[Tarantool-discussions] Implicit cast for ASSIGNMENT

Konstantin Osipov kostja.osipov at gmail.com
Thu Apr 30 15:35:00 MSK 2020

* Imeev Mergen <imeevma at tarantool.org> [20/04/30 15:13]:
> Hi! Here we go again. Last time we have not come to a colclusion.
> So, I suggest these rules for implicit cast for ASSIGNMENT:
> 1) Any value can be implicitly cast to ANY type.
> 2) Any scalar values ​​can be implicitly cast to SCALAR type.
> 3) Values ​​of numeric types can be implicitly cast to other numeric
> types.

SQL is strictly typed, there should be no implicit conversions
between numeric types.

The only possible exception is conversion of a lossless conversion
of a numeric literal, e.g.:

float_val = 1.1 -- implicitly convert decimal constant 1.1 to float

> 4) Implicit casting is prohibited, except as described above.
> I think that the rules for implicit casting when assigning value
> of numeric type must be the same as in C.


Konstantin Osipov, Moscow, Russia

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