeException() { > coalesce(vVarchar(1), vInt(2)); > } > {code} > example NPE: > {code} > java.lang.NullPointerException > at java.util.Objects.requireNonNull(Objects.java:203) > at org.apache.calcite.rex.RexCall.<init>(RexCall.java:59) > at org.apache.calcite.rex.RexBuilder.makeCall(RexBuilder.java:242) > at org.apache.calcite.rex.RexBuilder.makeCall(RexBuilder.java:254) > at > org.apache.calcite.test.RexProgramBuilderBase.coalesce(RexProgramBuilderBase.java:300) > at > org.apache.calcite.test.RexProgramTest.checkNoCommonReturnTypeException(RexProgramTest.java:753) > at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) > {code} -- This message was sent by Atlassian JIRA (v7.6.3#76005)