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final RelBuilder builder = RelBuilder.create(config().build());
    RelNode root =
        builder.scan("EMP")
            .as("e")
            .scan("EMP")
            .as("m")
            .scan("DEPT")
            .join(JoinRelType.INNER)
            .join(JoinRelType.INNER)
            .filter(
                builder.equals(builder.field("e", "DEPTNO"),
                    builder.field("DEPT", "DEPTNO")),
                builder.equals(builder.field("m", "EMPNO"),
                    builder.field("e", "MGR")))
            .build();
    final String expected = ""
        + "LogicalFilter(condition=[AND(=($7, $16), =($8, $3))])\n"
        + "  LogicalJoin(condition=[true], joinType=[inner])\n"
        + "    LogicalTableScan(table=[[scott, EMP]])\n"
        + "    LogicalJoin(condition=[true], joinType=[inner])\n"
        + "      LogicalTableScan(table=[[scott, EMP]])\n"
        + "      LogicalTableScan(table=[[scott, DEPT]])\n";
    assertThat(str(root), is(expected));

上記のコードは RelBuilderTest.java からのものです。 なぜ方解石はLogicalJoin(condition=[true], joinType=[inner])ノードを生成するのですか? RelToSqlConverterRelNode を SQL に変換するために使用すると、filter 'condition=[true]'

ava.lang.AssertionError: Internal error: While invoking method 'public org.apache.calcite.rel.rel2sql.SqlImplementor$Result org.apache.calcite.rel.rel2sql.RelToSqlConverter.visit(org.apache.calcite.rel.core.Filter)
at org.apache.calcite.util.Util.newInternal(Util.java:792)
at org.apache.calcite.util.ReflectUtil$2.invoke(ReflectUtil.java:535)
at org.apache.calcite.rel.rel2sql.RelToSqlConverter.dispatch(RelToSqlConverter.java:80

なぜこれが起こるのですか？

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