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From Matthias Boehm <mboe...@googlemail.com>
Subject Re: Operators in HOP DAG
Date Fri, 17 Feb 2017 20:01:06 GMT
ad 1: t(-*): ternary minus mult (for patterns like X-s*Y)

ad 2: ua(+RC): unary aggregate with aggregation function + (at runtime 
level you will see k+ for Kahan plus) and direction RC, i.e., full 
aggregate over rows and columns.

ad 3: lix: matrix or frame left indexing (for patterns like X[a:b,c:d] = 
...)

ad 4: u(cast_as_scalar): unary cast from matrix or frame to scalar of 
value type double.

Regards,
Matthias

On 2/17/2017 5:46 AM, Nantia Makrynioti wrote:
> Hello,
>
> I generated a HOP plan using -explain, but I can't find the meaning of the
> following operators:
>
>
>    1. t(-*)
>    2. ua(+RC)
>    3. lix
>    4. u(cast_as_scalar)
>
>
> Thank you in advance,
> Nantia
>

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