vector/src/main/codegen/templates/UnionViewWriter.java [95:118]:
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  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>
  }
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vector/src/main/codegen/templates/UnionWriter.java [296:319]:
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  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>
  }
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