From: | Albrecht Dreß <albrecht(dot)dress(at)posteo(dot)de> |
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To: | pgsql-general(at)lists(dot)postgresql(dot)org |
Subject: | Passing enum Parameters to User-defined C-Language Functions |
Date: | 2023-10-23 16:54:28 |
Message-ID: | YPWPMG2B.7BAKC2P6.OUTXXAKJ@5ZHNMZGJ.ZUSHUKV4.TDKUFKXK |
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Lists: | pgsql-general |
Hi,
I have a (I hope not too dumb) question regarding the use of enum parameters in a user-defined function written in C, e.g. for the example given in [1]: CREATE TYPE mood AS ENUM ('sad', 'ok', 'happy');
- How would a “mood” parameter be encoded when it is passed to the function? “Four bytes on disk” might imply that its either an int4 or a float4?
- How is the association between enumlabel (e.g. 'happy') and value? The same as enumsortorder in pg_enum?
- How are NULL values encoded?
Or is it a bad idea to use an enum in this case – actually, an int2 plus a few #define's would do the job, too, but the dedicated type looks cleaner to me.
Thanks in advance,
Albrecht.
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