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Date: Sun, 20 Oct 2013 13:28:28 -0700
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 <CALEq1Z-XZT5F0HWnbaBMEeCvnX=dyeA2ALb39hwC67sBQ0YPjw@mail.gmail.com>
Subject: Re: default values
From: Doug Cutting <cutting@apache.org>
To: user@avro.apache.org
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Note that builders do supply defaults.

http://avro.apache.org/docs/current/api/java/org/apache/avro/data/RecordBuilder.html

But that might not help you much here.

You might intersect your config json with the reader schema to determine
its implied writer schema.

Doug
On Oct 13, 2013 9:21 PM, "Koert Kuipers" <koert@tresata.com> wrote:

> i am testing parsing a json string using a record class defined in an
> .avdl file.
>
> i was hoping that if a field in the record has a default value that it is
> not mandatory to provide it in the json. however i get an exception:
>
> org.apache.avro.AvroTypeException: Expected field name not found: test123
>
> i guess it was silly of me to expect this?
> are default values only used in schema resolution (so reader vs writer
> schema)? and in this case there is no writer schema, just json data i
> created and a reader schema, so the default values will not help me?
>
> too bad because this seemed like a really quick and convenient way to
> create configuration objects that can be instantiated from json, but
> without "optional" fields with default values it loses a lot of it power.
>
>

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<p dir=3D"ltr">Note that builders do supply defaults.</p>
<p dir=3D"ltr"><a href=3D"http://avro.apache.org/docs/current/api/java/org/=
apache/avro/data/RecordBuilder.html">http://avro.apache.org/docs/current/ap=
i/java/org/apache/avro/data/RecordBuilder.html</a></p>
<p dir=3D"ltr">But that might not help you much here.</p>
<p dir=3D"ltr">You might intersect your config json with the reader schema =
to determine its implied writer schema.</p>
<p dir=3D"ltr">Doug</p>
<div class=3D"gmail_quote">On Oct 13, 2013 9:21 PM, &quot;Koert Kuipers&quo=
t; &lt;<a href=3D"mailto:koert@tresata.com">koert@tresata.com</a>&gt; wrote=
:<br type=3D"attribution"><blockquote class=3D"gmail_quote" style=3D"margin=
:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div dir=3D"ltr"><div class=3D"gmail_default" style=3D"font-family:courier =
new,monospace">i am testing parsing a json string using a record class defi=
ned in an .avdl file.<br><br></div><div class=3D"gmail_default" style=3D"fo=
nt-family:courier new,monospace">

i was hoping that if a field in the record has a default value that it is n=
ot mandatory to provide it in the json. however i get an exception:<br><br>=
org.apache.avro.AvroTypeException: Expected field name not found: test123<b=
r>

<br></div><div class=3D"gmail_default" style=3D"font-family:courier new,mon=
ospace">i guess it was silly of me to expect this? <br>are default values o=
nly used in schema resolution (so reader vs writer schema)? and in this cas=
e there is no writer schema, just json data i created and a reader schema, =
so the default values will not help me?<br>

</div><div class=3D"gmail_default" style=3D"font-family:courier new,monospa=
ce"><br></div><div class=3D"gmail_default" style=3D"font-family:courier new=
,monospace">too bad because this seemed like a really quick and convenient =
way to create configuration objects that can be instantiated from json, but=
 without &quot;optional&quot; fields with default values it loses a lot of =
it power.<br>

</div><div class=3D"gmail_default" style=3D"font-family:courier new,monospa=
ce"><br></div></div>
</blockquote></div>

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