vector/src/main/codegen/templates/UnionViewWriter.java [54:193]:
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
  <#list vv.types as type>
    <#list type.minor as minor>
      <#assign name = minor.class?cap_first />
      <#assign fields = minor.fields!type.fields />
      <#assign uncappedName = name?uncap_first/>
      <#assign friendlyType = (minor.friendlyType!minor.boxedType!type.boxedType) />
      <#if !minor.typeParams?? || minor.class?starts_with("Decimal") || is_timestamp_tz(minor.class) || minor.class == "Duration" || minor.class == "FixedSizeBinary">

  private ${name}Writer ${name?uncap_first}Writer;

  <#if minor.class?starts_with("Decimal") || is_timestamp_tz(minor.class) || minor.class == "Duration" || minor.class == "FixedSizeBinary">
  private ${name}Writer get${name}Writer(ArrowType arrowType) {
    if (${uncappedName}Writer == null) {
      ${uncappedName}Writer = new ${name}WriterImpl(data.get${name}Vector(arrowType));
      ${uncappedName}Writer.setPosition(idx());
      writers.add(${uncappedName}Writer);
    }
    return ${uncappedName}Writer;
  }

  public ${name}Writer as${name}(ArrowType arrowType) {
    data.setType(idx(), MinorType.${name?upper_case});
    return get${name}Writer(arrowType);
  }
  <#else>
  private ${name}Writer get${name}Writer() {
    if (${uncappedName}Writer == null) {
      ${uncappedName}Writer = new ${name}WriterImpl(data.get${name}Vector());
      ${uncappedName}Writer.setPosition(idx());
      writers.add(${uncappedName}Writer);
    }
    return ${uncappedName}Writer;
  }

  public ${name}Writer as${name}() {
    data.setType(idx(), MinorType.${name?upper_case});
    return get${name}Writer();
  }
  </#if>

  @Override
  public void write(${name}Holder holder) {
    data.setType(idx(), MinorType.${name?upper_case});
    <#if minor.class?starts_with("Decimal")>
        ArrowType arrowType = new ArrowType.Decimal(holder.precision, holder.scale, ${name}Holder.WIDTH * 8);
    get${name}Writer(arrowType).setPosition(idx());
    get${name}Writer(arrowType).write${name}(<#list fields as field>holder.${field.name}<#if field_has_next>, </#if></#list>, arrowType);
    <#elseif is_timestamp_tz(minor.class)>
        ArrowType.Timestamp arrowTypeWithoutTz = (ArrowType.Timestamp) MinorType.${name?upper_case?remove_ending("TZ")}.getType();
    ArrowType arrowType = new ArrowType.Timestamp(arrowTypeWithoutTz.getUnit(), holder.timezone);
    get${name}Writer(arrowType).setPosition(idx());
    get${name}Writer(arrowType).write(holder);
    <#elseif minor.class == "Duration">
        ArrowType arrowType = new ArrowType.Duration(holder.unit);
    get${name}Writer(arrowType).setPosition(idx());
    get${name}Writer(arrowType).write(holder);
    <#elseif minor.class == "FixedSizeBinary">
        ArrowType arrowType = new ArrowType.FixedSizeBinary(holder.byteWidth);
    get${name}Writer(arrowType).setPosition(idx());
    get${name}Writer(arrowType).write(holder);
    <#else>
    get${name}Writer().setPosition(idx());
    get${name}Writer().write${name}(<#list fields as field>holder.${field.name}<#if field_has_next>, </#if></#list>);
    </#if>
  }

  public void write${minor.class}(<#list fields as field>${field.type} ${field.name}<#if field_has_next>, </#if></#list><#if minor.class?starts_with("Decimal")>, ArrowType arrowType</#if>) {
    data.setType(idx(), MinorType.${name?upper_case});
    <#if minor.class?starts_with("Decimal")>
        get${name}Writer(arrowType).setPosition(idx());
    get${name}Writer(arrowType).write${name}(<#list fields as field>${field.name}<#if field_has_next>, </#if></#list>, arrowType);
    <#elseif is_timestamp_tz(minor.class)>
        ArrowType.Timestamp arrowTypeWithoutTz = (ArrowType.Timestamp) MinorType.${name?upper_case?remove_ending("TZ")}.getType();
    ArrowType arrowType = new ArrowType.Timestamp(arrowTypeWithoutTz.getUnit(), "UTC");
    get${name}Writer(arrowType).setPosition(idx());
    get${name}Writer(arrowType).write${name}(<#list fields as field>${field.name}<#if field_has_next>, </#if></#list>);
    <#elseif minor.class == "Duration" || minor.class == "FixedSizeBinary">
        // This is expected to throw. There's nothing more that we can do here since we can't infer any
        // sort of default unit for the Duration or a default width for the FixedSizeBinary types.
        ArrowType arrowType = MinorType.${name?upper_case}.getType();
    get${name}Writer(arrowType).setPosition(idx());
    get${name}Writer(arrowType).write${name}(<#list fields as field>${field.name}<#if field_has_next>, </#if></#list>);
    <#else>
    get${name}Writer().setPosition(idx());
    get${name}Writer().write${name}(<#list fields as field>${field.name}<#if field_has_next>, </#if></#list>);
    </#if>
  }
  <#if minor.class?starts_with("Decimal")>
  public void write${name}(${friendlyType} value) {
    data.setType(idx(), MinorType.${name?upper_case});
    ArrowType arrowType = new ArrowType.Decimal(value.precision(), value.scale(), ${name}Vector.TYPE_WIDTH * 8);
    get${name}Writer(arrowType).setPosition(idx());
    get${name}Writer(arrowType).write${name}(value);
  }

  public void writeBigEndianBytesTo${name}(byte[] value, ArrowType arrowType) {
    data.setType(idx(), MinorType.${name?upper_case});
    get${name}Writer(arrowType).setPosition(idx());
    get${name}Writer(arrowType).writeBigEndianBytesTo${name}(value, arrowType);
  }
  <#elseif minor.class?ends_with("VarBinary")>
  @Override
  public void write${minor.class}(byte[] value) {
    get${name}Writer().setPosition(idx());
    get${name}Writer().write${minor.class}(value);
  }

  @Override
  public void write${minor.class}(byte[] value, int offset, int length) {
    get${name}Writer().setPosition(idx());
    get${name}Writer().write${minor.class}(value, offset, length);
  }

  @Override
  public void write${minor.class}(ByteBuffer value) {
    get${name}Writer().setPosition(idx());
    get${name}Writer().write${minor.class}(value);
  }

  @Override
  public void write${minor.class}(ByteBuffer value, int offset, int length) {
    get${name}Writer().setPosition(idx());
    get${name}Writer().write${minor.class}(value, offset, length);
  }
  <#elseif minor.class?ends_with("VarChar")>
  @Override
  public void write${minor.class}(${friendlyType} value) {
    get${name}Writer().setPosition(idx());
    get${name}Writer().write${minor.class}(value);
  }

  @Override
  public void write${minor.class}(String value) {
    get${name}Writer().setPosition(idx());
    get${name}Writer().write${minor.class}(value);
  }
  </#if>
      </#if>
    </#list>
  </#list>
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -



vector/src/main/codegen/templates/UnionWriter.java [255:394]:
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
  <#list vv.types as type>
    <#list type.minor as minor>
      <#assign name = minor.class?cap_first />
      <#assign fields = minor.fields!type.fields />
      <#assign uncappedName = name?uncap_first/>
      <#assign friendlyType = (minor.friendlyType!minor.boxedType!type.boxedType) />
      <#if !minor.typeParams?? || minor.class?starts_with("Decimal") || is_timestamp_tz(minor.class) || minor.class == "Duration" || minor.class == "FixedSizeBinary">

  private ${name}Writer ${name?uncap_first}Writer;

  <#if minor.class?starts_with("Decimal") || is_timestamp_tz(minor.class) || minor.class == "Duration" || minor.class == "FixedSizeBinary">
  private ${name}Writer get${name}Writer(ArrowType arrowType) {
    if (${uncappedName}Writer == null) {
      ${uncappedName}Writer = new ${name}WriterImpl(data.get${name}Vector(arrowType));
      ${uncappedName}Writer.setPosition(idx());
      writers.add(${uncappedName}Writer);
    }
    return ${uncappedName}Writer;
  }

  public ${name}Writer as${name}(ArrowType arrowType) {
    data.setType(idx(), MinorType.${name?upper_case});
    return get${name}Writer(arrowType);
  }
  <#else>
  private ${name}Writer get${name}Writer() {
    if (${uncappedName}Writer == null) {
      ${uncappedName}Writer = new ${name}WriterImpl(data.get${name}Vector());
      ${uncappedName}Writer.setPosition(idx());
      writers.add(${uncappedName}Writer);
    }
    return ${uncappedName}Writer;
  }

  public ${name}Writer as${name}() {
    data.setType(idx(), MinorType.${name?upper_case});
    return get${name}Writer();
  }
  </#if>

  @Override
  public void write(${name}Holder holder) {
    data.setType(idx(), MinorType.${name?upper_case});
    <#if minor.class?starts_with("Decimal")>
    ArrowType arrowType = new ArrowType.Decimal(holder.precision, holder.scale, ${name}Holder.WIDTH * 8);
    get${name}Writer(arrowType).setPosition(idx());
    get${name}Writer(arrowType).write${name}(<#list fields as field>holder.${field.name}<#if field_has_next>, </#if></#list>, arrowType);
    <#elseif is_timestamp_tz(minor.class)>
    ArrowType.Timestamp arrowTypeWithoutTz = (ArrowType.Timestamp) MinorType.${name?upper_case?remove_ending("TZ")}.getType();
    ArrowType arrowType = new ArrowType.Timestamp(arrowTypeWithoutTz.getUnit(), holder.timezone);
    get${name}Writer(arrowType).setPosition(idx());
    get${name}Writer(arrowType).write(holder);
    <#elseif minor.class == "Duration">
    ArrowType arrowType = new ArrowType.Duration(holder.unit);
    get${name}Writer(arrowType).setPosition(idx());
    get${name}Writer(arrowType).write(holder);
    <#elseif minor.class == "FixedSizeBinary">
    ArrowType arrowType = new ArrowType.FixedSizeBinary(holder.byteWidth);
    get${name}Writer(arrowType).setPosition(idx());
    get${name}Writer(arrowType).write(holder);
    <#else>
    get${name}Writer().setPosition(idx());
    get${name}Writer().write${name}(<#list fields as field>holder.${field.name}<#if field_has_next>, </#if></#list>);
    </#if>
  }

  public void write${minor.class}(<#list fields as field>${field.type} ${field.name}<#if field_has_next>, </#if></#list><#if minor.class?starts_with("Decimal")>, ArrowType arrowType</#if>) {
    data.setType(idx(), MinorType.${name?upper_case});
    <#if minor.class?starts_with("Decimal")>
    get${name}Writer(arrowType).setPosition(idx());
    get${name}Writer(arrowType).write${name}(<#list fields as field>${field.name}<#if field_has_next>, </#if></#list>, arrowType);
    <#elseif is_timestamp_tz(minor.class)>
    ArrowType.Timestamp arrowTypeWithoutTz = (ArrowType.Timestamp) MinorType.${name?upper_case?remove_ending("TZ")}.getType();
    ArrowType arrowType = new ArrowType.Timestamp(arrowTypeWithoutTz.getUnit(), "UTC");
    get${name}Writer(arrowType).setPosition(idx());
    get${name}Writer(arrowType).write${name}(<#list fields as field>${field.name}<#if field_has_next>, </#if></#list>);
    <#elseif minor.class == "Duration" || minor.class == "FixedSizeBinary">
    // This is expected to throw. There's nothing more that we can do here since we can't infer any
    // sort of default unit for the Duration or a default width for the FixedSizeBinary types.
    ArrowType arrowType = MinorType.${name?upper_case}.getType();
    get${name}Writer(arrowType).setPosition(idx());
    get${name}Writer(arrowType).write${name}(<#list fields as field>${field.name}<#if field_has_next>, </#if></#list>);
    <#else>
    get${name}Writer().setPosition(idx());
    get${name}Writer().write${name}(<#list fields as field>${field.name}<#if field_has_next>, </#if></#list>);
    </#if>
  }
  <#if minor.class?starts_with("Decimal")>
  public void write${name}(${friendlyType} value) {
    data.setType(idx(), MinorType.${name?upper_case});
    ArrowType arrowType = new ArrowType.Decimal(value.precision(), value.scale(), ${name}Vector.TYPE_WIDTH * 8);
    get${name}Writer(arrowType).setPosition(idx());
    get${name}Writer(arrowType).write${name}(value);
  }

  public void writeBigEndianBytesTo${name}(byte[] value, ArrowType arrowType) {
    data.setType(idx(), MinorType.${name?upper_case});
    get${name}Writer(arrowType).setPosition(idx());
    get${name}Writer(arrowType).writeBigEndianBytesTo${name}(value, arrowType);
  }
  <#elseif minor.class?ends_with("VarBinary")>
  @Override
  public void write${minor.class}(byte[] value) {
    get${name}Writer().setPosition(idx());
    get${name}Writer().write${minor.class}(value);
  }

  @Override
  public void write${minor.class}(byte[] value, int offset, int length) {
    get${name}Writer().setPosition(idx());
    get${name}Writer().write${minor.class}(value, offset, length);
  }

  @Override
  public void write${minor.class}(ByteBuffer value) {
    get${name}Writer().setPosition(idx());
    get${name}Writer().write${minor.class}(value);
  }

  @Override
  public void write${minor.class}(ByteBuffer value, int offset, int length) {
    get${name}Writer().setPosition(idx());
    get${name}Writer().write${minor.class}(value, offset, length);
  }
  <#elseif minor.class?ends_with("VarChar")>
  @Override
  public void write${minor.class}(${friendlyType} value) {
    get${name}Writer().setPosition(idx());
    get${name}Writer().write${minor.class}(value);
  }

  @Override
  public void write${minor.class}(String value) {
    get${name}Writer().setPosition(idx());
    get${name}Writer().write${minor.class}(value);
  }
  </#if>
      </#if>
    </#list>
  </#list>
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -