Re: Copying data from int column to array column - Mailing list pgsql-general

From Tom Lane
Subject Re: Copying data from int column to array column
Date
Msg-id 4099.1118248454@sss.pgh.pa.us
Whole thread Raw
In response to Copying data from int column to array column  (Adam Witney <awitney@sgul.ac.uk>)
List pgsql-general
Adam Witney <awitney@sgul.ac.uk> writes:
> UPDATE test SET field2 = field1;
> UPDATE test SET field3[1] = field1;

> Why does the UPDATE of field2 work, but the UPDATE of field3 does not?

Works for me in 8.0 ;-).  Before 8.0, if you tried to assign to just one
value of an array that was initially NULL, the array stayed NULL.

(That behavior made sense from the point of view of the implementation,
which sees array element assignment as a binary operation taking an
array and a new element value ... but it wasn't especially useful.)

            regards, tom lane

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