Eric Hanson created HIVE-4822:
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Summary: implement vectorized math functions
Key: HIVE-4822
URL: https://issues.apache.org/jira/browse/HIVE-4822
Project: Hive
Issue Type: Sub-task
Affects Versions: vectorization-branch
Reporter: Eric Hanson
Implement vectorized support for the all the built-in math functions. This
includes implementing the vectorized operation, and tying it all together in
VectorizationContext so it runs end-to-end. These functions include:
round(Col)
Round(Col, N)
Floor(Col)
Ceil(Col)
Rand(), Rand(seed)
Exp(Col)
Ln(Col)
Log10(Col)
Log2(Col)
Log(base, Col)
Pow(col, p), Power(col, p)
Sqrt(Col)
Bin(Col)
Hex(Col)
Unhex(Col)
Conv(Col, from_base, to_base)
Abs(Col)
Pmod(arg1, arg2)
Sin(Col)
Asin(Col)
Cos(Col)
ACos(Col)
Atan(Col)
Degrees(Col)
Radians(Col)
Positive(Col)
Negative(Col)
Sign(Col)
E()
Pi()
To reduce the total code volume, do an implicit type cast from non-double input
types to double.
Also, POSITITVE and NEGATIVE are syntactic sugar for unary + and unary -, so
reuse code for those as appropriate.
Try to call the function directly in the inner loop and avoid new() or
expensive operations, as appropriate.
Templatize the code where appropriate, e.g. all the unary function of form
DOUBLE func(DOUBLE)
can probably be done with a template.
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