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.arrow.adapter.jdbc.h2;
  
  import static org.apache.arrow.adapter.jdbc.JdbcToArrowTestHelper.getBinaryValues;
  import static org.apache.arrow.adapter.jdbc.JdbcToArrowTestHelper.getBooleanValues;
  import static org.apache.arrow.adapter.jdbc.JdbcToArrowTestHelper.getCharArray;
  import static org.apache.arrow.adapter.jdbc.JdbcToArrowTestHelper.getDecimalValues;
  import static org.apache.arrow.adapter.jdbc.JdbcToArrowTestHelper.getDoubleValues;
  import static org.apache.arrow.adapter.jdbc.JdbcToArrowTestHelper.getFloatValues;
  import static org.apache.arrow.adapter.jdbc.JdbcToArrowTestHelper.getIntValues;
  import static org.apache.arrow.adapter.jdbc.JdbcToArrowTestHelper.getListValues;
  import static org.apache.arrow.adapter.jdbc.JdbcToArrowTestHelper.getLongValues;
  import static org.junit.jupiter.api.Assertions.assertArrayEquals;
  import static org.junit.jupiter.api.Assertions.assertEquals;
  import static org.junit.jupiter.api.Assertions.assertFalse;
  import static org.junit.jupiter.api.Assertions.assertNotEquals;
  import static org.junit.jupiter.api.Assertions.assertNotNull;
  import static org.junit.jupiter.api.Assertions.assertNull;
  import static org.junit.jupiter.api.Assertions.assertTrue;
  
  import java.io.IOException;
  import java.math.BigDecimal;
  import java.sql.SQLException;
  import java.sql.Types;
  import java.util.ArrayList;
  import java.util.Arrays;
  import java.util.Calendar;
  import java.util.List;
  import org.apache.arrow.adapter.jdbc.ArrowVectorIterator;
  import org.apache.arrow.adapter.jdbc.JdbcToArrow;
  import org.apache.arrow.adapter.jdbc.JdbcToArrowConfig;
  import org.apache.arrow.adapter.jdbc.JdbcToArrowConfigBuilder;
  import org.apache.arrow.adapter.jdbc.JdbcToArrowTestHelper;
  import org.apache.arrow.adapter.jdbc.Table;
  import org.apache.arrow.memory.RootAllocator;
  import org.apache.arrow.vector.BigIntVector;
  import org.apache.arrow.vector.BitVector;
  import org.apache.arrow.vector.DateDayVector;
  import org.apache.arrow.vector.DecimalVector;
  import org.apache.arrow.vector.FieldVector;
  import org.apache.arrow.vector.Float4Vector;
  import org.apache.arrow.vector.Float8Vector;
  import org.apache.arrow.vector.IntVector;
  import org.apache.arrow.vector.SmallIntVector;
  import org.apache.arrow.vector.TimeMilliVector;
  import org.apache.arrow.vector.TimeStampMilliTZVector;
  import org.apache.arrow.vector.TimeStampMilliVector;
  import org.apache.arrow.vector.TimeStampVector;
  import org.apache.arrow.vector.TinyIntVector;
  import org.apache.arrow.vector.ValueVector;
  import org.apache.arrow.vector.VarBinaryVector;
  import org.apache.arrow.vector.VarCharVector;
  import org.apache.arrow.vector.VectorSchemaRoot;
  import org.apache.arrow.vector.complex.ListVector;
  import org.apache.arrow.vector.types.FloatingPointPrecision;
  import org.apache.arrow.vector.types.pojo.ArrowType;
  import org.junit.jupiter.params.ParameterizedTest;
  import org.junit.jupiter.params.provider.MethodSource;
  
  public class JdbcToArrowVectorIteratorTest extends JdbcToArrowTest {
  
    @ParameterizedTest
    @MethodSource("getTestData")
    @Override
    public void testJdbcToArrowValues(Table table)
        throws SQLException, IOException, ClassNotFoundException {
      this.initializeDatabase(table);
  
      JdbcToArrowConfig config =
          new JdbcToArrowConfigBuilder(new RootAllocator(Integer.MAX_VALUE), Calendar.getInstance())
              .setTargetBatchSize(3)
              .setArraySubTypeByColumnNameMap(ARRAY_SUB_TYPE_BY_COLUMN_NAME_MAP)
              .build();
  
      ArrowVectorIterator iterator =
          JdbcToArrow.sqlToArrowVectorIterator(
              conn.createStatement().executeQuery(table.getQuery()), config);
  
      validate(iterator);
    }
  
    @ParameterizedTest
    @MethodSource("getTestData")
    public void testVectorSchemaRootReuse(Table table, boolean reuseVectorSchemaRoot)
        throws SQLException, IOException, ClassNotFoundException {
      this.initializeDatabase(table);
  
      Integer[][] intValues = {
        {101, 102, 103},
        {104, null, null},
        {107, 108, 109},
        {110}
      };
      Integer[][][] listValues = {
        {{1, 2, 3}, {1, 2}, {1}},
        {{2, 3, 4}, {2, 3}, {2}},
        {{3, 4, 5}, {3, 4}, {3}},
        {{}}
      };
  
      JdbcToArrowConfig config =
          new JdbcToArrowConfigBuilder(new RootAllocator(Integer.MAX_VALUE), Calendar.getInstance())
              .setTargetBatchSize(3)
              .setReuseVectorSchemaRoot(reuseVectorSchemaRoot)
              .setArraySubTypeByColumnNameMap(ARRAY_SUB_TYPE_BY_COLUMN_NAME_MAP)
              .build();
  
      ArrowVectorIterator iterator =
          JdbcToArrow.sqlToArrowVectorIterator(
              conn.createStatement().executeQuery(table.getQuery()), config);
  
      int batchCount = 0;
      VectorSchemaRoot prev = null;
      VectorSchemaRoot cur = null;
      while (iterator.hasNext()) {
        cur = iterator.next();
        assertNotNull(cur);
  
        // verify the first column, with may contain nulls.
        List<IntVector> intVectors = new ArrayList<>();
        intVectors.add((IntVector) cur.getVector(0));
        assertIntVectorValues(intVectors, intValues[batchCount].length, intValues[batchCount]);
  
        // verify arrays are handled correctly
        List<ListVector> listVectors = new ArrayList<>();
        listVectors.add((ListVector) cur.getVector(18));
        assertListVectorValues(listVectors, listValues[batchCount].length, listValues[batchCount]);
  
        if (prev != null) {
          // skip the first iteration
  
          if (reuseVectorSchemaRoot) {
            // when reuse is enabled, different iterations are based on the same vector schema root.
            assertTrue(prev == cur);
          } else {
            // when reuse is enabled, a new vector schema root is created in each iteration.
            assertFalse(prev == cur);
            if (batchCount < 3) {
              cur.close();
            }
          }
        }
  
        prev = cur;
        batchCount += 1;
      }
  
      iterator.close();
      if (!reuseVectorSchemaRoot) {
        assertNotNull(cur);
        // test that closing the iterator does not close the vectors held by the consumers
        assertNotEquals(cur.getVector(0).getValueCount(), 0);
        cur.close();
      }
      // make sure we have at least two batches, so the above test paths are actually covered
      assertTrue(batchCount > 1);
    }
  
    @ParameterizedTest
    @MethodSource("getTestData")
    public void testJdbcToArrowValuesNoLimit(Table table)
        throws SQLException, IOException, ClassNotFoundException {
      this.initializeDatabase(table);
  
      JdbcToArrowConfig config =
          new JdbcToArrowConfigBuilder(new RootAllocator(Integer.MAX_VALUE), Calendar.getInstance())
              .setTargetBatchSize(JdbcToArrowConfig.NO_LIMIT_BATCH_SIZE)
              .setArraySubTypeByColumnNameMap(ARRAY_SUB_TYPE_BY_COLUMN_NAME_MAP)
              .build();
  
      ArrowVectorIterator iterator =
          JdbcToArrow.sqlToArrowVectorIterator(
              conn.createStatement().executeQuery(table.getQuery()), config);
  
      validate(iterator);
    }
  
    @ParameterizedTest
    @MethodSource("getTestData")
    public void testTimeStampConsumer(Table table, boolean reuseVectorSchemaRoot)
        throws SQLException, IOException, ClassNotFoundException {
      this.initializeDatabase(table);
  
      final String sql = "select timestamp_field11 from table1";
  
      // first experiment, with calendar and time zone.
      JdbcToArrowConfig config =
          new JdbcToArrowConfigBuilder(new RootAllocator(Integer.MAX_VALUE), Calendar.getInstance())
              .setTargetBatchSize(3)
              .setReuseVectorSchemaRoot(reuseVectorSchemaRoot)
              .setArraySubTypeByColumnNameMap(ARRAY_SUB_TYPE_BY_COLUMN_NAME_MAP)
              .build();
      assertNotNull(config.getCalendar());
  
      try (ArrowVectorIterator iterator =
          JdbcToArrow.sqlToArrowVectorIterator(conn.createStatement().executeQuery(sql), config)) {
        VectorSchemaRoot root = iterator.next();
        assertEquals(1, root.getFieldVectors().size());
  
        // vector with time zone info.
        assertTrue(root.getVector(0) instanceof TimeStampMilliTZVector);
      }
  
      // second experiment, without calendar and time zone.
      config =
          new JdbcToArrowConfigBuilder(new RootAllocator(Integer.MAX_VALUE), null)
              .setTargetBatchSize(3)
              .setReuseVectorSchemaRoot(reuseVectorSchemaRoot)
              .setArraySubTypeByColumnNameMap(ARRAY_SUB_TYPE_BY_COLUMN_NAME_MAP)
              .build();
      assertNull(config.getCalendar());
  
      try (ArrowVectorIterator iterator =
          JdbcToArrow.sqlToArrowVectorIterator(conn.createStatement().executeQuery(sql), config)) {
        VectorSchemaRoot root = iterator.next();
        assertEquals(1, root.getFieldVectors().size());
  
        // vector without time zone info.
        assertTrue(root.getVector(0) instanceof TimeStampMilliVector);
      }
    }
  
    private void validate(ArrowVectorIterator iterator) throws SQLException, IOException {
  
      List<BigIntVector> bigIntVectors = new ArrayList<>();
      List<TinyIntVector> tinyIntVectors = new ArrayList<>();
      List<IntVector> intVectors = new ArrayList<>();
      List<SmallIntVector> smallIntVectors = new ArrayList<>();
      List<VarBinaryVector> vectorsForBinary = new ArrayList<>();
      List<VarBinaryVector> vectorsForBlob = new ArrayList<>();
      List<VarCharVector> vectorsForClob = new ArrayList<>();
      List<VarCharVector> vectorsForVarChar = new ArrayList<>();
      List<VarCharVector> vectorsForChar = new ArrayList<>();
      List<BitVector> vectorsForBit = new ArrayList<>();
      List<BitVector> vectorsForBool = new ArrayList<>();
      List<DateDayVector> dateDayVectors = new ArrayList<>();
      List<TimeMilliVector> timeMilliVectors = new ArrayList<>();
      List<TimeStampVector> timeStampVectors = new ArrayList<>();
      List<DecimalVector> decimalVectors = new ArrayList<>();
      List<Float4Vector> float4Vectors = new ArrayList<>();
      List<Float8Vector> float8Vectors = new ArrayList<>();
      List<ListVector> listVectors = new ArrayList<>();
  
      List<VectorSchemaRoot> roots = new ArrayList<>();
      while (iterator.hasNext()) {
        VectorSchemaRoot root = iterator.next();
        roots.add(root);
  
        JdbcToArrowTestHelper.assertFieldMetadataIsEmpty(root);
  
        bigIntVectors.add((BigIntVector) root.getVector(BIGINT));
        tinyIntVectors.add((TinyIntVector) root.getVector(TINYINT));
        intVectors.add((IntVector) root.getVector(INT));
        smallIntVectors.add((SmallIntVector) root.getVector(SMALLINT));
        vectorsForBinary.add((VarBinaryVector) root.getVector(BINARY));
        vectorsForBlob.add((VarBinaryVector) root.getVector(BLOB));
        vectorsForClob.add((VarCharVector) root.getVector(CLOB));
        vectorsForVarChar.add((VarCharVector) root.getVector(VARCHAR));
        vectorsForChar.add((VarCharVector) root.getVector(CHAR));
        vectorsForBit.add((BitVector) root.getVector(BIT));
        vectorsForBool.add((BitVector) root.getVector(BOOL));
        dateDayVectors.add((DateDayVector) root.getVector(DATE));
        timeMilliVectors.add((TimeMilliVector) root.getVector(TIME));
        timeStampVectors.add((TimeStampVector) root.getVector(TIMESTAMP));
        decimalVectors.add((DecimalVector) root.getVector(DECIMAL));
        float4Vectors.add((Float4Vector) root.getVector(REAL));
        float8Vectors.add((Float8Vector) root.getVector(DOUBLE));
        listVectors.add((ListVector) root.getVector(LIST));
      }
      assertBigIntVectorValues(
          bigIntVectors, table.getRowCount(), getLongValues(table.getValues(), BIGINT));
      assertTinyIntVectorValues(
          tinyIntVectors, table.getRowCount(), getIntValues(table.getValues(), TINYINT));
      assertIntVectorValues(intVectors, table.getRowCount(), getIntValues(table.getValues(), INT));
      assertSmallIntVectorValues(
          smallIntVectors, table.getRowCount(), getIntValues(table.getValues(), SMALLINT));
      assertBinaryVectorValues(
          vectorsForBinary, table.getRowCount(), getBinaryValues(table.getValues(), BINARY));
      assertBinaryVectorValues(
          vectorsForBlob, table.getRowCount(), getBinaryValues(table.getValues(), BLOB));
      assertVarCharVectorValues(
          vectorsForClob, table.getRowCount(), getCharArray(table.getValues(), CLOB));
      assertVarCharVectorValues(
          vectorsForVarChar, table.getRowCount(), getCharArray(table.getValues(), VARCHAR));
      assertVarCharVectorValues(
          vectorsForChar, table.getRowCount(), getCharArray(table.getValues(), CHAR));
      assertBitVectorValues(vectorsForBit, table.getRowCount(), getIntValues(table.getValues(), BIT));
      assertBooleanVectorValues(
          vectorsForBool, table.getRowCount(), getBooleanValues(table.getValues(), BOOL));
      assertDateDayVectorValues(
          dateDayVectors, table.getRowCount(), getLongValues(table.getValues(), DATE));
      assertTimeMilliVectorValues(
          timeMilliVectors, table.getRowCount(), getLongValues(table.getValues(), TIME));
      assertTimeStampVectorValues(
          timeStampVectors, table.getRowCount(), getLongValues(table.getValues(), TIMESTAMP));
      assertDecimalVectorValues(
          decimalVectors, table.getRowCount(), getDecimalValues(table.getValues(), DECIMAL));
      assertFloat4VectorValues(
          float4Vectors, table.getRowCount(), getFloatValues(table.getValues(), REAL));
      assertFloat8VectorValues(
          float8Vectors, table.getRowCount(), getDoubleValues(table.getValues(), DOUBLE));
      assertListVectorValues(
          listVectors, table.getRowCount(), getListValues(table.getValues(), LIST));
  
      roots.forEach(root -> root.close());
    }
  
    private void assertFloat8VectorValues(List<Float8Vector> vectors, int rowCount, Double[] values) {
      int valueCount = vectors.stream().mapToInt(ValueVector::getValueCount).sum();
      assertEquals(rowCount, valueCount);
  
      int index = 0;
      for (Float8Vector vector : vectors) {
        for (int i = 0; i < vector.getValueCount(); i++) {
          assertEquals(values[index++].doubleValue(), vector.get(i), 0.01);
        }
      }
    }
  
    private void assertFloat4VectorValues(List<Float4Vector> vectors, int rowCount, Float[] values) {
      int valueCount = vectors.stream().mapToInt(ValueVector::getValueCount).sum();
      assertEquals(rowCount, valueCount);
  
      int index = 0;
      for (Float4Vector vector : vectors) {
        for (int i = 0; i < vector.getValueCount(); i++) {
          assertEquals(values[index++].floatValue(), vector.get(i), 0.01);
        }
      }
    }
  
    private void assertDecimalVectorValues(
        List<DecimalVector> vectors, int rowCount, BigDecimal[] values) {
      int valueCount = vectors.stream().mapToInt(ValueVector::getValueCount).sum();
      assertEquals(rowCount, valueCount);
  
      int index = 0;
      for (DecimalVector vector : vectors) {
        for (int i = 0; i < vector.getValueCount(); i++) {
          assertNotNull(vector.getObject(i));
          assertEquals(values[index++].doubleValue(), vector.getObject(i).doubleValue(), 0);
        }
      }
    }
  
    private void assertTimeStampVectorValues(
        List<TimeStampVector> vectors, int rowCount, Long[] values) {
      int valueCount = vectors.stream().mapToInt(ValueVector::getValueCount).sum();
      assertEquals(rowCount, valueCount);
  
      int index = 0;
      for (TimeStampVector vector : vectors) {
        for (int i = 0; i < vector.getValueCount(); i++) {
          assertEquals(values[index++].longValue(), vector.get(i));
        }
      }
    }
  
    private void assertTimeMilliVectorValues(
        List<TimeMilliVector> vectors, int rowCount, Long[] values) {
      int valueCount = vectors.stream().mapToInt(ValueVector::getValueCount).sum();
      assertEquals(rowCount, valueCount);
  
      int index = 0;
      for (TimeMilliVector vector : vectors) {
        for (int i = 0; i < vector.getValueCount(); i++) {
          assertEquals(values[index++].longValue(), vector.get(i));
        }
      }
    }
  
    private void assertDateDayVectorValues(List<DateDayVector> vectors, int rowCount, Long[] values) {
      int valueCount = vectors.stream().mapToInt(ValueVector::getValueCount).sum();
      assertEquals(rowCount, valueCount);
  
      int index = 0;
      for (DateDayVector vector : vectors) {
        for (int i = 0; i < vector.getValueCount(); i++) {
          assertEquals(values[index++].longValue(), vector.get(i));
        }
      }
    }
  
    private void assertBitVectorValues(List<BitVector> vectors, int rowCount, Integer[] values) {
      int valueCount = vectors.stream().mapToInt(ValueVector::getValueCount).sum();
      assertEquals(rowCount, valueCount);
  
      int index = 0;
      for (BitVector vector : vectors) {
        for (int i = 0; i < vector.getValueCount(); i++) {
          assertEquals(values[index++].intValue(), vector.get(i));
        }
      }
    }
  
    private void assertBooleanVectorValues(List<BitVector> vectors, int rowCount, Boolean[] values) {
      int valueCount = vectors.stream().mapToInt(ValueVector::getValueCount).sum();
      assertEquals(rowCount, valueCount);
  
      int index = 0;
      for (BitVector vector : vectors) {
        for (int i = 0; i < vector.getValueCount(); i++) {
          assertEquals(values[index++], vector.get(i) == 1);
        }
      }
    }
  
    private void assertVarCharVectorValues(
        List<VarCharVector> vectors, int rowCount, byte[][] values) {
      int valueCount = vectors.stream().mapToInt(ValueVector::getValueCount).sum();
      assertEquals(rowCount, valueCount);
  
      int index = 0;
      for (VarCharVector vector : vectors) {
        for (int i = 0; i < vector.getValueCount(); i++) {
          assertArrayEquals(values[index++], vector.get(i));
        }
      }
    }
  
    private void assertBinaryVectorValues(
        List<VarBinaryVector> vectors, int rowCount, byte[][] values) {
      int valueCount = vectors.stream().mapToInt(ValueVector::getValueCount).sum();
      assertEquals(rowCount, valueCount);
  
      int index = 0;
      for (VarBinaryVector vector : vectors) {
        for (int i = 0; i < vector.getValueCount(); i++) {
          assertArrayEquals(values[index++], vector.get(i));
        }
      }
    }
  
    private void assertSmallIntVectorValues(
        List<SmallIntVector> vectors, int rowCount, Integer[] values) {
      int valueCount = vectors.stream().mapToInt(ValueVector::getValueCount).sum();
      assertEquals(rowCount, valueCount);
  
      int index = 0;
      for (SmallIntVector vector : vectors) {
        for (int i = 0; i < vector.getValueCount(); i++) {
          assertEquals(values[index++].intValue(), vector.get(i));
        }
      }
    }
  
    private void assertTinyIntVectorValues(
        List<TinyIntVector> vectors, int rowCount, Integer[] values) {
      int valueCount = vectors.stream().mapToInt(ValueVector::getValueCount).sum();
      assertEquals(rowCount, valueCount);
  
      int index = 0;
      for (TinyIntVector vector : vectors) {
        for (int i = 0; i < vector.getValueCount(); i++) {
          assertEquals(values[index++].intValue(), vector.get(i));
        }
      }
    }
  
    private void assertBigIntVectorValues(List<BigIntVector> vectors, int rowCount, Long[] values) {
      int valueCount = vectors.stream().mapToInt(ValueVector::getValueCount).sum();
      assertEquals(rowCount, valueCount);
  
      int index = 0;
      for (BigIntVector vector : vectors) {
        for (int i = 0; i < vector.getValueCount(); i++) {
          assertEquals(values[index++].longValue(), vector.get(i));
        }
      }
    }
  
    private void assertIntVectorValues(List<IntVector> vectors, int rowCount, Integer[] values) {
      int valueCount = vectors.stream().mapToInt(ValueVector::getValueCount).sum();
      assertEquals(rowCount, valueCount);
  
      int index = 0;
      for (IntVector vector : vectors) {
        for (int i = 0; i < vector.getValueCount(); i++) {
          if (values[index] == null) {
            assertTrue(vector.isNull(i));
          } else {
            assertEquals(values[index].longValue(), vector.get(i));
          }
          index++;
        }
      }
    }
  
    public static void assertListVectorValues(
        List<ListVector> vectors, int rowCount, Integer[][] values) {
      int valueCount = vectors.stream().mapToInt(ValueVector::getValueCount).sum();
      assertEquals(rowCount, valueCount);
  
      int index = 0;
      for (ListVector vector : vectors) {
        for (int i = 0; i < vector.getValueCount(); i++) {
          if (values[index] == null) {
            assertTrue(vector.isNull(i));
          } else {
            List<Integer> list = (List<Integer>) vector.getObject(i);
            assertEquals(Arrays.asList(values[index]), list);
          }
          index++;
        }
      }
    }
  
    /** Runs a simple query, and encapsulates the result into a field vector. */
    private FieldVector getQueryResult(JdbcToArrowConfig config) throws SQLException, IOException {
      ArrowVectorIterator iterator =
          JdbcToArrow.sqlToArrowVectorIterator(
              conn.createStatement().executeQuery("select real_field8 from table1"), config);
  
      VectorSchemaRoot root = iterator.next();
  
      // only one vector, since there is one column in the select statement.
      assertEquals(1, root.getFieldVectors().size());
      FieldVector result = root.getVector(0);
  
      // make sure some data is actually read
      assertTrue(result.getValueCount() > 0);
  
      return result;
    }
  
    @ParameterizedTest
    @MethodSource("getTestData")
    public void testJdbcToArrowCustomTypeConversion(Table table, boolean reuseVectorSchemaRoot)
        throws SQLException, IOException, ClassNotFoundException {
      this.initializeDatabase(table);
  
      JdbcToArrowConfigBuilder builder =
          new JdbcToArrowConfigBuilder(new RootAllocator(Integer.MAX_VALUE), Calendar.getInstance())
              .setTargetBatchSize(JdbcToArrowConfig.NO_LIMIT_BATCH_SIZE)
              .setReuseVectorSchemaRoot(reuseVectorSchemaRoot)
              .setArraySubTypeByColumnNameMap(ARRAY_SUB_TYPE_BY_COLUMN_NAME_MAP);
  
      // first experiment, using default type converter
      JdbcToArrowConfig config = builder.build();
  
      try (FieldVector vector = getQueryResult(config)) {
        // the default converter translates real to float4
        assertTrue(vector instanceof Float4Vector);
      }
  
      // second experiment, using customized type converter
      builder.setJdbcToArrowTypeConverter(
          (fieldInfo) -> {
            switch (fieldInfo.getJdbcType()) {
              case Types.REAL:
                // this is different from the default type converter
                return new ArrowType.FloatingPoint(FloatingPointPrecision.DOUBLE);
              default:
                return null;
            }
          });
      config = builder.build();
  
      try (FieldVector vector = getQueryResult(config)) {
        // the customized converter translates real to float8
        assertTrue(vector instanceof Float8Vector);
      }
    }
  }
  