go: Field definition of parts other than name and type

php Xiaobian Yuzai introduces to you "go: field definitions of parts other than name and type". In the Go language, in addition to the name and type of the field, other attributes and labels can be defined for the field. You can control a field's visibility and access by adding properties to it. By adding tags to fields, you can add additional metadata to the fields to describe the characteristics of the fields. These field definitions can be used in structures, providing more flexibility and scalability for program design and implementation.

Question content

I saw this structure definition:

type Resource struct {
    Attrs []Attribute `parquet:",list"`
    ServiceName      string  `parquet:",snappy,dict"`
    Cluster          *string `parquet:",snappy,optional,dict"`
    ....
}

I understand the first two parts of the field definition (name, type). But what does that last part mean? like

parquet:",snappy,dict"

Workaround

Text in backticks describes Go structure tags that can be accessed via reflection (see reflect.StructTag for details).

These tags are typically used by codes that marshal/unmarshal into different formats - usually describing how a field should be decoded or encoded. Usage of the structure tag of encoding/json for the Marshal and Unmarshal functions.

Your example appears to be related to the github.com/segmentio/parquet-go package. It has some brief documentation on how the package interprets structure tags .

in particular:

• snappy Encode columns using Snappy compression
• dict Enable Dict encoded files using Parquet.
• OptionalIndicates that the Parquet column is optional.
• list indicates that the parquet LIST logical type should be used.

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