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Posted to issues@calcite.apache.org by "Ruben Q L (Jira)" <ji...@apache.org> on 2020/11/19 15:45:00 UTC
[jira] [Created] (CALCITE-4409) Improve exception when RelBuilder
tries to create a field on a non-struct expression
Ruben Q L created CALCITE-4409:
----------------------------------
Summary: Improve exception when RelBuilder tries to create a field on a non-struct expression
Key: CALCITE-4409
URL: https://issues.apache.org/jira/browse/CALCITE-4409
Project: Calcite
Issue Type: Task
Components: core
Reporter: Ruben Q L
Fix For: 1.27.0
A simple test like this (to added in RelBuilderTest), where {{RelBuilder#field(RexNode e, String name)}} is called and the first parameter's type is not a struct:
{code}
@Test void test() {
final RelBuilder builder = RelBuilder.create(config().build());
builder.scan("EMP")
.project(
builder.field(builder.field("EMPNO"), "abc"))
.build();
}
{code}
Fails with a NPE:
{noformat}
java.lang.NullPointerException
at org.apache.calcite.rel.type.RelDataTypeImpl.getField(RelDataTypeImpl.java:82)
at org.apache.calcite.rex.RexBuilder.makeFieldAccess(RexBuilder.java:182)
at org.apache.calcite.tools.RelBuilder.field(RelBuilder.java:502)
{noformat}
This situation could be handled with a more gracefully exit and a more useful exception message.
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