Zoltan Haindrich created CALCITE-2688: -----------------------------------------
Summary: 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 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)