content: /*
   * Licensed to the Apache Software Foundation (ASF) under one or more
   * contributor license agreements.  See the NOTICE file distributed with
   * this work for additional information regarding copyright ownership.
   * The ASF licenses this file to you under the Apache License, Version 2.0
   * (the "License"); you may not use this file except in compliance with
   * the License.  You may obtain a copy of the License at
   *
   * http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  package org.apache.calcite.adapter.enumerable;
  
  import org.apache.calcite.adapter.java.JavaTypeFactory;
  import org.apache.calcite.jdbc.JavaTypeFactoryImpl;
  import org.apache.calcite.linq4j.Enumerable;
  import org.apache.calcite.linq4j.tree.Expression;
  import org.apache.calcite.linq4j.tree.Expressions;
  import org.apache.calcite.rel.type.RelDataType;
  import org.apache.calcite.sql.type.SqlTypeName;
  
  import com.google.common.collect.ImmutableList;
  
  import org.junit.jupiter.api.Test;
  
  import static org.hamcrest.CoreMatchers.is;
  import static org.hamcrest.MatcherAssert.assertThat;
  
  /**
   * Test for {@link org.apache.calcite.adapter.enumerable.PhysTypeImpl}.
   */
  public final class PhysTypeTest {
    private static final JavaTypeFactory TYPE_FACTORY = new JavaTypeFactoryImpl();
  
    /** Test case for
     * <a href="https://issues.apache.org/jira/browse/CALCITE-2677">[CALCITE-2677]
     * Struct types with one field are not mapped correctly to Java Classes</a>. */
    @Test void testFieldClassOnColumnOfOneFieldStructType() {
      RelDataType columnType =
          TYPE_FACTORY.createStructType(
              ImmutableList.of(TYPE_FACTORY.createSqlType(SqlTypeName.INTEGER)),
              ImmutableList.of("intField"));
      RelDataType rowType =
          TYPE_FACTORY.createStructType(ImmutableList.of(columnType),
              ImmutableList.of("structField"));
  
      PhysType rowPhysType =
          PhysTypeImpl.of(TYPE_FACTORY, rowType, JavaRowFormat.ARRAY);
      assertThat(rowPhysType.fieldClass(0), is(Object[].class));
    }
  
    /** Test case for
     * <a href="https://issues.apache.org/jira/browse/CALCITE-2677">[CALCITE-2677]
     * Struct types with one field are not mapped correctly to Java Classes</a>. */
    @Test void testFieldClassOnColumnOfTwoFieldStructType() {
      RelDataType columnType =
          TYPE_FACTORY.createStructType(
              ImmutableList.of(TYPE_FACTORY.createSqlType(SqlTypeName.INTEGER),
                  TYPE_FACTORY.createSqlType(SqlTypeName.VARCHAR)),
              ImmutableList.of("intField", "strField"));
      RelDataType rowType =
          TYPE_FACTORY.createStructType(ImmutableList.of(columnType),
              ImmutableList.of("structField"));
  
      PhysType rowPhysType =
          PhysTypeImpl.of(TYPE_FACTORY, rowType, JavaRowFormat.ARRAY);
      assertThat(rowPhysType.fieldClass(0), is(Object[].class));
    }
  
    /** Test case for
     * <a href="https://issues.apache.org/jira/browse/CALCITE-3364">[CALCITE-3364]
     * Can't group table function result due to a type cast error if table function
     * returns a row with a single value</a>. */
    @Test void testOneColumnJavaRowFormatConversion() {
      RelDataType rowType =
          TYPE_FACTORY.createStructType(
              ImmutableList.of(TYPE_FACTORY.createSqlType(SqlTypeName.INTEGER)),
              ImmutableList.of("intField"));
      final PhysType rowPhysType =
          PhysTypeImpl.of(TYPE_FACTORY, rowType, JavaRowFormat.ARRAY, false);
      final Expression e =
          rowPhysType.convertTo(Expressions.parameter(Enumerable.class, "input"),
              JavaRowFormat.SCALAR);
      final String expected = "input.select(new org.apache.calcite.linq4j.function.Function1() {\n"
          + "  public int apply(Object[] o) {\n"
          + "    return org.apache.calcite.runtime.SqlFunctions.toInt(o[0]);\n"
          + "  }\n"
          + "  public Object apply(Object o) {\n"
          + "    return apply(\n"
          + "      (Object[]) o);\n"
          + "  }\n"
          + "}\n"
          + ")";
      assertThat(expected, is(Expressions.toString(e)));
    }
  }
  