[jira] [Created] (CALCITE-5394) RelToSql converter fails when semi-join is under a join node

["Leonid Chistov (Jira)" <ji...@apache.org>]

Leonid Chistov created CALCITE-5394:
---------------------------------------

             Summary: RelToSql converter fails when semi-join is under a join node
                 Key: CALCITE-5394
                 URL: https://issues.apache.org/jira/browse/CALCITE-5394
             Project: Calcite
          Issue Type: Bug
    Affects Versions: 1.32.0
            Reporter: Leonid Chistov


The following test case would fail if added to RelToSqlConverterTest.java:
{code:java}
@Test void testSemiJoinUnderJoin() {
  final RelBuilder builder = relBuilder();
  final RelNode base = builder
      .scan("EMP")
      .scan("EMP")
      .join(
          JoinRelType.SEMI, builder.equals(
              builder.field(2, 0, "EMPNO"),
              builder.field(2, 1, "EMPNO")))
      .build();
  final RelNode root = builder
      .scan("DEPT")
      .push(base)
      .join(
          JoinRelType.INNER, builder.equals(
              builder.field(2, 1, "DEPTNO"),
              builder.field(2, 0, "DEPTNO")))
      .project(builder.field("DEPTNO"))
      .build();
  toSql(root);
} {code}
The exception is:

 
{code:java}
alias
java.lang.NullPointerException: alias
    at java.base/java.util.Objects.requireNonNull(Objects.java:233)
    at org.apache.calcite.rel.rel2sql.SqlImplementor.collectAliases(SqlImplementor.java:493)
    at org.apache.calcite.rel.rel2sql.SqlImplementor.collectAliases(SqlImplementor.java:491)
    at org.apache.calcite.rel.rel2sql.SqlImplementor.result(SqlImplementor.java:476)
    at org.apache.calcite.rel.rel2sql.RelToSqlConverter.visit(RelToSqlConverter.java:246) {code}
Cause of failure seems to be that `RelToSqlConverter::visitAntiOrSemiJoin` rewrites semi-join as select with no associated alias.

 



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