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From "Marcel Silberhorn (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (AVRO-1803) nullable fields and it's default value
Date Wed, 24 Feb 2016 12:23:18 GMT

     [ https://issues.apache.org/jira/browse/AVRO-1803?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Marcel Silberhorn updated AVRO-1803:
------------------------------------
    Description: 
as described in
https://avro.apache.org/docs/current/spec.html
{quote}h6. Unions

Unions, as mentioned above, are represented using JSON arrays. For example, {{\["null", "string"\]}}
declares a schema which may be either a null or string.

(Note that when a default value is specified for a record field whose type is a union, the
type of the default value must match the +first+ element of the union. Thus, for unions containing
"null", the "null" is usually listed first, since the default value of such unions is typically
null.){quote}

and the given example for Handshake with
{code}
{"name": "clientProtocol", "type": ["null", "string"]},
{code}

or even the "tweet.hashtags" example from http://stackoverflow.com/questions/31864450

as seen in http://stackoverflow.com/questions/9417732 you have to explicit define the {{"default":
null}} for the "nullable union field", else you get

{{Field clientProtocol type:UNION pos:0 not set and has no default value}}

so either there is a bug in the documentation or in the code ,)

If its "just" a documentation error, please decrease this bug to a wish: add some compiler
warnings when using union without default value

  was:
as described in
https://avro.apache.org/docs/current/spec.html
{quote}h6. Unions

Unions, as mentioned above, are represented using JSON arrays. For example, {{\["null", "string"\]}}
declares a schema which may be either a null or string.

(Note that when a default value is specified for a record field whose type is a union, the
type of the default value must match the +first+ element of the union. Thus, for unions containing
"null", the "null" is usually listed first, since the default value of such unions is typically
null.){quote}

and the given example for Handshake with
{code}
{"name": "clientProtocol", "type": ["null", "string"]},
{code}

or even the "tweet.hashtags" example from http://stackoverflow.com/questions/31864450

as seen in http://stackoverflow.com/questions/9417732 you have to explicit define the {{"default":
null}} for the "nullable union field", else you get

{{Field clientProtocol type:UNION pos:0 not set and has no default value}}

so either there is a bug in the documentation or in the code ,)


> nullable fields and it's default value
> --------------------------------------
>
>                 Key: AVRO-1803
>                 URL: https://issues.apache.org/jira/browse/AVRO-1803
>             Project: Avro
>          Issue Type: Bug
>          Components: build
>    Affects Versions: 1.7.7, 1.8.0
>            Reporter: Marcel Silberhorn
>            Priority: Minor
>
> as described in
> https://avro.apache.org/docs/current/spec.html
> {quote}h6. Unions
> Unions, as mentioned above, are represented using JSON arrays. For example, {{\["null",
"string"\]}} declares a schema which may be either a null or string.
> (Note that when a default value is specified for a record field whose type is a union,
the type of the default value must match the +first+ element of the union. Thus, for unions
containing "null", the "null" is usually listed first, since the default value of such unions
is typically null.){quote}
> and the given example for Handshake with
> {code}
> {"name": "clientProtocol", "type": ["null", "string"]},
> {code}
> or even the "tweet.hashtags" example from http://stackoverflow.com/questions/31864450
> as seen in http://stackoverflow.com/questions/9417732 you have to explicit define the
{{"default": null}} for the "nullable union field", else you get
> {{Field clientProtocol type:UNION pos:0 not set and has no default value}}
> so either there is a bug in the documentation or in the code ,)
> If its "just" a documentation error, please decrease this bug to a wish: add some compiler
warnings when using union without default value



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